Ddt - Peavey PV 1200 Operating Manual

are 1200 watts RMS into 4 ohms (minimum load). Bridge mode operation is accomplished by placing the mode
switch in the "BRIDGE" position, connecting the positive speaker lead to Channel A red binding post, negative
speaker lead to Channel B red binding post, and using Channel A as the input channel. All Channel B input
functions are defeated, and they serve no purpose now. Another application for Bridge mode operation is to drive
sound distribution systems in very large public address applications. In this mode, the PV 1200 power amplifier
can actually drive 70 volt systems directly without using matching transformers. Another common use for the
Bridge mode is in subwoofer applications where very high power levels are required to reproduce extreme low
frequencies. Such enclosures usually contain 2 or 4 loudspeakers to handle the power levels involved. For
Bridge mode usage, the enclosure impedance must be 4 or 8 ohms—never below 4 ohms!

DDT

™
Peavey's patented DDT (Distortion Detection Technique) compression circuit enables the user to maximize the
performance of the amplifier/speaker combination by preventing the power amp from running out of headroom
(clipping). This compression system is activated by a very unique circuit that senses signal conditions which might
overload the amplifier and activates compression (reduces the amp gain) when clipping is imminent. Threshold of
compression, then, is clipping itself, and no specific threshold control is used. This technique effectively utilizes
every precious watt available for the power amplifier to reproduce the signal while at the same time minimizing
clipping and distortion and thus significantly reducing the potential of loudspeaker degradation and damage. The
DDT system is an automatic hands-off approach to the problem of power amplifier clipping. Since the PV Series
power amplifiers use circuit breakers for "over current" protection, the DDT compression system plays even a
more important role in continuous performance by preventing each channel from clipping and overload. Continu-
ous operation at clipping can cause the circuit breakers to trip, but with the DDT activated, this problem is mini-
mized. For this reason, you should always have the DDT compression system enabled.
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