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NOTE: Channels 5-9 contain features that differ from the previous channels.
Only those features are mentioned below. For information on features not
mentioned please refer to the section for Channels 1-4.
CHANNELS 5-6
10. LINE: 1/4" balanced TRS input for line level signals. This signal is connected
through a 25 dB pad to the mic input below it.
11. LOW CUT: This is a low-cut filter with a corner frequency of 80 Hz used to
filter rumble, wind noise, breath thumps, stage noise, and other low-frequency
components that rob power from the amplifiers and muddy the signal. Depressing
this switch will affect channels 1-6 only. Use of the filter will not affect the Monitor
signal.
CHANNELS 7-8
12. RIGHT INPUT: High-impedance 1/4" input for line-level signals. The Right
Input is adjusted by the Level control (#4). The signal is then routed to the internal
power amp. If the XR 684 is in Left/Right mode then the signal will go to the Right
Speaker Output (#37). In Mon/Main mode the signal is combined with the Left
and placed on the Main Speaker Output. The right signal can also be patched out
of the XR 684 via the Right Output jack (#31) to external components such as
effects, power amps, and recording devices.
13. LEFT/MONO INPUT: High-impedance 1/4" input for line-level signals. The
Left/Mono input supplies signal to both the Left and Right channels (if there is
nothing inserted to the right input jack) through the Level control (#4). In
Left/Right mode the signal will go to the Left Speaker Output (and Right Speaker
Output if nothing is inserted to the right input jack). In Mon/Main mode the signal
is combined with the Right and placed on the Main Speaker Output.
CHANNEL 9
14. TAPE IN: This stereo RCA phono jack accepts a stereo input (nominally
-10 dBV) from the output of a tape deck or CD player and places it on the Left
and Right channels as well as the Monitor Mix.
15. TAPE OUT: This stereo RCA phono jack provides a signal for the recording
inputs of a stereo tape deck.
CAUTION: DO NOT HOOK THE TAPE IN AND TAPE OUT TO THE INPUT AND
OUTPUT OF THE SAME DECK. DOING SO WILL FORM A LOOP
CAUSING SEVERE FEEDBACK. USE SEPERATE DECKS FOR
RECORDING AND PLAYBACK.
MASTER SECTION:
16. EFFECTS PEAK LED: Illuminates to indicate -6 dB of headroom before the
signals being sent to the effects circuit are clipped. Ideally, you would want this
LED to light only occassionally if at all. An occassional blink indicates that you
have the levels at an optimum setting. It is advisable to listen carefully to the
output at the same time in order to determine the final setting.
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