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Operating Manual - LX-308B Stereo Line/Microphone Mixer

BACK PANEL FEATURES

1 Inputs

The LX-308B stereo inputs use two 20KΩ balanced

1/4" TRS phone jacks per channel, with (+) signal on the tip,

the (-) signal on the ring, and ground on the sleeve. If you

wish to drive a mono source into the stereo mix, simply plug

your signal into the right channel input. Channels 1 and 2

are switchable to add 30dB gain for low impedance dynamic

microphones.

2 Sub In

The Sub inputs are nominal 10KΩ unbalanced types

on 1/4" phone jacks. They feed directly to the mix busses at

a nominal +4dBu level and are useful for coupling multiple

mixers.

3 Sub Out

The Sub Outputs are unbalanced types on 1/4" phone

jacks. Typically, they will feed sub inputs on additional mixers.

Nominal operating level is +4 dBu.

4 Main Outputs

Right, left, and mono outputs are 200Ω servo-

balanced on 1/4" phone jacks. Nominal operating level is +4

dBu and maximum headroom is +22dBu.

5 Wiring Suggestions

If low level and high level lines (e.g., microphones

and mixer line outputs), or if either of these lines and speaker

cables are run parallel for long distances, crosstalk may be sig-

nificant. In fact, the crosstalk (signal leakage between cables)

can cause an electronic feedback loop, oscillation, and possibly

damage to the equipment. To minimize crosstalk, physically

separate low level (microphone) cables from speaker cables by

the greatest feasible distance. At any point where cables meet,

run low level cables perpendicular to high level or speaker

cables. If low and high level or speaker cables must be run

parallel and in close proximity to one another, they should be

bundled separately.

TROUBLESHOOTING TIPS

No Sound

Check the AC power. Is the power switch on and the

power LED illuminated? Check the level meters. If they are

operating, the problem between the mixer and the later com-

ponents in the system. If not, check to see you really have an

input signal and that it is on the desired channel. Check that

you have the master gain controls at the desired operating level.

Distorted Sound

Something is being overdriven in the signal path. If

the clip indicators are active, reduce the channel level controls.

If the clip indicators are still active, reduce the input signal

level. If the level meters are constantly in the red, reduce the

Master gain and increase the gain of components following

the mixer. There are many gain adjustments in the mixer itself

and probably several others in other system components which

makes it possible to overdrive an input section and then incor-

rectly try to reduce the gain of the output section. The best way

to approach setting gains is to establish the operating level of

input stages first by setting their gain as high as possible but

leaving about 20dB of headroom for loud peaks, then move

on to set the master gain to produce a good meter reading.

Proceed to set the gain of equalizers, limiters, crossovers, and

amplifiers following the mixer in the same manner, always

working toward the later stages of the system.

Excessive Noise

If the noise is in the form of hiss, the problem is usu-

ally due to an input stage set up for low gain and then com-

pensating by increasing the master gain. Turn up the channel

level controls and reduce the master gain.

Excessive hum

This is usually caused by "ground loops" in the system

wiring. A complex sound system with many sources separated

by significant distance and using several power outlets has

many opportunities for this problem to occur. If possible,

feed everything in the system from one power source with a

common ground.

If you need help, get in touch with your Ashly dealer

or call an Ashly technical service representative at 1-800-

828-6308.