NADY AUDIO PRM-400
Owner's Manual

CONTROLS AND CONNECTIONS
1. CHANNEL INPUT SECTION
(1) MIC INPUT The Mic input is an electronically balanced XLR type designed to accept (1) signals from any balanced low impedance (Low Z) microphone. To accommodate condenser microphones, this input is also equipped with (2) +48VDC phantom power globally switchable to all XLR input jacks with the Phantom Power switch (23) on the master (3) Section of the front panel. Dynamic or ribbon-type microphones do not require phantom powering. It will be necessary to adjust the channel gain with the input Trim control (4) and/or Pad switch (5) to achieve a nominal operating level. The XLR jack is configured for: Pin1 = ground, Pin2 = positive (+), Pin3 = negative (-). [Note: The Mic inputs are more sensitive than the Line inputs. Also, do not connect mics with the phantom power switched on, as indicated by the Phantom Power On LED (24) in the Master Section of the front panel. Never use unbalanced mic cables with the Phantom Power switched on. Never short the +48VDC to ground, as that can cause serious damage to your mixer. Also, turn down the Stereo Master faders (27A, 27B) to prevent possible sharp transient noise from damaging the speakers when turning the phantom power on or off.] (2) LINE INPUT The Line input is designed to accept balanced or unbalanced line-level signals such as those from keyboards, drum machines, or samplers. There is enough gain available on the line input to accept even lower level signals, such as those from an unbalanced microphone or guitar output. Use the Trim control (4) and/or Pad switch (5) to adjust for the desired level. If a balanced signal is to be connected to the line input, then a 1/4� TRS (stereo) phone plug should be wired for: Tip = positive (+), Ring = negative (-), Sleeve = ground. (Note: Only the Mic or the Line input of a given channel can be connected at one time. Never connect both simultaneously to the same channel.) (3) INSERT All 6 channels are equipped with insert jacks to connect external signal processors such as compressors, noise reduction systems, or effects devices to the individual input channels. Insert points are useful for adding dynamic processing or equalization to a channel or the mix. Unlike reverbs, etc.,
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which are usually added to the dry signal, dynamic processing is normally applied across an entire signal. Here an Aux Send would be inappropriate. Instead, the signal is intercepted somewhere along the channel, fed through the dynamics processor and/or EQ, then returned to the console at the same point where it left. The insert point is normalized, i.e., the signal is only interrupted when a plug is plugged into it. The insert jack is located post EQ in the channel and is configured as: Tip = send, Ring = return, Sleeve = ground. The Insert can also be used as a channel direct output by sending the signal from the ring. To use the Insert as a direct output, insert a 1/4� phone plug halfway into the Insert jack so the tip of the plug connects with the ring of the insert jack. The jack will click into place when the connection to the ring is made. (4) TRIM The trim control adjusts the input sensitivity (channel gain) of the Mic and Line inputs on the input channels. This control can be adjusted to accommodate input signals from a wide variety of sources, from the high outputs from keyboards or drum machines to the small signal outputs of microphones. The trim control adjusts the input sensitivity from -20dB to -60dB with the -20dB Pad switch (5) in the OUT position, and -40dB to 0dB (4A) with the pad in the IN (button depressed) position. The best balance of S/N (4) and dynamic range will be achieved if you adjust the TRIM control on each channel separately so that the Peak Indicator LED (4A) for that channel lights occasionally. (4A) PEAK LED INDICATOR The Peak LED illuminates when a channel is going into overload. It detects the peak level after the EQ and will light at approximately 5dB before clipping to warn that the signal is approaching overload. You do not want the Peak LED to light except very intermittently during a take or a mix. If it does light persistently, reduce input gain with the TRIM control (4) or PAD (5).

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