Distortion At Mixdown Machine Or Sound System; Distortion On The Returns; Grounding; Section 5 - Alesis 1622 Reference Manual

2) Tape Machine input is overloaded. Set tape recorder input level control or SUB MASTER
levels so that the meters of the tape deck hit 0 VU or less when recording.
3) Monitor input of the 1622 MIXER is overloaded.
Multitrack Tape Deck.

DISTORTION AT MIXDOWN MACHINE OR SOUND SYSTEM

1) Input Channel is overloaded. Solo each channel until distortion is found, then decrease
either TRIM level or Fader level or both.
2) SUB MASTER is overloaded. Decrease the Fader levels of the channels assigned to SUB
MASTER.
3) MASTER Faders are overloaded. If LED meters are in the red, decrease MASTER Fader
level until distortion disappears. If LED meters are not in the red yet distortion is still heard,
decrease all Input Channel Faders.
4) Overloaded Return. Decrease output level of effects device or decrease RETURN level.
5) Effects unit is overloaded. Decrease output of SEND MASTER level or input level of
effects device.

DISTORTION ON THE RETURNS

1) Overloaded return. Decrease output level of effects device or decrease RETURN level.
2) Effects unit is overloaded. Decrease output of SEND MASTER level or input level of
effects device.

SECTION 5

GROUNDING

Grounding problems ("Ground Loops") are probably one of the most common and annoying
problems that plague not only home studios, but professional and commercial studios and sound
reinforcement systems as well. While there are methods to virtually eliminate ground loops and
stray radio frequency interference, most of the professional methods are expensive and involve
installing a separate power source just for the sound system. Since this is far from practical in
the majority of situations that the 1622 MIXER will be used in, here are some easy helpful hints
that a professional studio installer might use to keep those stray hums and buzzes to a minimum.
1) KEEP ALL ELECTRONICS OF THE SOUND SYSTEM ON THE SAME AC ELECTRICAL
CIRCUIT.
Without getting too technical, most stray hums and buzzes happen as a result of different parts
of the sound system being plugged into outlets of different AC circuits. If any noise generating
devices such as air conditioners, refrigerators, neon lights, etc. are already plugged into one of
the circuits, you then have a perfect condition for stray buzzes.
Since most electronic devices of a sound system don't require a lot of current (except for power
amplifiers), it's usually safe to run a multi-outlet box or two from a SINGLE wall outlet and plug in
all of the components of your system there.
2) KEEP AUDIO WIRING AS FAR AWAY FROM AC WIRING AS POSSIBLE.
Many hums come from audio cabling being too near AC wiring. If a hum occurs, try moving the
audio wiring around to see if the hum ceases or diminishes. If it's not possible to separate the
audio and AC wiring in some instances, make sure that the audio wires don't run parallel to any
AC wire (they should only cross at right angles if possible).
3) TO ELIMINATE A HUM IF THE ABOVE HAS FAILED:
A) Disconnect the power from all outboard devices and tape machines except
for the 1622 MIXER and control room monitor power amp.
B) If the hum still exists, flip the polarity of the plug (turn it around in the
socket) of the power amp and 1622 MIXER until the hum disappears or is
Decrease TRIM control or output of
33