ATI AT1820 Series Class-AB Power Amplifier Owner’s Manual

ATI AT1820 Series Class-AB Power Amplifier Owner’s Manual

PLEASE READ FIRST

CAUTION: To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable parts inside.
Refer servicing to qualified service personnel.

WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture.

The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electrical shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operation maintenance (servicing) instructions in the literature accompanying the appliance.

California Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm. (California law requires this warning to be given to customers in the State of California.)

PRECAUTIONS

The AT1820 amplifier is a wide-band design with substantial power output capability. Certain precautions must be taken to ensure proper operation.

1. Never expose the amplifier to moisture.
2. Never plug an input cable into the amplifier while the unit is turned on.
3. Never apply the “thumb test” (touching the “hot” lead of the input cable with your finger) to the tip of the input cable or input jack of the ATI amplifier. RF rectification and/or hum will be created and could cause damage to the loudspeakers. ATI will not be responsible for damage to the loudspeakers due to improper use of the equipment.
4. Under no circumstances should the output terminals of the AT1820 be short-circuited.
5. Avoid restricting the airflow around the AT1820 amplifier. Good airflow is necessary to ensure proper cooling and trouble-free operation.
6. Ensure that the rated power handling of the loudspeakers connected to the AT1820 amplifier can handle the output power of the amplifier. The warranty of the AT1820 does not cover damage to loudspeakers with inadequate power handling capability.
7. Do not stack other system components or any other materials on top of the AT1820 amplifier. The amplifier is convection cooled and air must be free to circulate around its chassis.

SAFETY INSTRUCTIONS

Read all the safety and operating instructions before connection or using the AT1820 amplifier.

All warnings on the unit and in this operating manual should be adhered to.

All operating and use instructions should be followed.

Do not place/use the unit near water; for example, near a bathtub, washbowl/sink, laundry tub, decorative water features (waterfalls/fountains), in a wet basement or near a swimming pool.

This unit is not intended for outdoor use.

This unit should be installed so that its location or position does not interfere with its proper ventilation. For example, it should not be situated on a bed, sofa, rug or similar surface that may block its ventilation openings. It should also not be placed in a built-in enclosure, such as bookcase or cabinet, that may impede the flow of air through its ventilation openings.

The unit should be situated away from heat sources such as radiators, fireplaces, hot air ducts, heat registers, stoves and/ or other devices (including amplifiers) that produce heat.

The unit should be connected to a power-supply outlet only of the voltage and frequency marked on its rear panel.

The AC power cord should be routed so that it is not likely to be walked on or pinched, especially near the plug, convenience receptacles or where the cord exits from the unit.

Clean the unit only as recommended in this instruction manual.

The unit’s AC power cord should be unplugged from the wall outlet when the unit is to be unused for a long period of time.

Care should be taken so that objects do not fall, and liquids are not spilled, into the unit through any openings.

The unit should be serviced by qualified service personnel only when:

1. The power cord or plug has been damaged; or
2. Objects have fallen, or liquid has been spilled, into the unit; or
3. The unit has been exposed to rain or liquids of any kind; or
4. The unit does not appear to operate normally or exhibits a marked change in performance; or
5. The device has been dropped or the enclosure damaged.

To prevent electric shock, do not use a ground lift plug/ adapter. Also, do not use the polarized plug with an extension cord, receptacle or other outlet unless all the blades can be fully inserted to prevent blade exposure.

Amplifier Identification Record

This information is for your records and for future identification of the AT1820. Please take a moment to fill out all pertinent data now. Whenever inquiries and/or repairs are requested, the serial number will be required.

MODEL NUMBER: ____
SERIAL NUMBER: ____
DATE PURCHASED: ____
DEALER’S NAME: ____
DEALER’S ADDRESS/PHONE: ____

AT1820 Series Power Amplifiers

Congratulations! Thank you for purchasing an ATI AT1820 Power Amplifier, one of the most advanced audio components available. Designed, engineered and assembled in the United States, it has been carefully designed and tested to deliver the best possible audiophile-grade performance as well as the most reliable operation.

The AT1820 Series is comprised of six models; the last digit in the model number is the number of channels in the amplifier. This manual covers all six models.

In order to receive the maximum performance from your new amplifier, please take a few minutes to read this manual. This important information will help you make certain that the amplifier is properly configured for operation with the rest of the equipment in your system.

If you have any questions about this product, its installation or operation, please contact us via e-mail at support@ati-amp.com or via telephone at 323 278-0001.

Features and Testing

Your AT1820 amplifier was designed to provide a state-of-the-art listening experience and is suitable for use with associated components of the highest order. The amplifier uses an updated version of the AT1800 amplifier modules with new circuitry to add the XLR inputs. Each module includes an ATI designed custom gain stage and linear power supply to deliver superior performance.

Additional features include:

• Custom soft-start circuitry to minimize any turn-on power surge;
• Complete protection from overload, DC faults, over-voltage or over-temperature conditions.
• Extruded aluminum heatsinks to aid in cooling the amplifier modules.

This AT1820 amplifier has been put through a rigorous and unique testing procedure ensuring that each amplifier will last for many years with minimal service requirements. This procedure includes the following:

• All assembled circuit boards are given a thorough visual inspection and are then performance tested.
• The tested, assembled circuit boards are then installed in a new AT1820 and the whole unit is tested for every function and parameter.
• The unit is put on a burn-in torture rack to test for any possible component failures.
• The amplifier then undergoes a critical listening and final functional test.

Unpacking

Your amplifier is a precision electronic instrument and should be properly packaged any time shipment is made. The carton and packing materials used in shipping your new amplifier were specially designed to protect it from the shock and vibration of shipping. We strongly suggest that you save the carton and packing materials to use if you move, or if the unit ever needs to be shipped back to us for any reason. Should you discover that your amplifier has been damaged during shipping, please contact your dealer or ATI immediately and request the name of the carrier so a written claim may be made.

THE RIGHT TO A CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NOT NOTIFIED PROMPTLY IN WRITING AND IF THE SHIPPING CARTON AND PACKING MATERIALS ARE NOT AVAILABLE FOR INSPECTION BY THE CARRIER. SAVE ALL PACKING MATERIALS UNTIL THE CLAIM IS SETTLED.

Placement

During normal home operation the heat sinks on the amplifier will become warm. However, there are instances during high level playback into low impedance speakers when the heat sinks will become warmer than usual. To ensure the amplifier’s trouble-free operation, it is necessary to provide adequate ventilation for the heat sinks. Your amplifier should be kept away from external sources of heat such as radiators and hot-air ducts. The amplifier should never be placed with other heat-producing components in a cabinet or enclosure lacking free airflow. Do not stack other components on top of your amplifier.

Note: It is imperative that the amplifier be operated in a well- ventilated environment and that the immediate external temperature be maintained as specified.

Rack Mounting

The AT1820 Series amplifiers can be rack mounted into a standard 19-inch rack with the addition of rack ears. The kits are available separately for an additional charge and include instructions and hardware for proper mounting of the parts to the amplifier.

To order, call your dealer or ATI and order SKU # / Model “AT1820 RKM”.

Owner’s Guide Conventions

For clarity purposes, references to buttons and LED’s will be shown in bold capital letters.

Front Panel Layout

1. ATI LOGO.
2. ILLUMINATED POWER SWITCH. When the amplifier is plugged in and idle, the ILLUMINATED POWER SWITCH is off. When the ILLUMINATED POWER SWITCH is depressed, the illumination of the switch becomes constant and the amplifier begins the turn-on process.
   When the turn-on process is complete, the ILLUMINATED POWER SWITCH brightens fully

Rear Panel Layout

• A. Balanced (XLR) Audio Inputs
  Use the BALANCED INPUT jacks to connect to the outputs of a preamplifier or other control device with XLR outputs. The XLR jack is wired Pin 1 – Ground, Pin 2 – Hot, and Pin 3 – Cold.

• B. Unbalanced (RCA) Audio Inputs
  Use the UNBALANCED INPUT jacks to connect to the outputs of a preamplifier, receiver with preampout connections, CD player, or other source device with RCA style outputs.

• C. Input Selector Switch
  Selects either the BALANCED INPUT (XLR) or the UNBALANCED (RCA) INPUT jack.

• D. Remote Trigger Input
  Use the REMOTE TRIGGER jack to connect to a compatible preamplifier, source device, or other product with a 3.3-24 VDC output.

• E. Chassis Ground Terminal
  Use to connect to other chassis where necessary.

• F. Circuit Breaker / Main Power Switch

• G. AC Inlet
  Use the included power cord to connect your amplifier to an AC power source.

• H. Speaker Outputs
  Use the OUTPUT binding posts to connect the amplifier to your speakers. The post with the red accents is positive. The post with the black accents is negative.

• I. Channel Name Label
  ATI provided labels that use standard speaker location names to mark the amp and wires to make install and debugging easier.

• J. Power Configuration Label
  Calls out AC voltage and frequency, power consumption and circuit breaker trip current.

Amplifier Channel To Speaker Map

Connecting Your Amplifier

When making connections between any source components and the amplifier, or when making connections to any speaker, be certain that both the input devices and the amplifier are turned off. To assure that there will be no unwanted signal transients that can damage equipment or speakers, it is always best to unplug all equipment before making any connections.

Input Connections

Connecting the amplifier to your source equipment is simple. Using high- quality audio interconnect cables, match the output channel designations on the rear of your source equipment to the input jacks on the rear panel of your amplifier that have the same channel name. The AT1820 amplifiers have both XLR and RCA input connections on the rear panel. Use the toggle switch to the right of each RCA jack to select the desired input for each channel. When making connections with RCA type plugs on interconnect cables, make certain to gently, but firmly, insert the plug into the jack. Loose connections can cause intermittent sound and may damage your speakers. Some quality RCA plugs may be very tight, and it is important to assure a proper connection between the interconnection cable and the input jack.

Speaker Connections

To assure that the high quality signals produced by your amplifier are carried to your speakers without loss of clarity or resolution, we recommend that you use high quality speaker wire. Many brands of wire are available; the choice may be influenced by the distance between your speakers and the amplifier, the type of speakers you use, personal preferences, or other factors.

Regardless of the brand or type of speaker wire selected, we recommend that you use a wire constructed of fine, multi-strand copper with a gauge of 14 or less. In specifying wire, the lower the number, the thicker the cable. Wire with a gauge of 16 may be used for short runs of less than twenty feet. We do not recommend that you use any wires with an AWG equivalent of 18 or higher due to the power loss and degradation in performance that will occur.

To connect the amplifier to your speakers, a pair of binding posts is provided for each channel output.
These posts will accept bare wire, spade lugs or banana type plugs. If bare wire is used for the connections, strip approximately 1/2 inch to 3/4 inch of insulation from the end of each wire and carefully twist the strands of each conductor together. Be careful not to cut the individual strands or twist them off. All strands must be used for optimal performance.

Correct polarity of connections are important to maintain proper speaker phasing. When speaker phasing is correct, all speakers move in and out at the same time, preserving the imaging of the program material. Out-of-phase connections mean that some speaker cones will be moving in, while others move out. This will cause indistinct or confused imaging, and muddled and cloudy sounds. To avoid incorrect phasing or polarity, be certain to use wire that has distinct markings, colors, stripes, wording, or grooves on each side of the speaker cable. When making connections to the amp and speakers, adhere to a consistent pattern of using one side of the wire to the red terminals and the other side to the black terminals. When using cable with markings on one side only, traditional convention is to consider the marked side of the wire as the red, or positive (+) connection, and the non marked side as the black or negative (–) connection.

Next, loosen the knobs of the amplifier’s speaker output terminals, far enough so that the pass through hole is revealed. Follow the proper connection instructions for your system with regard to which terminals are used. Once the connections are made, twist the cap back so that the connection is secured, but do not over tighten or use tools, as this may break the delicate wire strands and decrease system performance.

If you are using spade lugs, connect them to the speaker wire using the manufacturer’s instructions, and then loosen the caps on the speaker terminals. Place lugs between the plastic cap and the back of the terminal. Be sure to observe proper polarity, using the appropriate speaker hook-up icons for your system’s configuration.
Using your fingers, tighten to obtain a positive contact.

When using banana plugs, connections may be made by simply inserting the jack affixed to your speaker wire into the hole provided on the rear of the colored screw caps on the binding posts. Before using banana type jacks, make certain that the plastic screw caps are firmly tightened down by turning them in a clockwise direction until they are snug against the chassis. This will insure that the maximum surface area of the plug is in contact with the jack. Be certain to observe proper polarity.

Run the cables to the speaker locations. Do not coil any excess cable, as this may become an inductor that creates frequency response variations in your system. Finally, connect the wires to the speakers, again being certain to observe proper polarity. Remember to connect your negative, or black wire, to the matching terminal on the speaker. The positive, or red wire, should be connected to the matching terminal on the speaker.

NOTE: While most speaker manufacturers adhere to an industry convention of using red terminals for positive connections and black terminals for negative, some manufacturers may vary from this configuration. To assure proper phase connections, and optimal performance, consult the identification plate on your speaker terminals, or the speaker’s manual to verify polarity. If you do not know the polarity of your speaker, consult the speaker’s manufacturer for further information.

Power Control Connections

Your amplifier features a built-in remote turn-on system that will automatically switch the amplifier on when another device in the system is switched on.

Remote Turn-On Using Products
Equipped With a Low Voltage Trigger Jack
Press the front panel power switch on the amplifier so that it is in the ON position. Then, using an accessory cable with a 3.5mm mono mini-plug on each end, connect the trigger-output jack on the rear of the source device to the trigger input jack on the back panel of the amplifier. When these connections are made, the amplifier will automatically turn on and off with the triggering device. The trigger is compatible with a 3 – 24 VDC steady state signal.

Remote Turn-On
Using External AC to DC Power Converter
If your source device does not have a dedicated trigger jack, it is still possible to activate the unit for automatic turn on when a Switched Outlet is available on the rear of the source device. To control the amplifier in this fashion, you will need a small AC to DC power converter, capable of delivering a 3.3 to 24 volt DC signal.

The DC voltage should terminate in a standard 3.5mm type mini plug. This type of converter may be obtained as a Power Adapter from many electronics retailers.

When installing, press the Main Power Switch on the front panel of the amplifier in so that it is in the ON position. Plug the AC adapter into a switched outlet on the source device that will be activated when you wish to have the amplifier turn on. This may be the switched outlet at the rear of an AC receiver or other audio equipment. Connect the 3.5mm mini-plug from the adapter to the trigger-input jack on the back panel of the amplifier. The amplifier will now turn on and off automatically, based on the status of the controlling device.

Power Connection

Once all audio and system connections have been made, connect the supplied power cord to the amplifier first, and then connect it to an AC power source. Please make certain that the amplifier is turned off and that the device connected to the remote trigger input is off when connecting the power cord and plugging it into an AC outlet.

When the power cord is plugged into the wall outlet, and the main power switch / circuit breaker is in the on position, the amplifier is in the standby mode and draws less than 1 watt from the wall outlet.

CAUTION: Do not plug the amplifier directly into the “Switched Accessory” outlet of another device! These outlets are intended for use with low current draw products having a low current draw, such as tuners, CD players or cassette decks. These cannot handle the high current draw of a power amplifier. Using these outlets for a power amplifier is a significant safety hazard.

NOTE: It is not recommended that you connect other power amplifiers, or products with a high current draw, to the same AC power circuit as the amplifier. If this is unavoidable, the Ultra-Soft-Start circuitry of your amp will prevent excessively high inrush current.

Amplifier Operation

Before turning on the AT1820, ensure that all precautions and warnings have been carefully reviewed and adhered to. Damage to the amplifier caused by improper operation, wiring and/or ventilation will not be covered under warranty and ATI will not be liable for any consequential damage or loss.

After all connections have been made you are ready for operation. First, turn on the source components and processor in your system. It is always a good idea to turn on your amplifier LAST. This avoids the possibility of any turn on pops or transients from other equipment being amplified and sent to your speakers where they may cause damage. Always start with a low volume level on your controller or preamp to avoid damage to your speakers.

Manual On

Simply press the front panel power switch. The switch will dimly light up during the soft-start sequence. There will be a couple clicks from the chassis, this is normal.
These are relays activating to pass AC to the large power transformers. After the turn-on process is complete, the front panel switch will illuminate fully. During the soft-start sequence audio will pass through the amplifier modules, but full power will not be available. To turn the unit off, press the Power button again.

NOTE: We recommend not playing audio during the turn-on soft-start sequence.

Automatic On

Make certain that the connection to the controlling device is correct.
Whenever the controlling device is turned on, the amplifier will automatically turn on. You may also hear a relay click as during start up. This is also normal.

To turn off your amplifier, simply turn off the device feeding the amplifier it’s trigger signal. The amplifier will automatically go into a standby mode in a few moments.

AC Line Connector and Power Cord

Your amplifier is supplied with an internationally approved (IEC) power line connector that accepts the supplied detachable, high-current capacity power cord.

WARNING: Under no circumstances should the round third prong on the plug be cut, bent or in any other way defeated as this may result in severe shock.

WARNING: Always turn off the amplifier and unplug the power cord before making any electrical connections.

ATI Service Information

The AT1820 series does not contain any user serviceable parts inside. If you suspect a problem that may require service assistance, contact us at support@atiamp.com, or by phone at 323-278-0001. It is important that only an authorized service agent carry out any repairs. This will assure proper service and preserve the protection of your Limited Warranty. Keep your sales slip or receipt in a safe place with this manual so that it will be available to verify the purchase date, should you experience a problem covered by out warranty.

Care and Maintenance

Cleaning

When the unit becomes dirty, wipe it with a clean, soft, dry cloth. If necessary, first wipe the surface with a soft cloth slightly dampened with a mild soapy water, then with a fresh cloth dampened with clean water. Wipe dry immediately with a dry cloth. Never use benzene, thinner, alcohol or any other volatile cleaning agent. Do not use abrasive cleaners, as they will damage the finished of the metal parts. Avoid spraying insecticide, waxes, polishing agents, or any aerosol product near the unit. A Few Words About Hum and Noise

Audible hum, or a discernable low frequency noise, is one of the most common problems in audio/video systems. This hum, which may be present even when the volume is at a low level, is usually caused by a problem known as “ground loops”. A ground loop occurs when there is a difference in ground voltages between two or more components that are connected electrically. This, in turn, creates multiple current paths and causes the low-level noise, or hum.

The growing sophistication and complexity of home audio/video systems, and the increased number of components used to create these systems has dramatically increased the potential for the possibility of ground loops. While it is natural to suspect that the components in your system are the cause of the hum, in many cases the cause may be due to other conditions. In particular, cable TV connections from outside the house have become a major source of hum.

In most cases, one of the following suggestions should help you to solve a hum problem in your system. Please try these steps in the sequence shown, proceeding from one step to the next if the prior suggestion does not eliminate the problem.

Potential Ground Loops in a Complex A/V System

Suggestion #1:

To determine if a cable TV connection is responsible for the hum, first turn all components off. Disconnect the cable TV feed to your system at the first place where it connects to your components. Alternatively, disconnect the cable TV wire where it is connected at the wall outlet. Turn your system back on, and listen if the hum has disappeared. If removing the cable TV feed has eliminated the hum, you will need to insert a Ground Loop Isolator before reconnecting the cable TV feed, or contact your cable TV operator to see if they can better isolate your cable feed.

Suggestion #2:

Turn off all components in your system, and then disconnect the input cables at the amplifier. Turn the amplifier back on, and see if the hum is still present. If the hum disappears, the fault may be in the input cables used. Try replacing them with cables that have better shielding, and make certain that the input cables are not running on top of any AC power cords. Change the cables one at a time to determine if one, or all cables is responsive. If the hum disappears when the input cables are disconnected, but returns after the cables are changed and the system re-connected, the problem may be caused by your source device.

Suggestion #3:

Ground loop problems may also be caused by poor grounding of the electrical system in your home, particularly when there are multiple components with three prong, grounded, power cords. Try unplugging these components one at a time, and see if one or all of them is causing the problem. The ultimate solution to this type of problem is to re-wire your house with an isolated, star type-grounding configuration. We recognize, however, that this may be impractical and expensive. In some cases, the use of an approved AC Power Isolation Transformer of sufficient capacity may solve this problem.

WARNING: If you suspect that the grounding system in your home’s electrical wiring is causing the hum problem, it is important that you do not make any changes to the wiring yourself. Only a licensed electrician should make any changes to household wiring, and they must be made in full compliance with all local building, safety and electrical codes.

Suggestion #4:

Hum may also be caused by faulty earth grounds in your home’s electrical system. In the past, cold water pipes were often used for the earth ground, so it is important to make sure that your ground connection is still valid and has not become loose or corroded. The cold water pipe method may no longer be valid in some locations due to requirements that the water meter be isolated from the water mains with a length of PVC pipe, thus interrupting the ground circuit. The safest, and most reliable, approach may be to provide your own ground. This can be accomplished by having a licensed electrician drive at least five feet of copper jacketed steel grounding rod into the earth, and using that for your grounding connection. If the hum persists after all of the above suggestions have been tried, contact the ATI customer service department for assistance.

Appendix A – Troubleshooting Guide

Your ATI amplifier is designed for trouble free operation. If you follow the instructions in this manual you should enjoy many years of high quality listening enjoyment. However, as with any sophisticated electronic device, there may be occasional problems upon initial installation, or during the life of the unit. The items on the list below are a brief guide to the minor problems that you may be able to correct yourself. Please be sure to thoroughly check all other connected components such as speakers and preamplifiers, as well as cables. If the problem persists, please consult your installer, dealer, distributor or us for assistance.

amplifier and that the wall outlet is active.
No power or front panel lights| Circuit breaker is open (AC wall outlet)| Check the AC outlet circuit breaker and reset, if necessary, or contact your dealer.
No power or front panel lights| Chassis breaker is open (Amplifier power switch)| Check the rear panel circuit breaker and make sure it is in the on position. If the circuit breaker does not stay in the on position, contact ATI for support.
Amplifier will not turn on or off when a trigger cable is connected.| Improper wiring of remote trigger| Check voltage , polarity and connection of trigger wire.
Amplifier turns on, but there is no audio from one or more channels.| Input cables are not connected to proper jack or are loose.| Check all input connections.
Amplifier turns on, but there is no audio from one or more channels.| Input select switches are in the wrong position.| Check all input select switches and make sure they are in the correct position for the connection type, XLR or RCA
Amplifier turns on, but there is no audio from one or more channels.| Speakers are not connected properly.| Check speaker connections at the amplifier and speaker.
Audio levels differ.| Improper settings or output levels from processor or controller.| Check the settings on you preamp, processor or controller.
No audio output| Overheating, DC at output, Cata- strophic failure| The amplifier will turn off. For any but a catastrophic failure, the amplifier can be reset by removing the fault and completing the turn-on sequence again.

Appendix B – Model Circuit Breaker Ratings

All models use medium time delay hydraulic-magnetic circuit breakers. Please contact ATI customer service if you need more information.

Appendix C – Specifications

(Specifications subject to change without notice)

Analog Audio Inputs| One Single-ended (RCA) jack per channel & One Balanced (XLR) jack per channel
---|---
Slide Switch to choose jack
Input Impedance| 28 kΩ Nominal
Input Sensitivity| 1.6 Volts for rated power
Into 8 ohms
Gain| 28dB
Polarity| (Single-Ended) Non-Inverting
Balanced; Pin-2 = Positive, Pin-3 = Negative for Non-Inverting Output
Speaker Output| Binding posts; 1 pair per channel
| Standby: Amplifier is ready to be turned on via front panel switch or remote trigger.
Mode / Process| Overcurrent, D.C., and/or thermal protection: Amplifier will cycle.
| Catastrophic D.C. or output stage failure: Amplifier will shut down.
Power Output – 8 ohms
Per Channel|
20 Hz-20 kHz, < 0.03% THD| 200W
1 kHz, 0.005% THD, (Watts)| 250W
Power Output – 4 ohms
Per Channel|
20 Hz-20 kHz, < 0.075% THD| 300W
1 kHz, 0.015% THD, (Watts)| 375W
Distortion – 8 ohms
THD + N, 20 Hz – 20 kHz| < 0.03%
THD + N @ 1 kHz, 1W| < 0.005%
Intermodulation Distortion| Less than 0.03%
(SMPTE or Twin-tone)
Frequency Response| +0, -.5 dB, 5 Hz to 20 kHz, load independent
Damping Factor – 8Ω load| > 400 from 10Hz to 400Hz
Signal to Noise Ratio| > 120dB (A-Weighted – Ref. 8Ω FTC Power)
Slew Rate| > 50V / µS
Crosstalk| > -100dB from 20Hz – 20kHz
Trigger Input| 3.3-24 VDC; Steady State Tip Positive
Dimensions (W x H x D)
AT1827, AT1826, AT1825| 17” x 7 3/4” x 17 5/8” (432 mm x 196 mm x 448 mm)
AT1824, AT1823, AT1822| 17” x 7 3/4” x 14 5/8” (432 mm x 196 mm x 372 mm)
Weight (lbs. / kg)| AT1827: Amp – 95.2 / 43.3 , Shipping – 107 / 48.6 AT1826:
AT1825: Amp – 77 / 35 , Shipping – 92 / 41.8
AT1824:
AT1823: Amp – 52.1 / 23.7 , Shipping – 58 / 26.4
AT1822: Amp – 44.25 / 20.1 , Shipping – 51 / 23.2

Appendix D – Power Requirements & Consumption1

Factory Configured
Power Consumption| Less than 1W at Standby; 1800W maximum
| AT1822| AT1823| AT1824| AT1825| AT1826| AT1827 5
---|---|---|---|---|---|---
Standby|  |  | <1 Watts| |
Idle 2| 45W| 65W|  | 110W|  | 150W
@ Rated Power (8Ω)
All Channels unless noted| 7.65A
925VA
665W| 11.2A3
1350VA
990W|  | 17.5A3
2110VA
1610W|  | 11.4A3
2675VA
2150W

Appendix E – Thermal Dissipation¹

Duty Cycle| AT1822| AT1823| AT1824| AT1825| AT1826| AT1827 5
---|---|---|---|---|---|---
Idle| 160| 225|  | 380|  | 515
10% (Continuous Speech)| 250| 360|  | 590|  | 775
20% (Background Music)| 350| 500|  | 800|  | 1025
30% (Rock ‘N’ Roll)| 425| 625|  | 1000|  | 1285
40% (Compressed Rock Music)| 525| 760|  | 1210|  | 1540
50% (Pink Noise)| 610| 900|  | 1425|  | 1800

1. All measurements taken at the 120VAC line voltage, unless noted. For 240VAC line voltage, current draw will be ~0.5X the currents listed in the table. Measurements taken while driving amplifier channels with 1kHz sine wave into 8Ω resistive loads.
2. Nominal reading, ±5W.
3. We do not recommend running the amplifiers for extended periods of time over the fuse rating. This was done for testing purposes only.
4. All channels driven at 200W per channel
5. Amplifier configured for 240VAC line voltage. Power measurements taken at 240VAC line voltage.

Errors and Omissions Statement

ATI is not responsible for errors and omissions.
All product specifications are subject to change without notice.
Listed specifications and features are valid on the day of publication of this manual.
All trademarks are the properties of their respective owners

90-Day Limited Warranty Terms and Conditions

(7-Year Optional Extended Warranty)

This ATI product is warranted against defects in materials and workmanship for a period of 90 days from the date of purchase by the original owner. The date of purchase shall be established by the original owner presenting to the ATI Customer Service Facility the original owner’s purchase receipt or sales slip showing from whom the product was purchased, the date of purchase and the unit’s purchase price.

In the event that proof of purchase cannot be established as stated in the preceding paragraph, the warranty period shall commence on the date of manufacture, provided the serial number on the unit has not been altered in any manner.

During the warranty period, ATI will repair, or at its sole option, replace at no charge, components that prove to be defective provided the product is returned in accordance with the shipping instructions that are contained in the unit. The unit is to be sent FREIGHT PREPAID in the original carton and packing along with a detailed description of the problem to ATI in the event it needs factory servicing. ATI will return the unit prepaid to you upon completion of the service

Optional Extended Warranty Program

The standard 90-Day Limited Warranty will be extended to a 7-Year Limited Warranty if the following conditions are met:
The ATI product is purchased from an authorized ATI reseller;
The customer completes and returns the registration card to ATI or the ATI distributor (if the unit is purchased outside the United States) or completes the warranty registration process at: www.ati-amp.com AND submits a copy of the original bill of sale to ATI within 14 days of purchase.

This extended warranty is transferrable to subsequent owners of the ATI component as long as all of the Optional Extended Warranty conditions are met.

PLEASE RETAIN A COPY OF THE ORIGINAL PROOF-OF-PURCHASE. It will be necessary should in-warranty service ever be required.

Transferability

The above warranties are transferable to subsequent owners as long as all of the conditions are met under the Optional Extended Warranty Program. The warranty is not transferable if the unit was originally purchased from an unauthorized seller.

The above warranties do not apply if the product has been damaged by accident or misuse or as a result of modification by other than the ATI factory service facility.

ATI shall not be held liable for incidental or consequential damages of any kind arising from the sale or use of its products.
Some sates do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

THERE ARE NO WARRANTIES GIVEN BY ATI THAT EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF. ALL IMPLIED WARRANTIES OF FITNESS FOR PURPOSE SOLD, MERCHANTABILITY, DESCRIPTION, QUALITY PRODUCTIVENESS OR ANY OTHER MATTER ARE LIMITED TO THE TERM OF THE EXPRESS WARRANTIES HEREIN STATED.

Some states do not allow limitations on how long an implied warranty may last, so the above limitations may not apply to you.

Obligation to Make Changes

Products are sold on the basis of specifications applicable at the time of sale. ATI shall have no obligation to modify or to update products once sold.

This warranty gives you specific rights and you may also have other rights that vary from state to state. This warranty is applicable only in the United States.

Warranty Outside the United States

ATI has formal distribution agreements in many countries. The ATI importer in those countries has assumed the responsibility for servicing ATI products. Please contact the dealer or distributor in the country where you purchased your product for any service issues.

Amplifier Technologies, Inc.
1749 Chapin Road
Montebello, CA 90640 USA
Tel: (323) 278-0001 Fax: (323) 278-0083
www.ati-amp.com support@ati-amp.com

References

• Connectors: Browse Our Portfolio | TE Connectivity
• Amplifier Technologies Inc.

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