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LD PA 400, User Manual

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Summary of Contents for PA 400

Page 1: ...h the exception of the PA400 all amplifiers operate in Class H mode i e the operating voltage changes depending on signal level This improves efficiency as the power amplifier gives off substantially less heat The circuit is completely balanced with a feedback of only 20 dB resulting in a very fast amplifier with only slight distortion In particular the rough unpleasant sound associated with TIM d...

Page 2: ...echnician if service is required Each side of the power amplifier has its own fan the speed of the fans is automatically controlled according to temperature The electrical layout i e the circuitry principle of the power amplifier is strictly balanced and fully complementary Setup The power amplifier is relatively easy to install It is intended for installation in standard 19 racks The minimum inst...

Page 3: ...d be turned up all the way This can however result in increased noise levels when certain signal sources are connected especially if these sources e g mixing boards deliver output voltages far exceeding those required for maximum modulation In this case it is more advantageous to turn back the volume controls so that the maximum desired volume is still attained The volume controls are detent poten...

Page 4: ...nding posts nor connect a red with a black binding post 9 Fuse The PA series amplifiers are equipped with a reset able fuse In most cases there is a reason if the fuse trips If this happens switch off the power reset the fuse and switch on the power again If the fuse repeats to trip the unit is faulty and needs service by an authorized service department Never try to restrain the reset knob 12 Gro...

Page 5: ...case the filter is inactive The purpose of this filter is that with the filter activated the power amplifier can be used to drive a subwoofer directly without an external crossover Because of its high output the PA 1600 is especially suitable for driving bass systems 5 LO CUT Low Cut Filter Extremely low frequencies at the bottom end of the audible range and below can easily damage the bass loudsp...

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