Madrigal Imaging Five Channel Amplifier manual Pin 1 Signal ground

If you are not using these turn-on inputs, you may leave them both empty of any plugs.

4BALANCED AUDIO INPUTS

Accepts signals from preamplifiers with balanced outputs via high quality XLR connectors.

The pin assignments of these XLR-type female input connectors are:

PUSH		Pin 1: Signal ground
2	1	Pin 2: Signal + (non-inverting)
		Pin 3: Signal – (inverting)
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Connector ground lug: chassis ground

These pin assignments are consistent with the standards adopted by the Audio Engineering Society. Refer to the operating manual of your balanced- output preamplifier to verify that the pin assignments of its output connec- tors correspond to your Proceed amplifier. If not, wire the cables so that the appropriate output pin connects to the equivalent input pin.

If you are planning to use balanced connections between your preamplifier and any particular channel of the amplifier, select the balanced input by sliding the input select switch (see Item 5, below) toward the XLR input. Then connect the balanced outputs of your preamplifier to the correspond- ing balanced inputs on the amplifier using high quality cables such as CZ Gel-1.

5INPUT SELECT SWITCH

This small switch is found between the balanced XLR input and the single- ended RCA input on each channel of the amplifier. Use it to select which of the two inputs you plan to use.

The input select switch disables the unselected input in order to avoid any pickup of stray noise from what would otherwise be an open input. It also causes the effective gain of that channel to be adjusted (either 23 dB bal- anced or 29 dB single-ended, to compensate for the 6 dB difference in sig- nal level in these two connection standards). Should you use your amplifier in a home theater system, this adjustment allows you to use any combina- tion of balanced and single-ended connections without having to worry about going outside the adjustment range of your surround decoder’s out- put calibration circuitry.

6SINGLE-ENDED INPUTS

Accepts signals from preamp/controllers with single-ended outputs via high quality RCA connectors.

If you are planning to use single-ended connections between your pream- plifier and any particular channel of the amplifier, select the single-ended input by sliding the input select switch (see Item 5) toward the RCA input. Then connect the single-ended outputs of your preamplifier to the corre- sponding single-ended inputs on the amplifier, using high quality cable such as CZ Gel-2.

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