User manual AMERICAN AUDIO V3000

[. . . ] The exclamation point triangular symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the user manual accompanying the CD player. For optimum performance and reliability DO NOT PRESENT THE AMPLIFIER WITH A SPEAKER LOAD OF LESS THAN 2 OHMS. OR ANY COMBINATION OF SPEAKERS THAT TOGETHER ARE LESS THAN 2 OHMS PER SIDE!· Using one speaker, it must be rated at 2 ohms minimum. [. . . ] INVERTING INPUT ·BALANCED ·SYMETRIQUE ·SYMMETRISCHE ·BALANCEADO NON-INVERTING INPUT + GROUND ·UNBALANCED ·ASYMETRIQUE ·UNSYMMETRISCHE ·UNBALANCEADO NON-INVERTING INPUT + GROUND OUTPUTS (Banana Jack Connection) Strip back insulation 13-mm. 13mm 1/2" LIMITER The limiter has a fixed threshold and will prevent continuous clipping. Below clipping, and during short clips on peaks, the limiter does not act on the audio signal. The limiter for either channel can be disabled independently using the slide switch on the front panel. OFF LOW CUT FILTER ON 12 34 The low-cut filter removes ultra-low frequency information from the audio signal 1 Low 3 ON=30Hz Cut Filter OFF=50Hz that could damage or cause distortion in a loud speaker system. The dip switch 2 ON=30Hz 4 Low Cut on the rear panel allows you to enable or disable the filter independently for OFF=50Hz Filter either Channel, as well as set it for either a 50Hz or 30 Hz cut-off. Always use the 50 Hz filter setting if you are using the amplifier to drive a distributed line system (also known as a constant-voltage line, 70 volt line, etc. ) CH. 1 CH. 2 Page 6 · American AUDIO V3000 / V2000 MK II Power Amplifier Instructions OPERATION CONFIGURING THE AMPLIFIER A 4-position dip switch on the rear panel allows you to configure certain amplifier characteristics. A diagram on the rear panel shows the individual switch functions and settings. . LOW-CUT FILTER: Setting position 1 to "ON" enables the low-cut filter on channel 1 and "OFF" disables it. Position 4 does the same LOW CUT FREQUENCY for channel 2. 30 50 LOW-CUT FILTER FREQUENCY SELECTOR: When setting position 1 or 4 to "ON" then position 2 or 3 up to cut-off of 30 Hz and down is for 50 Hz. GAIN CONTROLS The gain controls are located on the front panel and are calibrated in DB of attenuation from full gain. It is best to adjust the amplifier so no "hissing" is heard from speakers with no music being played. LED INDICATORS Each channel has 6 LEDS. 2 green LED and 2 yellow LED for level indication, 1 red LED for power clips, 1 red LED for short / overload, and the green LED at center for power indicator. BUILT IN PROTECTION LIMITER: During signal overload, the limiter will reduce the input audio signal enough to minimize the amount of clipping. During normal operation, the limiter does not affect the audio signal. It will allow brief clipping of peaks and will only activate when continuous, hard clipping occurs. When the signal amplitude decreases enough that clipping ends, the limiter will deactivate and cease its gain reduction. When the input signal overloads, the "CLIP LED's" indicate a signal overload. [. . . ] All channel output will be interrupted (i. e. no sound output), during the "SHORT CIRCUIT PROTECTION. " SHORT CIRCUIT PROTECTION can usually be traced back to the signal output line (i. e. Check the line from the output terminal to the speaker. [. . . ]