Symetrix 628 Digital Voice Processor, Руководство пользователя

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628
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device, please turn down the fader, or input gain control, to protect your equipment from
any transients.
Note: We wired the microphone input with Pin #2 high (+), Pin #3 low (-) and Pin #1
ground or shield.
Warning: To prevent hazard or damage, ensure that only microphone cables and
microphones designed in compliance with IEC-268-15A are connected.
If your microphone is a dynamic type, leave the PHANTOM POWER switch in the OFF position
(out). Switch the PHANTOM POWER to the ON position (in) when using a condenser micro-
phone. Please consult your microphone manual if you don’t know which type of you have. The
front panel PHANTOM LED will light when the phantom voltage is switched on.
Caution: Large transients (loud “pops” and “whoomphs”) will be generated when
turning the phantom power on and off . If you have connected the output of the
628 to a console input or other audio device, please turn down the fader, or
input gain control, to protect your equipment from any transients.
Connecting to a line level audio source ...
When you plan to use the 628 with a line level audio source connection may be made to either the
3 pin, female XLR connector or the 1/4 inch TRS jack. Pin #2 is high (+) on the XLR; tip is high (+)
on the TRS jack. The 628 will accept a line level signal up to +22 dBu at the LINE INPUT connec-
tors. You may connect either a balanced or unbalanced circuit to the 628’s input. It is OK to plug
a TS (tip & sleeve) plug into the TRS (tip, ring & sleeve) input jack. Use the GAIN control to
adjust the line level input signal.
Caution: The 628 accepts analog inputs only. There is no provision for a digital input
signal.
Warning: Do not connect the line input of the 628 directly to a telephone line. Use a
telephone coupler or telephone hybrid for interfacing with a telephone line.
MIC
PRE-AMP
75
-15 PAD
NORM
15
GAIN
(dB)
PHANTOM CLIP
LINE
+20 -12
Locate the MIC/LINE switch on the far left side of the 628 front panel. When using a microphone
as the audio source, make sure that the button is pushed in. If you wish to use your line level
audio source, push the MIC/LINE switch to the out position.
You can’t have it both ways ...
The 628 allows you to use either the microphone input or the line input,
but not both simultaneously. When you select the “MIC” position, the
628 disconnects the line level input. If you select the “LINE” input the
microphone preamp is disconnected from the input circuit. This keeps
residual noise to a minimum.
Too hot?
Directly below the MIC/LINE switch is the switch for a 15 dB PAD (a
fixed attenuator). You will want this switch in the NORM (normal)
position for most microphones. If you know that your condenser
microphone has an unusually high output, change the pad switch to the
15 PAD position (push-button in).
Caution: If you notice the CLIP LED flashing while you use the 628 and you have the
GAIN attenuator at a 9:00 o’clock position or lower, you should engage the 15
dB PAD. The input circuit will also clip if a line level audio source is connected
to the MICROPHONE INPUT connector.