User manual CARVIN DCM1000

[. . . ] CARVIN ENGINEERING DATA DCM600, DCM1000 POWER AMPS OPERATING MANUAL 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 isolators". Unlike amps that use FET controlled limiters which can inject small amounts of distortion, the DCM Series limiters keep your sound pure and uncolored! DCM600, DCM1000 The DCM Series professional amps are designed utilizing Carvin's 35 years of experience in power amp technology. [. . . ] The input GND LIFT (1/4" & XLR) 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 and then cutting the ground wire to PIN 1. 4. CHANNEL SIGNAL INDICATOR The green SIGNAL LED indicators will start to flash when there is a signal passing to your speakers (-30dBM). This lets you know when the amp is passing a signal to your rear speaker connectors. 5. CHANNEL CLIP INDICATOR The red CLIP LED indicators will start to flash when each channel has reached its maximum output. However, consistent flashing caused from higher frequencies may damage high frequency drivers (excessive distortion). The built-in high quality limiters are recommended to hold down peaks that could cause early distortion. Limiters will help 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. WARNING: Do not check in an environment where the sound level could damage your ears! 6. FRONT COOLING VENTS/FAN Upon rack installation, the rear of the amp must be fully exposed to room temperature air. The surrounding air should not be warmer than 120° or the thermal protection could active the PROTECT LED. The front cooling vents are not to be restricted from exhausting the warm air. 13. SPEAKER OUTPUTS The standard 1/4" SPEAKER jacks are used for lower power applications. PROTECT LED INDICATOR The red 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 protecting your speakers); 1) During 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). 2) When the output load draws excessive current or a direct short is detected 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 per ch or 4 ohms BRIDGED). 3) Overheating is usually determined when the amp stops in the middle of a performance and the PROTECT LED comes on. If this is the cause, leave the amp on for the fan to cool the amp down. [. . . ] Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. POWER SOURCES: The product should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance. GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization is not defeated. POWER CORD PROTECTION: Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance. [. . . ]