User manual PEAVEY EQ-31

[. . . ] You have just purchased the world's finest professional power amplifier. Peavey is proud to introduce you to the new PVTM 1200 amplifier. This amplifier uses proven technology gained from years of amplifier design, taking advantage of the rugged steel can TO-3 output devices for reliability. Unlike typical home stereo units, the EQ-31 employs massive power transformers, very effective two-speed fan cooling, and offers impressive specifications and features not found on any other competitive unit in this price range. [. . . ] The use of lighter wire will severely limit the power capability of this power amplifier. Always use a qualified electrician to install any new electrical equipment. To prevent the risk of shock or fire hazard, always be sure that the amplifier is properly grounded. INSTALLATION AND CONNECTION The PV professional series of power amplifiers is designed for durability in commercial installations and has the quality of performance required in studio and home applications. These units are a standard rack-mount configuration height, and each is cooled by an automatic two-speed internal fan. All input and output connections are on the back panel. Additionally, the level controls and selector switches are on the back panel. The front panel contains LED indicators for power & DDT activation, the mains power switch, and the resetable circuit breaker(s). INDUSTRIAL AND COMMERCIAL INSTALLATIONS For commercial and other installations where sustained high power operation is required, the amplifiers should be mounted in a standard 19" rack. It is not necessary to leave a rack space between each amplifier in the stack since each fan pulls air in from the rear and exhausts the hot air out the front. However, an adequate "COOL" air supply must be provided for the amplifier when rack-mounted. 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 EQ-31 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!DDTTM 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 product should be located so that its position does not interfere with its proper ventilation. It should not be placed flat against a wall or placed in a built-in enclosure that will impede the flow of cooling air. This product should not be placed near a source of heat such as a stove, radiator, or another heat producing amplifier. Connect only to a power supply of the type marked on the unit adjacent to the power supply cord. [. . . ]