artproaudio SLA-2 TWO CHANNEL STUDIO LINEAR AMPLIFIER User Manual

SLA-2
TWO-CHANNEL STUDIO LINEAR AMPLIFIER 

User’s Manual

IMPORTANT SAFETY INSTRUCTIONS – READ FIRST

**| CAUTION
RISK OF ELECTRIK SHOCK
DO NOT OPEN| **
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ATTENTION RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR

**** This symbol, whenever it appears, alerts you to the presence of uninsulated dangerousvoltage inside the enclosure. The voltage may be sufficient to constitute a risk of shock.

**** This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read the manual.

Read instructions: Retain this safety and operating instructions for future reference. Heed all warnings printed here and on the equipment. Follow operating instructions printed in this user guide.
Do not open:
There are no user-serviceable parts inside. Refer any service work to qualified technical personnel only.
Power sources:
Only connect the unit to the main power type marked on the rear panel. The power source must provide a good ground connection.

Power cord: Use the power cord with a sealed mains plug appropriate for your local mains supply as provided with the equipment. If the provided plug does not fit into your outlet consult your service agent.
Route the power cord so that it is not likely to be walked on, stretched or pinched by items placed upon or against it.

Grounding: Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the ground connection on the power cord.

Ventilation: Do not obstruct the ventilation slots or position the unit where the air required for ventilation is impeded. If the unit is to be operated in a rack, case or other furniture ensure that it is constructed to allow adequate ventilation.
Moisture: To reduce the risk of fire or electrical shock do not expose the unit to rain, moisture, or use in damp or wet conditions. Do not place a container of liquid on it, which may spill into any openings.
Heat:
Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard. Locate the unit away from any equipment, which produces heat such as power supplies, power amplifiers and heaters.

Environment:
Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink spillage, and smoke, especially that associated with smoke machines.
Handling:
To prevent damage to the controls and cosmetics avoid rough handling and excessive vibration. Protect the controls from damage during transit. Use adequate padding if you need to ship the unit. To avoid injury to yourself or damage to the equipment take care when lifting, moving or carrying the unit.
Servicing:
Switch off equipment and unplug the power cord immediately if it is exposed to moisture, spilled liquid, objects have fallen into an opening, the power cord or plug becomes damaged during a lightning storm, or if smoke odor or noise is noted. Refer servicing to qualified technical personnel only.

Installation: Install the unit in accordance with the instruction printed in the user guide.

INTRODUCTION

Thank you for purchasing an ART SLA-2 Studio Linear Amplifier – and congratulations, you now own one of the most versatile amplifiers available. Offering a superb level of sound quality, the SLA-2’s clean and powerful circuitry combined with a straightforward user interface quickly and easily delivers the power you need for a wide variety of project and professional studio environments, and broadcast and installation applications.

Features

• Extremely low noise, discrete linear design
• 200 Watts/Channel @ 8 Ohms
• 560 Watts/Bridged Mono @ 8 Ohms
• Toroidal transformer
• 10 Hz to 40 kHz within 1dB
• XLR, Euroblock & ¼” Inputs
• Thermal-dependent cooling system
• Multi-way binding post outputs
• Low profile 1U rack-mountable design
• Optional tamper-proof security cover included
• All-steel chassis
• Perfect for Pro and Project Studio, Broadcast, and Installation applications

INSTALLATION

The SLA-2 may be used in a wide variety of project and professional studio environments. Self-contained in a steel and aluminum enclosure, the unit is designed for many years of use. For greater reliability, we recommend that you not place the unit directly under or on top of other sources of heat. It is important that any rack-mountable unit is properly ventilated, and the SLA-2 is no exception.

AC Power Hookup

The SLA-2 has an internal power supply designed to operate at 120 VAC @ 50 to 60 Hz. Units manufactured for use outside of North America have been modified to comply with the required electrical specifications.
Audio Connections

Audio connections to and from the SLA-2 are balanced XLR [Pin 2 = Hot (+), Pin 3 = Cold (-), Pin 1 = (Ground)] and balanced or unbalanced ¼” [Tip = Hot (+), Ring = Cold (-), Sleeve = (Ground)].

EuroBlock connections: can be wired balanced or unbalanced. See the diagram on page 7

SECURITY COVER

For commercial installations, it may be desirable to set the gain controls on the power amp, and then make them inaccessible to non-qualified operators. This can be accomplished by using the Security Cover Plate which is included with the SLA-2. Simply set the channel attenuators to the desired gain settings, then press the knobs into the chassis until they lock in their recessed position. Then remove the two small Phillips head screws, one on each side of the two-channel attenuator knobs. Use these same
screws to attach the security cover plate to the front panel, thereby covering the two-channel attenuators, making them tamperproof.

SPEAKER LOAD SAFETY PRECAUTIONS

Warning:
For optimum performance and reliability, do not operate the amplifier with a speaker load of fewer than 4 Ohms per channel, or any combination of speakers that together are less than 4 Ohms.
Using one speaker per channel, it must be rated at 4 Ohms or greater. When using two speakers per channel, in parallel, they must each be rated at 8 Ohms, or greater.
When in bridge mode, the speaker load should be 8 Ohms or greater.

CONTROLS & INDICATORS – FRONT PANEL

FRONT PANEL DIAGRAM

Power Switch

The Power Switch is located on the front of the unit, directly in the center. During initial installation, make sure the attenuators for channels one and two are set to a low volume level before applying power.

Channel Attenuators

The dials for channel one and channel two’s volume attenuators are located to the left and right of the Power Switch. When set to zero (fully clockwise), there is no attenuation of volume. As the attenuation amount increases by turning counterclockwise, the volume is reduced. Full attenuation is at – infinity. The attenuators are calibrated in dB.

Signal Indicator LED

This LED indicates that a signal is present. The LED will glow when the amplifier output signal is within approximately 30dB of full scale.

Clip Indicator LED

 This LED indicates that the power amp is clipping. This LED comes on when the output signal from the amplifier begins to distort. When there is significant clipping, lower the input gains to reduce clipping, as well as the risk of damage to the speakers/monitors.

Protect Indicator LED

The LED will glow when the channel goes into protect mode. In protected mode, the output signal to the speakers will be muted (channel-specific). If there is a fault condition at the speaker outputs (due to a severe load or short) the LED will light until the fault is removed. The protect lights will also light briefly during power up and down, to indicate
that the output signal has been briefly muted.

REAR PANEL CONNECTION S

REAR PANEL DIAGRAM

It is easy to interface the SLA-2 with a wide variety of equipment. All inputs and outputs are located on the rear panel. Standard Euroblock, ¼” and XLR inputs and binding post outputs make patching simple.

INPUTS

The SLA-2 has three styles of input connections: Euroblock, XLR and ¼”.Use these connections to connect the output signal from a mixer, preamplifier, crossover, or EQ to the amplifier. Balanced connections are recommended for cable runs longer than 20 feet. For cable runs under 20 feet, unbalanced connections can be used. You may also use the two different types of input cables to jump a parallel connection to another amp. For example: connect an XLR cable to the input of channel one, then connect a ¼” cable to the input jack of channel one and jump that cable to the input of another amp or use the EuroBlock connections.

  ¼” Input Jack

The ¼” Input jacks are wired as follows: Tip is positive, Ring is negative, and Sleeve is ground. This connection can be used for both balanced or unbalanced connections.

XLR Input Jacks

The XLR Input jacks are Pin Two positive, Pin Three negative, and Pin One is ground. This connection is for balanced connections.

Euroblock Barrier Strip

Insert the wires, then snug down with the set screw. The entire barrier strip can be removed for quick service without disconnecting the individual wires.

EURO BLOCK DIAGRAM

Amp Mode switch

The SLA-2 Amp Mode Switch allows you to choose between Stereo Mode and Bridged Mono Mode. Make sure that power is off and that your speakers are wired appropriately when changing this model.

Output Binding Post

The SLA-2 Outputs are multi-connection jacks. You can use banana jacks, spade connectors or bare wire.

**BARE WIRE CONNECTIONS

**

– loosen the red and black caps on the binding posts (don’t completely remove them). Strip back the wire insulation ½”, then insert the bare wire into the hole on the side of the plastic assembly. Once it is in, screws the binding post cap down on the wire. Be sure that the wire connected to one post does NOT come in contact with that of another post.

SPADE CONNECTOR – Loosen the red and black caps on the binding posts (don’t completely remove them). Insert the spade connector into the binding post and tighten the caps down on the spade connector. Be sure that the wire connected to one post does NOT come in contact with that of another post.
BANANA PLUG – Insert the banana plugs into the caps of the binding posts. Be
sure that the red and black caps on the binding posts are tightened down
completely and that they are securely connected to avoid the possibility of
the banana plugs from popping out.

Cooling Fan

The SLA-2 features a variable-speed fan with thermal-dependent fan-assisted convection cooling. The fan is dependent upon the internal ambient
the temperature inside the unit, and runs at two different levels.

Do not block the fan or constrict air circulation. Doing so may cause the lamp to overheat and/or shut down.

Fuse

The SLA-2 utilizes a (T10A 250v 20mm) 10 Amp fuse. Be sure to replace any blown fuses with a fuse of equal rating only.

AC Power Input

The SLA-2 features an internal power supply. Plug the detachable cable into a standard wall outlet. Be sure that the supplied voltage matches that of the required voltage labeled on your amplifier. Never plug the amp into an outlet that does not match the required voltage of your amplifier. Serious damage could result.

OPERATION

The main application of the SLA-2 is as a studio linear power amplifier for
powering monitors. Connect source material directly into the inputs and set
the output controls to provide an appropriate level into the next stage of your
system.

Normal Operation

For a typical stereo setup, connect the source (mixer, eq, etc.) outputs into channels one and two of the amplifier. Connect your speakers to the outputs on the rear of the amplifier. Be sure that your front gain controls are turned down to their lowest level (full counter-clockwise). Turn the amp on, then slowly turn the input level up. Use the front gain controls to regulate the output volume. Be sure not to raise the volume past the clip level; however, an intermittent clip signal is acceptable.

Mono Bridge Operation

Be sure the amp is shut off. Press the Stereo/Mono switch (on the back) to the “in” position. Connect an input signal to channel one. Connect your speaker across the two red output binding posts on the rear of your amplifier. Turn your equipment on – your amplifier should be the last piece you turn on (be sure its volume is turned down). Apply an input signal to your amplifier. Use channel one’s attenuator to adjust your amplifier output level.

PROTECTION

The SLA-2’s output circuitry is fully protected from short circuits. An ultrasonic network decouples RF from the output and helps keep the amplifier stable with reactive loads.
The SLA-2’s heatsinks do most of the work in getting the heat away from the amplifier, in normal studio operation. A rear-mounted variable-speed fan provides extra cooling of the amplifier’s internal circuitry as needed. If in the unlikely event the heatsink should reach 194 degrees Fahrenheit, the amplifier will mute, until it cools down.

The SLA-2 is fully protected from shorts, opens, over-current, and overvoltage.  A relay disconnects the outputs under any fault conditions and automatically returns to normal operation once the fault is removed.
The amplifier is stable in loads as low as 2 ohms (stereo mode), and 4 ohms (bridged mode) when used in a fixed or permanent installation. However, for continuous operation of all channels at mid to high signal levels, the amplifier should be operated with a minimum load of 4 ohms per channel in stereo mode and 8 ohms per channel in bridged mode, otherwise, the overload and thermal protection circuitry may cycle the amplifier on and off as it protects itself.

WARRANTY INFORMATION

Limited Warranty

Applied Research and Technology will provide a warranty and service for this unit in accordance with the following warrants:
Applied Research and Technology, (A R T) warrants to the original purchaser that this product and the components thereof will be free from defects in workmanship and materials for a period of three years from the date of purchase. Applied Research and Technology will, without charge, repair or replace, at its option, defective product or component parts upon prepaid delivery to the factory service department or authorized service center, accompanied by proof of purchase date in the form of a valid sales
receipt.
Exclusions
This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs. This warranty is void if the serial number is altered, defaced, or removed.

A R T reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install the same on products previously manufactured.

A R T shall not be liable for any consequential damages, including without limitation damages resulting from loss of use. Some states do not allow limitations of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific rights and you may have other rights, which vary, from state to state.

For units purchased outside the United States, an authorized distributor of Applied Research and Technology will provide service.

SERVICE

The following information is provided in the unlikely event that your unit requires service.

1.  Be sure that the unit is the cause of the problem. Check to make sure the unit has power, all cables are connected correctly, and the cables themselves are in working condition. You may want to consult with your dealer for assistance in troubleshooting or testing your particular configuration.
2. Contact our Customer Service department via our website at: http://www.artproaudio.com and go to our “Resources” page and fill out our “Return Authorization request” form. Your report will be submitted to our department for immediate evaluation.
3. If you are returning the unit for service, pack the unit in its original carton or a reasonable substitute. The original packaging may not be suitable as a shipping carton, so consider putting the packaged unit in another box for shipping. Print the RA number clearly on the outside of the shipping box.
4. Include, with your unit, a note with the RA number and your contact information including a daytime phone number, preferably attached to the top of the unit.

Fill in the following information for your reference:
Purchase Date:
Serial number:

SLA-2 SPECIFICATIONS

Input Connections

Output Connections
Input Impedance

Input Sensitivity
Stereo Output Power, 8 ohms
Stereo Output Power, 4 ohms
Bridged Output Power, 8 ohms Stable into

CMRR
Frequency Response
Hum and Noise
Total Harmonic Distortion (THD) Slew Rate
Damping Factor
Transformer Type
Power Requirements

Dimensions (HWD)

Weight

| XLR, EUROBLOCK (balanced),
¼” TRS (balanced/unbalanced)
Multi-Way Binding Post
44k ohms (balanced)
22k ohms (unbalanced)
1V for Full Power Output into 8 ohms
200Watts RMS per Channel,
280Watts RMS per Channel
560Watts RMS mono
2 Ohms (stereo)
4 Ohms (mono)

60dB (typical @ 1kHz)
10Hz to 40kHz, +/- .5dB
100dB below clipping
<0.05% (typical)
20V/uS
100
Toroidal
100VAC 50Hz 1000 WATTS (max.)
120VAC 60Hz 1000 WATTS (max.)
220VAC 50Hz 1000 WATTS (max.)
230VAC 50Hz 1000 WATTS (max.)
240VAC 50Hz 1000 WATTS (max.)
1.75 x 19.0 x 13.5, Inch
44.5 x 482.6 x 342.9 mm
19.8 lbs., 9.0kg.
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Export units configured for country of destination.

ART maintains a policy of constant product improvement. ART reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install same on products previously manufactured. Therefore, specifications are subject to change without notice.

www.artproaudio.com
E-mail: support@artproaudio.com

© 2022 Applied Research & Technology
SLA25004105

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SLA-2 TWO-CHANNEL STUDIO LINEAR AMPLIFIER, TWO-CHANNEL STUDIO LINEAR AMPLIFIER, STUDIO LINEAR AMPLIFIER, LINEAR AMPLIFIER
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