Yorkville PGM8 User Manual download pdf (Page 4)

Input Channel Features

1. Microphone Inputs

All mono and stereo input channels have microphone XLR inputs. These microphone inputs

are bal anced for maximum noise suppression. The PGM8 active input circuitry accepts micro-

phones with impedances ranging from 50 ohms through 10,000* ohms. All low impedance

microphones are compatible. Phantom power (covered in the Rear Panel section of this man-

ual) is available on all Mic inputs when activated. This feature is for condenser microphones

but you can also connect dynamic microphones without any problems.

*Although it would be customary to plug high impedance microphones into the Line

jacks, most of them will also work in the Mic inputs, provided the microphone’s built-in

XLR connections are wired with the audio signal on pin 2 and pin 3 is connected to pin 1.

2. Balanced Line Inputs

Mono line-level sources, such as guitar amplifier line-level outputs, keyboards, and

hi-impedance microphones, connect to the mono or stereo channels through the line

input jacks. The Left and Right Line inputs on the stereo channels are wired internally

so that a single (mono) signal connected to the L/Mono input will also be patched over

to the Right input (as long as a phone plug is not plugged into the Right jack). This

simplifies connecting a mono source, should the need arise (in the situation where all

the mono channels are taken).

You can connect stereo audio sources such as a digital audio player, CD-player, MP3

player or tape deck to the Line inputs on the stereo channels. Use RCA to phone plug

adapters to connect RCA cables to the Line inputs. It is possible to connect stereo sourc-

es to the mono channels, however you will need to plug the L&R signals into separate

channels to avoid the risk of inter-modulation distortion. The inter-modulation distortion

may be caused by using a “Y” connector to combine the left and right signals into a sin-

gle Line jack. If you connect a stereo source to two mono channels don’t forget to adjust

the Pan controls so that one is set to L and the other is set to R. this will make sure that

the left and right music signals remain separate.

Channel 4 has a very high impedance, unbalanced ¼-inch input which is opti mized

for instruments such as acoustic electric guitars. Push the Hi-Z switch in to change

channel 4 to a high impedance input.

The balanced connector wiring is:

Tip (or XLR pin 2) = hot, in phase;

Ring (or XLR pin 3) = hot, reverse phase;

Sleeve (or XLR pin 1) = ground

You can connect an unbalanced source to the Line inputs with a standard unbalanced

shielded patch cable without any adverse affects.

A slight modification to a balanced patch cable will help achieve noise cancellation

when connecting the PGM8 to an unbalanced unit. Simply modify one end of a bal-

anced patch cord and de-solder the wire from the ring tab, then resolder the wire to the

1/4-inch Phone Plug

1/4-inch T.R.S. Phone Plug

XLR Plug

Line

Line Line Line

5/6

Mic MicMicMicMicMic

7/8

Hi-Z

1 2 3 4 5 6 7 8 9 ... 27 28

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Yorkville PGM8 User Manual Page 4

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