Troubleshooting Tips; Specifications - Ashly MX-206 Operating Manual

7. TROUBLESHOOTING TIPS

7.1 No Sound
Check the AC power. Is the power switch on and
its LED lit? Check the level meters. If they are operating,
the problem is between the mixer and the later components
in the system. If there is no meter activity, 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.
7.2 Distorted Sound
Something is being overdriven in the signal path. If
the clip indicators are active, reduce the channel gain control
and/or press in the pad switch on the rear panel. If the output
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 prob-
ably several others in other system components which makes
it possible to overdrive an input section and then incorrectly
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.
7.3 Excessive Noise
If the noise is in the form of hiss, the problem is
usually due to an input stage set up for low gain and then
compensating by increasing the master gain. Check that the
Pad switch is not enabled unnecessarily. Turn up the channel
gain controls and reduce the master gain.
7.4 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. Use balanced input and output connections
between widely separated components.
If you need help, get in touch with your Ashly dealer
or call an Ashly technical service representative at 1-800-828-
6308.
Operating Manual - MX-206 Stereo Microphone Mixer

8. SPECIFICATIONS

INPUT IMPEDANCE
Mic input (balanced) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 .2k Ohm
DISTORTION
THD at +20 dBu, 20Hz-20KHz, input switch at -40dB . . . <0 .05%
IMD (SMPTE) at +20dBu, input switch at -40dB . . . . . . . <0 .02%
HUM & NOISE (20Hz-20KHz)
equivalent input hum and noise (input switch -60dB) . . <-128dBu
residual output noise, TRS outputs,
all levels at minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . <-100dBu
residual output noise, XLR outputs, . . . . . . . . . . . . . . . . . <-90dBu
Master Level at nominal,
all Ch . Level controls at min . . . . . . . . . . . . . . . . . . . . . . . <-84dBu
Master Level and one Ch . Level at nom . . . . . . . . . . . . . . <-80dBu
MAXIMUM VOLTAGE GAIN (±2dB)
Mic Input to Master Output, 600 ohm load . . . . . . . . . . . . . . . 84dB
Aux In to Master Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28dB
MAXIMUM INPUT LEVEL
Mic input (with pad) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +22 .3dBu
MAXIMUM OUTPUT LEVEL
Transformer output . . . +24 .2dBu @600 Ohm (+26 .7dBu no load)
Line output . . . . . . . . . . . . . . . . . . . . . . . +23dBu, RCA +13 .5dBu
FREQUENCY RESPONSE
20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0/-0 .5dB
CROSSTALK
Between any inputs or outputs
20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <-60dB
VU METERS
Two 5-segment LED meters . . . . . . . . . . . . . . . . . . . 0VU = +4dBu
PEAK INDICATORS
Peak Clip indicator on each input channel and left and right outputs,
illuminates 3dB below clipping
PHANTOM POWER
+48 VDC applied to all Mic Inputs, switchable on front panel . Maxi-
mum total current draw = 80mA . Maximum single channel current
draw = 14mA . Gradual power-up and down to eliminate "pops" .
WEIGHT
unit weight . . . . . . . . . . . . . . . . . . . . . . . .6 .8 lbs . (3 .1kg) maximum
shipping weight . . . . . . . . . . . . . . . . . .10 .1 lbs . (4 .58kg) maximum
DIMENSIONS
19"W (48 .3) by 9 .4"D (23 .9) by 1 .75"H (4 .45)
POWER REQUIREMENTS
100-240 VAC, 50-60 Hz, 30 Watts
*unless otherwise stated, specification conditions are: 150Ω
source, Input set at "-40", all other controls set at nominal,
XLR output into 600Ω or greater.
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