Yorkville VGM14 - Manuel (Page 6)

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Realizing that some VGM14 users may be unfamiliar with certain features, this manual
will help to explain the various functions through describing specific functions for by user.
For general information about mixing and other facets of sound-reinforcement check
out our P.A. User Guide available on the internet... (http://www.yorkville.com).
Input Channel Features
1. Microphone Inputs
All mono and stereo input channels have microphone XLR inputs. These microphone inputs
are balanced for maximum noise suppression. The VGM14 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 dynamic microphones can also connect simultaneously without 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 con-
nections 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 sim-
plifies 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 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 sources to the mono channels;
however you will need to plug the Left and Right 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 single 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(eft) and the other is set to R(ight). this will make sure that the left
and right music signals remain separate.
Channels 9 and 10 have high impedance, unbalanced ¼-inch inputs. They’re opti-
mized for instruments such as electric or acoustic guitars. To change to a high imped-
ance input, push the appropriate Hi-Z switch.
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.
1/4-inch Phone Plug
1/4-inch T.R.S. Phone Plug
XLR Plug