CARVIN HT750 Power Amps Instruction Manual
- June 17, 2024
- CARVIN
Table of Contents
CARVIN HT750 Power Amps
OPERATING MANUAL
The HT Series professional amps are designed utilizing Carvin’s 33 years of experience in power amp technology. They meet and exceed every standard for professional amplification. Their thick brushed anodized aluminum face plates, large recessed knobs and heavy-duty steel chassis reflect the manufacturing quality within. The HT “High Energy Transfer” amps are available in three different models. All models carry the CE approval for world-wide use.
PURE–TRANSPARENT SOUND
Carvin considers the sound of an amp equally important as its reliability. To
ensure pure, uncolored sound, we designed one of the fastest responding power
amps on the market today. High slew rates greater than 45v/us deliver a superb
transient response. High frequencies are transparent and open even at extreme
levels. Linear feedback circuits reduce distortion to near the theoretical
zero limit, preventing any type of harshness that would lead to ear fatigue.
The HT Series amps deliver flat, transparent, unaltered sound – especially
important to the studio user. And you can drive any type of reactive load,
including 70V transformer distribution systems. These amps are designed to
deliver non-stop, continuous power and are completely protected from heat and
short circuits.
ULTRA-RUGGED FOR TOURING
Every chassis is made from heavy-duty 16 gauge steel that is galvanized before being painted to prevent rust. All internal cabling is neatly tied and harnessed. Every circuit card is MIL-SPEC, double-sided, through-hole plated, fire retardant FR-4 glass epoxy. This ensures that the solder flows on the top, bottom, and through each hole of every component, preventing components from shak- ing even through constant tour use. Neutrik™ XLR connectors, heavy- duty power switches, recessed knobs, machined aluminum front panels and extruded handles all give the HT amps a “tank-like” ability to handle rough, touring transport.
TOTALLY MODULAR
With the HT Series, Carvin brings you totally modular construction. If you
ever need an 1/0 (input/output) connector card because a connector wore out,
just unplug it and re-install the replacement card in minutes. You don’t have
to de-solder anything. This applies to every aspect of the HT Series amps
including the power supply, power cards, heat sinks and fans. Everything is
connected by heavy-duty AMP™ and MOLEXT™ type connectors for easy replacement-
even the Toroid transformer is a total plug-in.
HEAVY-DUTY COOLING
Carvin offers up to 30% more cooling than comparable amps rated at the same
wattage. This means that the HT Series are thermally “over-engineered” to be
sure heat will never be a concern. Even outdoor concerts in direct sunlight
will not cause thermal shutdown. Carvin uses precision 6063 T-5 aluminum high-
ratio heat sinks that are extruded for massive amounts of cooling. High-
efficiency, multi-speed fans cool your amp quietly even when moving air at up
to 115 CFM!
LOSE THE WEIGHT…NOT THE PERFORMANCE
For some companies, weight reduction means cost reduction. Carvin however,
uses expensive TOROID transformers to reduce weight. Toroids deliver massive
amounts of “on demand” current for continuous 2 ohm operation. This gives the
power supply a solid foundation, yielding more headroom for the largest
subwoofer application. Not only do toroids deliver high current, but they are
known for reducing stray magnetic fields eliminating hum & noise. This is
especially important for the recording industry.
For your records. you may wish to record the following information. Serial No. 76-10000 497 Invoice Date.
RECEIVING INSPECTION-read before getting started
INSPECT YOUR UNIT FOR ANY DAMAGE that may have occurred during shipping. If any damage is found, please notify the shipping company and CARVIN immediately. SAVE THE CARTON & ALL PACKING MATERIALS. In the event you have to re-ship your unit, always use the original carton and packing material. This will provide the best possible protection during shipment. CARVIN and the shipping company are not liable for any damage caused by improper packing. SAVE YOUR INVOICE. It will be required for warranty service if needed in the future. SHIPMENT SHORTAGE. If you find items missing, they may have been shipped separately. Please allow several days for the rest of your order to arrive before inquiring. RECORD THE SERIAL NUMBER on the enclosed warranty card or below on this manual for your records. Keep your portion of the card and return the portion with your name and comments to us.
DISTORTION-FREE LIMITERS
While most amps do not offer built-in limiters, this is an important feature
to look for. The purpose of a limiter is to hold down peaks so the amp won’t
distort even with extra hot input signals (this protects your expensive
speakers). In addition, a well-designed limiter can increase your amp’s
average output as much as 3 db. Part of Carvin’s design uses the more
expensive, distortion-free linear “opto iso- lators”. Unlike amps that use
FET-controlled limiters which can inject small amounts of distortion, the HT
Series limiters keep your sound pure and uncolored!
FRONT PANELS & CONNECTING UP
The HT Series features front panel signal, peak and protect LEDs which let you
monitor the status of the amp easily. Also, both channels use precision 41
detent level controls allowing you to see your settings at a glance. Balanced
1/4 phone & XLR input jacks are used to eliminate hum & noise. Speaker outputs
feature 1/4″ jacks & heavy-duty binding posts that accept up to 50 amp #7
speaker wires. The rear professional accessory group offers a GROUND switch to
remove the chassis ground from the XLR input, a Parallel input switch connects
the inputs of both channels together eliminating Y connectors and allowing amp
patching in multiple amp systems. The accessory group also features a bridge
mode switch for delivering full power into a 70V distribution system and a
limiter ON/OFF switch that gives vou the choice of using the internal limiter
circuitry.
HY POWER AMP SPECIFICATIONS
FRONT & REAR PANEL CONTROLS
FRONT PANEL
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MOUNTING Sturdy one piece aluminum handles make for easy transporting along with facilitating rack installation. The tack mounting holes are designed on ISO standard spacing. Four 10-32 x.5 phillip machine screws are normally used to secure the amp. Rear support brackets are not required.
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POWER SWITCH Check the power amp connections and verify thie AC line power source before engaging the POWER switch. The yellow LED unmistakably indicates that all circuits are properly powered up. Yellow was chosen so the operator could see the other indicators from a distance.
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CHANNEL LEVEL CONTROL A precision 41 step input LEVEL attenuate is used to adjust the volume levels. To deliver the amps full pozzer without seducing the headroom of the signal source. the level controls should bie torted up approx- imately 1/3 (15 on the tial).
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CHANNEL SIGNAL INDICATOR The green SIGNAL LED indicators will start to flash when there is a signal passing to your speakers (-3008M). This lets you know when the amp is passing a signal to your rear speaker connectors.
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CHANNEL CLIP INDICATOR The red CLIP LED indicators will start to flash when each channel has reached its maximum output. Occasional flashing caused ty lover bass frequencies is OK. However, consistent flashing caused from higher frequencies may darnage high-frequency drivers (excessive distortion). This does not cause damage to the amp.
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FRONT COOLING VENTS/FAN Upon tack installation. the rear of the amp must be fully exposed to room-temperature air. The sur- rounding air should not be warmer than 120^ or the thermal protection could active.
PROTECT LED, The tront cooling vents are not to be restricted from exhausting the warm air. -
PROTECT LED INDICATOR The ted PROTECT LED provides the operator with information about the status of the amplifier.
The PROTECT LED can come on under 3 different conditions (when this happens both channels are muted by disconnecting the output speaker relays)**** -
Duting power up, the amplifier stays in a muted state for approx. 3 sec until it determines that everything is functioning normally (no output shorts or over temp conditions)
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When the output load draws excessive current or a direct short is defected caused by a shorted speaker cable or speaker system. Reset this condition by turning the amp off for two seconds and then on again, Check for shorted cables and the total speaker system impedance connected to each channel (2 ohms minimum perch or 4 ohms BRIDGED).
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Overheating is usually determined when the amp stops in the middle of a performance and the PROTECT LED is on, It this is the cause. leave the amp.on for the fan to cool the amp. down. The amp will automatically reset within 1 to 3 minules. The PROIECT LED will fum off when ready Check for the following conditions; a) The rear intake air is restricted, b) Intake air is extremely warm. c) Front exhaust vents restricted, or d) Excessive speaker load (ity other speakers or remove speakers if you have more than one connected to each channel). Again, the minimum impedance is 2 olms der ch ot 4 ohms BRIDGEDYI
REAR PANEL -
XLR CHANNEL INPUTS For most professional applications. use the XLR balanced inputs. This will help to reduce hum and allow of longer cable runs from your signal source (mixer, etc). Because this is a balanced input, the gain will be 6 dB higher than using the 1/4* input jack with nonbalanced imes. XLR pin configuration; Pin 1. Grounded through the GROUND LIFT switch. Pin 2. positive Bal, signal and Pin 3. negative Bal signal.
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CHANNEL 1/4″ PHONE JACK INPUT This stereo phone jack is designed to receive either balanced or unbalanced input signals. Balanced signals coming into this jack should be wired with the connector’s tip going to signal + and the connector’s ring to signal – The connector’s sleeve is then tied internally to ground through the GROUND LIFT switch,
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PARALLEL OR “Y” INPUTS The rear PARALLEL switch allows you to drive both channels from either input. All signals entering any input will be available on both channels. This eliminates Y adapter cables. This feature is used to “daisy chain* one piece of equipment to another. Just plug into the unused INPUT (1/4” or XLR) and it will become an output for other equipment.
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INPUT GROUND LIFT Many times sound systems are connected in such a manner to cause a grounded loop with the inputs that result in audible hum. The input (1/4* & XLR) GROUND LIFT switch on the rear panel will help eliminate this problem. If not, another way to eliminate ground loops is to install a “line matching” transformer between the amplifier input and the signal source.
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LIMITERS To activate the LIMITERS, engage the rear limiter switch. The built-in high-quality limiters are recommended to hold down peaks that could cause early distortion. Limiters will heip to rise the average power so that you can get more output from each channel. To check the effectiveness of the limiters when the channel starts to distort (under the amps full output), engage the limiters and hear the reduction of the distortion. Il the distortion stops, you can turn the channel up for more power. The lower bass frequencies are most affected. WARNING: Do not check in an environment where the sound level could damage your ears!
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SPEAKER OUTPUTS The standard 1/4 SPEAKER jacks are used for most applications. Turn the amp off before connecting your speakers.
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SPEAKER BINDING POSTS For heavy-duty speaker connections, use the rear BINDING POSTS to connect your speakers. Wire sizes up to 7 gauge (50 amps) can be inserted into the binding post “side holes”. Larger cable can be used with “banana” plugs which plug into the end of the binding posts (remove colored caps). Binding posts are spaced on ISO standards. Use the two center RED binding posts for BRIDGE speaker connections (see 15 BRIDGE MODE).
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BRIDGE MODE-25V/70V DISTRIBUTION SYSTEMS The “ĐCM” Series can be operated in bridge mode if you require a 25V / 70V distribution speaker system or a high-powered mono (single channel) amp. With your amp off, push in the rear (recessed) BRIDGE switch after you have made your speaker connections to the rear center RED binding posts (ch 1 is + and ch 2 is – ). No other speaker connectors or binding posts can to be used at the same time!”. The INPUT and LEVEL is handled by channel 1. Channel 2 is non-operational. The minimum speaker impedance is 4 ohms or a 25V distribution line. CAUTION: The power developed by bridging your amp can destroy most speaker systems!astute gnomon, the power developed by unagily your dip von aretey most opting bystallo. distrootone, boom, the power developed by onagmy your ship can seetey host speare oystche
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AC POWER Your amp is designed to run on either 120V 60 Hz or 230V 50z depending on the model purchased. The voltage range for 120V model is 95V to 132V and for 230V model, it is 195V to 253V. The rear heavy-duty AC receptacle will accept a standard grounded AC cord that is designed your country. Be sure to check your power source before plugging into a grounded (3-prong) outlet. Never.defeat.the. grounded connection.or.electrocution may.result
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AC FUSE VALUES (Slow Blow Type)
References
Read User Manual Online (PDF format)
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