Ashly MX-406 User manual

MX-406
Stereo
Microphone/Line
Mixer
Operating Manual
ASHLY AUDIO INC.
847 Holt Road Webster, NY 14580-9103 Phone: [phone]
Toll-Free: [phone] Fax: [phone]
www.ashly.com
Treble
Bass
Clip
-12 +12
8
7
6
1
3
4
010
5
RL
8
7
6
1
4
Lev el
Pan
9
Channel 6
7
6
1
2
3
4
010
5
9
7
64
010
5
9
6
1
4
010
5
9
8
7
64
010
9
On Power
Phant m
Stereo
Headphones
MX-406
Stereo
Six Channel
Mic/Line Mixer
Mono/Phones
Output
Stereo
Outputs
Mono Phones
RightLeft
10
9
7
6
5
1
4
0
5
Stereo
Aux In put Aux Master Output
Aux
-6
Output
VU
-L- -R-
-9
-12
-15
-18
-21
-3
0
+3
+6
Clip
0
Treble
Bass
Clip
-12 +12
7
6
1
3
4
010
5
RL
8
7
6
1
4
Lev el
Pan
9
Channel
Aux
0
Treble
Bass
Clip
-12 +12
7
6
1
3
4
010
5
RL
8
7
6
1
4
Lev el
Pan
9
Channel 4
Aux
0
Treble
Bass
Clip
-12 +12
7
6
1
3
4
010
5
RL
8
7
6
1
4
Lev el
Pan
9
Channel 3
Aux
0
Treble
Bass
Clip
-12 +12
7
6
1
3
4
010
5
RL
8
7
6
1
4
Lev el
Pan
9
Channel 2
Aux
0
Treble
Bass
Clip
-12 +12
7
6
1
3
4
010
5
RL
8
7
6
1
4
Lev el
Pan
9
Channel 1
Aux
0
-40
-60
-20
-40
-60
-20
-40
-60
-20
-40
-60
-20
-40
-60
-20
-40
-60
-20 Input
(dB)
Input
(dB)
Input
(dB)
Input
(dB)
Input
(dB)
Input
(dB)

2
Operating Manual -MX-406 Stereo Microphone/Line Mixer
Table Of Contents
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 FRONT PANEL CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5 CONNECTORS AND CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 REAR PANEL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7 TYPICAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.1 Small Sound Reinforcement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.2 Meeting Room, Board Room, or Church Mixer Using Remote Control . . . . . . 9
8 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1 No Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.2 Distorted Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
8.3 Excessive Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.4 Excessive Hum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
11 WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
12 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-14

3
Operating Manual - MX-406 Stereo Microphone/Line Mixer
1. INTRODUCTION
Congratulations on your purchase of an Ashly
MX-406 stereo mic/line mixer, a professional, studio qual-
ity solution to everday mixing needs. MX-406 features
include six channels of mic or line inputs with mic input
pad, TRS insert points, and +48V phantom power. Each
channel has up to 60dB input gain, separate treble and
bass controls, an aux send control, level, and a stereo pan
control. An aux input is provided for a stereo program
source such as tape or CD. Outputs include aux master,
stereo line out (pre-master), stereo left and right, trans-
former balanced mono out, and stereo headphones. A
full 11 segment LED array indicates stereo output level.
Stereo main outputs use 1/4" jacks, stereo aux
input and line out use RCA connectors, and a transformer
isolated 600 ohm mono output uses an XLR connector.
Ashly mixers still use professional quality 16mm metal
shaft potentiometers for greater accuracy and long life
and of course,Ashly products come with a worry-free five
year warranty.
2. UNPACKING
As a part of our system of quality control, every
Ashly product is carefully inspected before leaving the
factory to ensure flawless appearance. After unpacking,
please inspect for any physical damage. Save the ship-
ping carton and all packing materials , as they were care-
fully designed to reduce to minimum the possibility of
transportation damage should the unit again require pack-
ing and shipping. In the event that damage has occurred,
immediately notify your dealer so that a written claim to
cover the damages can be initiated.
The right to any claim against a public carrier
can be forfeited if the carrier is not notified promptly and
if the shipping carton and packing materials are not avail-
able for inspection by the carrier. Save all packing mate-
rials until the claim has been settled.
3. AC POWER REQUIREMENTS
The MX-406 mixer will perform normally from
93 to 125 volts AC, 50-60Hz (some export models are
wired for 240 Volts and are labeled accordingly). Use
only properly grounded AC receptacles. To reduce the
risk of ground loop hum, use a central point for system
AC power distribution. In the event of fuse failure, refer
this unit to a qualified service technician for fuse replace-
ment using only the same type fuse. Power consumption
is less than 20 watts.
WARNING:
THIS APPARATUS MUST BE EARTHED
The exclamation point within an eqilate al
t iangle is intended to ale t the use to the
p esence of impo tant ope ating and
maintenance inst uctions in the lite atu e
accompanying the device.
The lightning flash with a owhead
symbol, within an equilate al t iangle, is
intended to ale t the use to the p esence
of uninsulated "dange ous voltage"
within the p oduct's enclosu e that may be
of sufficient magnitude to constitute a isk
of elect ic shock to pe sons. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT RE-
MOVE COVER. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK,
DO NOT EXPOSE THIS APPlIANCE TO RAIN OR MOISTURE.
TO REDUCE THE RISK OF FIRE, REPLACE ONLY WITH
SAME TYPE FUSE. REFER REPLACEMENT TO QUALIFIED
SERVICE PERSONNEL.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN

4
Operating Manual -MX-406 Stereo Microphone/Line Mixer
4. FRONT PANEL CONTROLS
4.1 Input Gain
This three position switch sets the operating level
of the microphone and line input preamp. The correspond-
ing switch values -20db, -40dB, and -60dB refer not to
the actual gain, but rather to the expected nominal input
signal strength.
Best signal to noise ratio is obtained with higher
gain settings. It is therefore desirable to set the gain con-
trol as high as possible while still leaving 20dB of head-
room for signal peaks. Line level inputs (1/4" jack) will
likely use a setting of -20dB, while mic inputs generally
require a setting of -40dB for close mic applications, and
-60dB for quieter signals. If a channel's clip LED is blink-
ing, first turn down that channel's level control. If the
clip LED is still flashing, turn down the input gain.
4.2 Clip
Input Clip LEDs are peak sensitive and monitor
all critical points within the input channel. The clip LED
turns on whenever any portion of the audio path within
the input channel reaches a level 3 dB below actual clip-
ping. Clipping in the MX-406 occurs at +20dB.
4.3 Treble/Bass
This concentric knob is used for broad EQ
changes to each input channel. Channel EQ consists of a
high shelf control (treble) at 4KHz, and a 250Hz low shelf
control (bass). EQ boost or cut is ±12dB.
4.4 Aux
The aux send is an additional level control used to
send signal from each input channel to monitors, an effect
unit, or another mix. The aux master output combines all
six channel's aux level signals. The aux control is factory
set to pre-fader, pre-EQ, but can be internally switched to
post-fader, post EQ. To make this change, refer the fol-
lowing procedure to a qualified service technician:
Unplug the unit's AC power cord from the outlet.
Remove the bottom cover which is fastened by seven 6-32
screws. Locate the 3 pin header labeledAUX at the middle
of the back edge of the front portion of the channel cir-
cuit board. Remove the shunt bar from the "Pre" position
indicated on the circuit board legend and place the shunt
on the "Post" position.
4.5 Level and Pan
This concentric knob adjusts the level and stereo
position of each channel. If a channel's level control is
always turned up to 9 or more, try increasing the gain
first. Conversely, if the level control is consistently turned
down to 1 or less, decrease the gain setting first. Re-
member that the gain setting should be set as high as pos-
sible while still allowing 20dB of headroom.
4.6 Stereo Line Input
This control adjusts the level of the RCA jack
stereo line input. It can be used for tape, CD, or DVD
audio inputs, and can also be used for a stereo effect re-
turn. For expanding the channel capacity of the MX-406,
Treble
Bass
Clip
-12 +1 2
8
7
6
1
3
4
010
5
RL
8
7
6
1
4
Level
Pan
9
Channel 6
Aux
0
Treble
Bass
Clip
-12 +1 2
7
6
1
3
4
010
5
RL
8
7
6
1
4
Level
Pan
9
Channel
Aux
0
Treble
Bass
Clip
-12 +1 2
7
6
1
3
4
010
5
RL
8
7
6
1
4
Level
Pan
9
Channel 4
Aux
0
Treble
Bass
Clip
-12 +1 2
7
6
1
3
4
010
5
RL
8
7
6
1
4
Level
Pan
9
Channel 3
Aux
0
Treble
Bass
Clip
-12 +1 2
7
6
1
3
4
010
5
RL
8
7
6
1
4
Level
Pan
9
Channel 2
Aux
0
Treble
Bass
Clip
-12 +1 2
7
6
1
3
4
010
5
RL
8
7
6
1
4
Level
Pan
9
Channel 1
Aux
0
-40
-60
-20
-40
-60
-20
-40
-60
-20
-40
-60
-20
-40
-60
-20
-40
-60
-20
Input
(d B)
Input
(d B)
Input
(d B)
Input
(d B)
Input
(d B)
Input
(d B)
8

5
Operating Manual - MX-406 Stereo Microphone/Line Mixer
the stereo line input can be used as stacking inputs for
supplementing the MX-406 with another mixer, such as
an Ashly LX-308 stereo line level mixer.
4.7 Aux Master Output
This control adjust the level of the aux master
¼" jack output, which gets it's signal from the six aux
level controls on the input channels. It is used for an
effects unit send, or can drive a power amplifier for moni-
tors or an extra loudspeaker zone.
4.8 Stereo Output Level
These two controls determine the signal level to
the ¼" jack left and right outputs. They are used to drive
power amplifiers for the main loudspeakers, or to con-
nect to a stereo recording device.
4.9 Mono Output Level
This control adjusts the level of the summed mono
output. It is completely independent of the main left and
right master controls. In other words, changes to either
left or right output level will not affect the mono output
level.
4.10 Headphones Level
This control adjusts the level of the stereo signal
to the headphone jack. Headphones should have an im-
pedance of 600 ohms or greater, or signal distortion may
result.
4.11 Output Meters
A pair of peak reading 10 segment LED meters
are used to indicate stereo output level in VU. 0 VU is
equivalent to +4 dBu (1.228Vrms).
Green LED's are used below 0 VU, yellow above
0VU and two red LED's indicate clipping. The clip LED's
turn on 3dB below actual clipping, detecting excessive
signal level on any critical audio path within the master
section. If all outputs are turned down and there is still
clipping, then one or more inputs must be turned down.
4.12 Phantom Power LED
The phantom power switch is on the back panel.
When the switch is pressed in, the LED is lit and +48VDC
is applied to all six mic inputs for use with condenser
microphones. If there is a mix of both condenser and
dynamic microphones, the phantom power will not affect
the operation of the most dynamic mics.
7
6
1
2
3
4
010
5
9
7
64
010
5
9
6
1
4
010
5
9
8
7
64
010
9
On
Power
Phant m
Stereo
Headphones
MX-4 06
Stereo
Six Channel
Mic/Line Mixer
Mono/Phones
Output
Stereo
Outputs
Mono Ph on es
RightLeft
10
9
7
6
5
1
4
0
5
Stereo
Aux Input Aux Master Output -6
Output
VU
-L- -R-
-9
-12
-15
-18
-21
-3
0
+3
+6
Clip

6
Operating Manual -MX-406 Stereo Microphone/Line Mixer
5. CONNECTORS AND CABLES
The MX-406 mixer is fitted with four types of
audio connectors: 3-pin XLR type male (mono output),
3-pin XLR type female (mic inputs), 1/4" tip-ring-sleeve
(TRS) phone jack, and RCA jack. Certain 1/4" jack con-
nections may use an unbalanced mono plug, which is also
shown.
Audio Connector Types
Tip (+)
Ring (-)
Sleeve (Gnd)
Stere Ph ne Plug
used f r balanced
2 = (+)
3 = (-)
1 = (gnd)
XLR pins are
numbered
n the
c nnect r
insert.
XLR Male
XLR Fem ale
Tip (+)
Sleeve (Gnd)
M n Ph ne Plug
used f r unbalanced
RCA Plug
(+)
(Gnd)
Two-conductor (twisted pair) shielded cable is
best for all XLR type connections. Belden No. 8412 or
its equivalent is an excellent cable due to its heavy con-
struction. This type of cable should be used for all por-
table applications. Snake cables containing multiple
shielded pairs must be handled very carefully because the
leads tend to be fragile, and a broken conductor is diffi-
cult to repair.
If low level and high level lines are run parallel
for long distances, crosstalk may occur. In fact, the
crosstalk (signal leakage between cables) can cause an
electronic feedback loop, oscillation, and possibly dam-
age 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 proxim-
ity to one another, they should be bundled separately. In
a permanent installation,avoid running speaker cables and
mic cable through the same conduit pipe.
6. REAR PANEL FEATURES
6.1 Microphone Input
The MX-406 microphone input is an active bal-
anced type with a nominal impedance of 1200 ohms. Its
noise performance is best with a 200 ohm microphone.
The Mic input connector is a standard 3-pin XLR female
with the shield on pin 1, the (+) in-phase connection on
pin 2, and the (-) out-of-phase connection on pin 3.
Stereo
Outputs
Right
Mono
Output
(Transformer
Bala nced)
Model MX-406
Made In USA
100-120VAC
0-60Hz 1 W
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
+48V
Phant m
P wer
Left
Aux
Master
Output
Stere
Line
Input
Stere
Line Out
-L-
-R-
Ch.
6
Tip=O
u
M
PUSH

7
Operating Manual - MX-406 Stereo Microphone/Line Mixer
6.5 Stereo Line Input
The stereo line RCA inputs have a nominal oper-
ating level of -10dBu to match most consumer audio
sources. This signal is controlled by the Stereo Line In-
put dial on the front panel. This input is also used as a
stereo effects return, or as a stacking input for adding
additional mixers.
6.6 Stereo Line Out
The stereo line outputs are nominal -10dBu "pre-
master", so they are not affected by the settings of the
main Left/Right output controls. These outputs would be
used for making a pre-output fader recording off of the
stereo mix, or for stacking the MX-406 stereo output into
another mixer.
6.7 Aux Master Output
The 1/4" jack aux master output is used to drive
a monitor or zone amplifier, effects processor, recording
device, or any function which requires level control inde-
pendent from the main stereo mix. It is pseudo-balanced,
which means that while it is a single ended signal, it has
balanced impedance for low noise when driving an active
balanced input circuit over a long distance.
6.8 Mono Output
The XLR mono output combines the left and right
stereo signals (pre output fader), and uses an isolation
transformer capable of driving 600 ohm lines. Pin 1 is
6.2 Input Pad
The input pad is a 20dB attenuation switch on
the rear panel for use with the XLR microphone inputs.
It should normally be left in the "out" position for best
signal to noise ratio and should only be used when the
input is being overdriven with the gain control at its mini-
mum setting.
6.3 Line Input
The line input is a standard 1/4" TRS active bal-
anced type found in the same "combo jack" connector as
the mic input. The line input balanced impedance is
20KΩ. It will accommodate a wide range of input levels.
6.4 Channel TRS Insert
A channel TRS insert patch point allows a de-
vice such as a remote level controller, graphic equalizer,
noise gate, compressor/limiter, or direct out recording
device to be used with one or more input channels.
The MX-406 TRS insert jacks use the tip for out-
put and ring for the returning input. These signals will
be unbalanced, so cable length should be at a minimum
to maintain low noise.
To use the TRS insert as a Direct Line Output
(pre EQ) for recording, you must make a special cable
with tip and ring connected at the MX-406 end and a tip-
sleeve mono plug at the other end. Connecting tip and
ring at the mixer insert jack is necessary for uninterrupted
signal within the mixer when using direct line outputs.
(-)(+)
2
3
1
-20dB Pad
(Mic Only)
6
Insert
ut R ing=In
Ch.6
M
ic/Line Input
-20dB Pad
(Mic Only)
Ch. Insert
Tip=Out R ing=In
Ch.5
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.4 Insert
Tip=Out Ring=In
Ch.4
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.3 Insert
Tip=Out R ing=In
Ch.3
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.2 Insert
Tip=Out R ing=In
Ch.2
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.1 Insert
Tip=Out Ring=In
Ch.1
Mic/Line Input
PUSH PUSH PUSH PUSH PUSH

8
Operating Manual -MX-406 Stereo Microphone/Line Mixer
ground, pin 2 is (+), and pin 3 is (-). This signal is determined by the mono output level control, with a nominal
operating level of +4dBu.
Note: The mono transformer-balanced output is designed to drive up to +24dBu into 600 ohm loads. Because
of the nature of an output transformer, the output level increases as the impedance of the terminating load becomes
higher than 600 ohms. Whereas a "direct-coupled" output stage like that of the right and left outputs will not change
as the load changes, any transformer used in an audio path is affected by its termination impedance. Since line level
inputs on audio devices are typically 10K
Ω or higher, expect a slight increase (2.5dB) in output level when driving
conventional active 10K Ω inputs with the transformer outputs.
6.9 Stereo Outputs
The 1/4" jack stereo right and left outputs are controlled by the left and right master. They are pseudo-
balanced TRS jacks with a nominal operating level of +4dBu into any load, and are capable of driving long lines.
6.10 +48V Phantom Power Switch
This switch applies +48VDC to all six XLR mic inputs to power condenser microphones. Phantom power will
not affect most dynamic mics, which may be used along with condenser mics.
7. TYPICAL APPLICATIONS:
7.1 Small Sound Reinforcement System:
In the setup shown here, the MX-406
is used to mix typical sound sources
that might be found in a church, small
club, school theater or similar environ-
ment. Four of the input channels are
used for vocal microphones, while the
remaining two channels are used for
stereo accompaniment tracks. The ste-
reo line input is used for additional
pre-recorded music such as that of a
movie soundtrack or CD player. Ste-
reo line output RCA jacks are used to
record the event to a cassette, video
camera, or even a PC with recording
capabilities.
Stage monitors are fed using the aux
mix to the master aux output, and left
and right outputs drive the main speak-
ers. The mono output drives a 70 Volt
distributed sound system amplifier,
used for plenum (ceiling) speaker in-
stallations.
MX-406
Microphone
Mixer
Four Vocal
Mic Inputs
EQ,
Limiter,
Crossover,
Amplifier,
etc.
(-)(+)
231
Stereo
Outputs
Right
Mono
Output
(Tran sf ormer
Bal a n c e d)
Mod el MX-406
Made I n USA
100-120VAC
0-60Hz 1 W
CAUTION
RIS K O F ELECTRIC SHOCK
DO NOT OPEN
+4 8V
Ph ant m
P wer
Left
Aux
Master
Output
Ste re
Li ne
Input
Ste re
Li ne Out
-L-
-R-
-20dB Pad
(Mi c Only)
Ch.6 Insert
Ti p =O u t R i n g=I n
Ch.6
Mic/Line Input
-20dB Pad
(Mi c Only)
Ch. I nsert
Ti p =O u t Ri n g=I n
Ch.5
Mic/Line Input
-20dB Pad
(Mi c Only)
Ch.4 Insert
Ti p =O u t Ri n g=I n
Ch.4
Mic/Line Input
-20dB Pad
(Mi c Only)
Ch.3 Insert
Ti p =O u t Ri n g=I n
Ch.3
Mic/Line Input
-20dB Pad
(Mi c Only)
Ch.2 Insert
Ti p =O u t Ri n g=I n
Ch.2
Mic/Line Input
-20dB Pad
(Mi c Only)
Ch.1 Insert
Ti p =O u t Ri n g=I n
Ch.1
Mic/Line Input
PUSH PUSH PUSH PUSH PUSH PUSH
Main
Right
(L)
MX-406 Small Sound Reinforecement System
Accompaniment Tracks
Cassette Player
(R)
(Aux) Monitor
Amplifier Monitor
Main
Left
VCR, CD, DVD Player
Audio Output
Recording
Device
(Stereo
Line Out)
70 Volt Distributed
Sound System Amp
(Stereo
Line Input)
(Mono
Output)
(Stereo
Outputs)

9
Operating Manual - MX-406 Stereo Microphone/Line Mixer
7.2 Meeting Room, Board Room, or Church Mixer Using Remote Control:
In this illustration, the MX-406 is interfaced with an Ashly VCM-88 eight channel remote level controller,
allowing the mixer to be operated from a distance by a non-technical person. Remote control of the VCM-88 is
achieved through the use of Ashly's RD-8 desk-top remote controller, RW-8 wall-plate version, or PC control using
Protea System Software. The RD-8 and RW-8 use a single mic cable for control data, while PC control uses RS-232
serial communications. Remote control can be located up to 1,300 feet from the main audio equipment rack.
8. TROUBLESHOOTING TIPS
8.1 No Sound
Check the AC power. Is the power switch on? 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 that you really
have an input signal and that it is on the desired channel.
8.2 Distorted Sound
Something is being overdriven in the signal path. If the clip indicators are active, reduce the channel gain
and/or press in the pad switch on the rear panel. 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 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.
100-120VAC
0-60Hz 1 W
Data Inp ut
2
3
1
DataV+
Ashly Audi Inc.
M d el VCX- 80
Made In US A
INPUTS are Acti ve Balanced ( Tip is +, Ring i s -) .
OU TPU TS Ma y Be Wir e d B al an c ed r Un bala nced .
**TRS Inserti n Is Available - See Owner's Manual**
Ch.2
DC C ontrol
Ch.8 Ch.7 Ch.6 Ch. Ch.4 Ch.3
Ch.1
InIn Out In Out In Out In Out Out In Out In Out
In Out
1 - Ch.1
2 - Ch.2
3 - Ch.3
4 - Ch.4
5 - Ch.5
6 - Ch.6
7 - Ch.7
8 - Ch.8
9 - Mas t er
10 - C ntr l CCW
11 - (Aux Gr und)
12 - C ntr l CW
13-14 - (Aux Data In)
15 - NC
1
9
Remot e Control
AVI S:
RIS QUE DE
CHOC ELECTRI QUE.
NE PAS OU VRIR.
1210
Pi n 1- 9
10K CW
** ** ** ** ** ** ** **
Master Out put
MX-406
Microphone
Mixer
(Single Jack
TRS Inserts Used)
RD-8 Remote Controller
With 3-Pin XLR Data Cable
VCM-88
Channels 1-6
Patched Into
MX-406 Channel
Insert Points
Channels 7-8
Used For Mixer
Output Control
Up To
Six Mic/Line
Inputs
(-)(+)
2
3
1
Stereo
Out put s
Le ft
Mono
Out put
(Tr a n sf o r m e r
Bal a n ce d)
Model MX- 4 0 6
Made In USA
100-120VAC
0-60Hz 1 W
CAUTION
RIS K O F ELECTRIC SHOCK
DO NOT OPEN
+4 8V
Ph ant m
P wer
Right
Aux
Mast e r
Out put
Ste re
Aux
Input
Ste re
Li ne Out
-L-
-R-
-20dB Pad
(Mi c Only)
Ch.6 In se r t
Ti p =O u t Ri n g=I n
Ch.6
Mic/Lin e In put
-20dB Pad
(Mi c Only)
Ch. In se r t
Ti p =O u t Ri n g=I n
Ch.5
Mic/Lin e In put
-20dB Pad
(Mi c Only)
Ch.4 In se r t
Ti p =O u t Ri n g=I n
Ch.4
Mic/Lin e In put
-20dB Pad
(Mi c Only)
Ch.3 In se r t
Ti p =O u t R i n g=I n
Ch.3
Mic/Lin e In put
-20dB Pad
(Mi c Only)
Ch.2 In se r t
Ti p =O u t Ri n g=I n
Ch.2
Mic/Lin e In put
-20dB Pad
(Mi c Only)
Ch.1 In se rt
Ti p =O u t Ri n g=I n
Ch.1
Mic/Lin e In put
PUSH PUSH PUSH PUSH PUSH PUSH
Speaker
Zone 2
+10
-70
+5
0
-5
-10
-20
-30
-50
-
-15
+10
-70
+5
0
-5
-10
-20
-30
-
-50
∞
-15
RD-8
R em ot e Lev el C ontr ol
XLR Data C n nect r
On T p r Back.
D N t Use
Transf rmer s.
Ch.1
On
Ch.2 Ch.3 Ch.4 Ch. Ch.6 Ch.7 Ch.8 Master
Rem te
Disabled
Gain (dB) Gain (dB)
V+
1
3
2
Data On
∞
Typical Application of MX-406 with VCM-88/RD-8 Remote Control
(L) (R)
EQ,
Limiter,
Crossover,
Amplifier,
etc.
Speaker
Zone 1
(L) (R)
(L)
(R)

10
Operating Manual -MX-406 Stereo Microphone/Line Mixer
8.3 Excessive Noise
If the noise is in the form of hiss, the problem is
usually due to an input stage set for insufficient gain and
then compensating for it by increasing the level. Try in-
creasing gain and reducing level. Also, check that the -
20dB rear panel pad switch is not unnecessarily enabled.
8.4 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 sev-
eral power outlets has many opportunities for this prob-
lem to occur. If possible, feed everything in the system
from one power source with a common ground. Use bal-
anced input and output connections between widely sepa-
rated components.
If you need help, get in touch with your Ashly
dealer or call an Ashly technical service representative.
9. DIMENSIONS:
6. 0
MX-406 Mixer
3.2
3. 0
0.00
0.2
0.00
0.2
18.7
19.00

11
Operating Manual - MX-406 Stereo Microphone/Line Mixer
10. SPECIFICATIONS
DISTORTION
THD at +4 dBu, 20Hz-20KHz . . . . . . . . . . . . . . . . . . <0.008%
THD at +12dBu, 30Hz-10KHz . . . . . . . . . . . . . . . . . . . <0.03%
IMD (SMPTE) at +12dBu . . . . . . . . . . . . . . . . . . . . . . . <0.03%
HUM & NOISE (20Hz-20KHz at max preamp gain)
equivalent input hum and noise . . . . . . . . . . . . . . . . .<-128dBu
residual output noise, TRS outputs,
all levels at minimum . . . . . . . . . . . . . . . . . . . . . . . . .<-110dBu
residual output noise, XLR output,
all levels at minimum . . . . . . . . . . . . . . . . . . . . . . . . . .<-98dBu
aux output, aux master and
all ch. aux at nominal . . . . . . . . . . . . . . . . . . . . . . . . . .<-90dBu
MAXIMUM VOLTAGE GAIN (±2dB)
MASTER
Mic/Line Input to Master Outputs . . . . . . . . . . . . . . . . . +92dB
Mic/Line Input to Mono Output, 600 ohm load . . . . . +88dB
AUX SENDS
Mic Input to Aux Master Output, pre ch. level . . . . . . . .72dB
Mic Input to Aux Master Output, post ch. level . . . . . . . 92dB
Stereo Line In to Master Output . . . . . . . . . . . . . . . . . . . .28dB
FREQUENCY RESPONSE
20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.5/-1.0dB
EQUALIZATION
Bass . . . . . . . . . . . . . . . . . . . . . . ±12dB at 70Hz, shelving
Treble . . . . . . . . . . . . . . . . . . . . . . ±12dB at 8KHz, shelving
CROSSTALK
adjacent inputs, 20Hz-20KHz . . . . . . . . . . . . . . . . . . . . <-65dB
VU METERS
Stereo outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -21 to +6 VU
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 rear panel.
Maximum total current draw = 80mA. Maximum single chan-
nel current draw = 14mA. Gradual power-up and down to elimi-
nate "pops".
SHIPPING WEIGHT
13 lbs.
POWER REQUIREMENTS
120 VAC nominal, 93 VAC minimum, 50-60 Hz,
20 watts (240 VAC available)
*unless otherwise stated, specification conditions are:
150 Ω source, Input Level set at "-60", all other controls
set at nominal, XLR output into 600 Ω or greater.
11. WARRANTY INFORMATION
Thank you for your expression of confidence in
Ashly products. The unit you have just purchased is pro-
tected by a five-year warranty. To establish the warranty,
be sure to fill out and mail the warranty card attached to
your product. Fill out the information below for your
records.
Model Number ________________________________
Serial Number _________________________________
Dealer ______________________________________
Date of Purchase_______________________________
Dealer’s Address _______________________________
Dealer’s Phone ________________________________
Salesperson ___________________________________

12 Operating Manual -MX-406 Stereo Microphone/Line Mixer
MX-406 Power and Metering
12345678
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size Drawn B
y
Rev.
A
S:\En
g
ineerin
g
\CLIENT98\5400\10s5401b.sch
xxx PCB
James B Franks
Sheet # of
11
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
[phone] [phone]
Print Date
26-Jul-2002
10:56:30
A->B @ 157%
C
$VKO\ $XGLR ,QF
210
311
4
512 7
8
L2
51P7106
out
SW1
AC SWITCH
out
SW2
120/240 SELECT
L
G
N
J3
ACINLET
D20
1N4003
D21
1N4003
D22
1N4003
D23
1N4003
C27
1000u
C28
1000u
In
1
2
Out 3
U6
7815
In
2
1
Out 3
U7
7915
D24
1N4003
D25 1N4003
C29
1.5u
C30
1.5u D26
1N4003
D27
1N4003 R98
2.4k
-15
D32
G
D33
R
D28
1N4003
D29
1N4003
R99
1.5K
R61
10
D30
1N4003
D31
1N4003
C33
100U
R7
10K R105 18K
R30
100K
D34
1N977
Q1
2N5401
R80
3.3K
Q2
2N5551
R24
220
Q3
2N5551
1
23
Q4
TIP29C
R107
22
D7
1N4148 C34
100U
+48
C35
.1U
C36
.1U C37
.1U
C38
.1U
R100
1.5K
+15
J4 J5 J6
23
1
SW3A
45P2600
OUT
5
6
4
SW3B
45P2600
F1
1/2 AGC
65VA
C
J7
AC-GND
EG
Q5
2N4123
Q6
2N4123
R109
390K
R66
2.4K R112
62K
C39
.1U
D35
R
R101
2.7k
SIG IN
5
MODE
9
RLO
4
RHI
6
REF ADJ
8
V+
3V- 2
REF OUT
7
LED10 10
LED9 11 LED8 12 LED7 13 LED6 14 LED5 15 LED4 16 LED3 17 LED2 18
LED1
1
LM3915
U10
LM3915
D37
Y
D39
Y
D41
Y
D43
G
D45
G
D47
G
D49
G
D51
G
D53
G
D55
G
+15M
R91
4.7K
D57
1N754
-15M
+15M
R67
9.09k
R115
33k
3
21
U8A
34184
D59 D60
R55
1K
R31
100K
R37
33K C31
1.5U
LEFT OUTPUT LEVEL (db)
Q7
2N4123
Q8
2N4123
R110
390K
R68
2.4K R113
62K
C40
.1U
D36
R
R102
2.7k
SIG IN
5
MODE
9
RLO
4
RHI
6
REF ADJ
8
V+
3V- 2
REF OUT
7
LED10 10
LED9 11 LED8 12 LED7 13 LED6 14 LED5 15 LED4 16 LED3 17 LED2 18
LED1
1
LM3915
U11
LM3915
D38
Y
D40
Y
D42
Y
D44
G
D46
G
D48
G
D50
G
D52
G
D54
G
D56
G
+15M
R92
4.7K
D58
1N754
-15M
+15M
R69
9.09k
R116
33k
12
13 14
U8D
34184
D61 D62
R56
1K
R32
100K
R38
33K C32
1.5U
RIGHT OUTPUT LEVEL (db)
+15M
RCLIP
LCLIP
LPOST RPOST
J20B
J20G
J20A J20H
J20C J20D J20E
J21B
J21G
J21A J21H
J21C J21D J21E
+15M -15M
-15M+15M
Meter Card
Power
Phantom
Phantom
GND
R138
0
+15M
R28
0
R29
0
R139
0
+15 +15M -15 -15M
HS1
HS2
HS3
1
2
3
4
5
6
J26
None
24VAC2
24VAC1
GND
35VAC2
35VAC1
24VAC2
24VAC1
35VAC1
35VAC2
AC
ACF
AC-SW
ACN
12. SCHEMATIC DIAGRAMS

13
Operating Manual - MX-406 Stereo Microphone/Line Mixer
MX-406 Motherboard Audio Sections
12345678
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size Drawn B
y
Rev.
A
S:\En
g
ineerin
g
\CLIENT98\5400\10s5400b.sch
xxx PCB
James B Franks
Sheet # of
11
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
[phone]
[phone]
Print Date
26-Jul-2002
10:53:20
A->B @ 157%
C
$VKO\ $XGLR ,QF
C1
47U
3
21
U1A
2043
C14
27P
R1
10K
D1
1N4148
D2
1N4148
C2
47U
R19
100
R2
10K
5
67
U2B
4560
C3
47U
5
67
U1B
2043
C15
27P
R3
10K
R34
33k
R40
6.8K
R45
2.7K
VR1
B10K
D3
1N4148
D4
1N4148
C4
47U
R20
100
R4
10K
C5
47U
R48
2K R53
1K
R57
15K
C6
47U
R59
10
3
21
U3A
4560
R5
10K
R6
10K
R60
10
2 7
3 6
L1
51P9010
R65
2.4K
R58
15K
C7
47U
R49
2K R54
1K
5
67
U8B
34184
C16
27P
C8
47U
R72
22K
R78
3.3K R87
4.7K
VR5A
B20K
10
98
U8C
34184
C17
27P
C9
47U
R73
22K
R79
3.3K R88
4.7K
VR5B
B20K
R93
68
3
21
U5A
2043
R143 18K
VR3B
C100K
R96
62K C25
10pf R94
68
J1
47P3151
R21
100
R22
100
HEADPHONE
OUTPUT
RIGHT
OUTPUT
MONO
OUTPUT
LEFT
OUTPUT
LCLIP
RCLIP
D5
1N4148
D6
1N4148
LCLIP
LEFT MASTER LEVEL
MONO MASTER LEVEL
RIGHT MASTER LEVEL
HEADPHONE LEVEL
STEREO AUX INPUT
5
4
J2A
47P1304
6
4
J2B
47P1304
3
1
J2D
47P1304
2
1
J2C
47P1304
1
32
J8
9
3
5
11
7
1
B
J9A
10
4
6
12
8
2
T
J9B
RBUS
LBUS LPRE
RPRE
LPOST
RPOST
Mono+
Mono-
LBUS
RBUS
114
213
312
411
510
6 9
7 8
J11
DIP14
-15M +48
+15M -15
+15
AUX
RBUS
LBUS
GND-METER
C18
27P
3
21
U2A
4560
R35
33k
R41
6.8k
R46
2.7k
VR2
B10K
C19
27P
5
67
U3B
4560
R108
8.2k
R106
18K
R50
2k
VR3C
B10K
C20
27P
5
67
U4B
34184
R8
10K
R9
10K
RPRE
3
21
U4A
34184
R10
10K
R11
10K
LPRE
12
13 14
U4D
34184
C21
27P
R12
10k
R13
10k
10
98
U4C
34184
C22
27P
R14
10k
R15
10k
5
67
U5B
2043
R14418K
VR3A
C100K
R97
62K C26
10pf
3
21
U9A
4560
C10
47U
5
67
U9B
4560
C23
27P
R16
10K
R36
10k
R42
10K
R47
1.5K
VR4
B10K
C11
47U
R25
100
R17
10K R26 100
AUX MASTER LEVEL
J10
47P3151
AUX AuxPre AuxPost
C24
27P
RPRE
LPRE
D8
1N4148
D9
1N4148
D10
1N4148
D11
1N4148
LCLIP
RCLIP
RCLIP
J13 R74
None C12
NoneLBUS
J14 R75
None C13
NoneRBUS
-L
-
SUB I
N
-R-
AUX
OUTPUT
STEREO LINE OUTPUT
LEFT
RIGHT
MX406 Power and LEDs
10s5401b.sch
MX406 Input Channel
10s5402b.sch
BKT3
J22
None
J23
None
J24
J25
C68
None
C69
.1U C70
.1U C71 .1U C72 .1U C73 .1U C74 .1U C75 .1U C76 .1U
+15 -15
R140
0
R141
None
R142
None
C77
.001U +16.5dB Max, +5.6dB Mid
+12dB Max, +1.6dB Mid
+8dB Max, -4.2dB Mid
R89 4.7K
R90 4.7K
+11.7dB Max, -1.5dB Mid
+20.2dB Max
Right
Left

14 Operating Manual -MX-406 Stereo Microphone/Line Mixer
MX-406 Input Channel
12345678
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size Drawn B
y
Rev.
A
S:\En
g
ineerin
g
\CLIENT98\5400\10s5402b.sch
xxx PCB
James B Franks
Sheet # of
11
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
[phone]
[phone]
Print Date
26-Jul-2002
10:55:31
A->B @ 157%
C
$VKO\ $XGLR ,QF
R43
6.8K R44 6.8K
C48
.001U C49
.001U
R118
160
R119
620
R120
620
+48
D12
1N4148 D13 1N4148
D14
1N4148 D15 1N4148
C41
.1U
C42
.1U
R62
10
R63
10
R121 560
R122 560
R64 10
R81 3.3K
R125
5.90K
R126
5.90K
C50
3300U
C51
None
Q10
2N4125
Q11
2N4125
C52
None
C53
None
C54
100P
C55
100P
R129
2.55K R130 2.55K
-15
R131
2.55K R132 2.55K
3
21
U12A
4560
3
21
U13A
4560
R127 5.90K
C56 100P
C57
100P
R128
5.90K
+15
4
5
6
VR7B
B20K
R70 2k
R39
33k
R117
3.3k
D16
1N4148
1
2
3
VR7A
B5K
R82
3.3K
R83
3.3K
R84
3.3K
R85
3.3K
Q12
2N4125
Q13
2N4125
C43
.1U
R71
2.4K
R114
62K
R111
390K D63
R
-15M
C60
47U/63V
C61
47U/63V
-20dB PAD
MIC INPU
T
LEVEL PAN
MIC GAIN
RBUS
LBUS
2
3
1
SW5A
5
6
4
SW5B
R103
2.7k
Out
Out
J15
R76
22k
R77
22k
R27
100
R18
10k
5
67
U12B
4560
C62
47u
R33
100k
LINE
INPUT
INSERT
POINT
VR8B
B20k
VR8A
B20k
C65
.033u
R123
470
R124
470
R51
2.7k R52 2.7k
C66
.22u C67 .22u C58
100p
5
67
U13B
4560
D17
1N4148 D18
1N4148
LOW
HIGH
C59
100p
EQ
D19
1N4148
J16 VR9
B10K
R86
3.3k AUX
Q14
None
Q15
None
R133
None
R134
None
R135
None
D64
None
-15M
R104
None
C63
None
Q9
None
C64
None
R95
None
R136
None
+15M
SIGNAL
CLIP
Pre
PostSig
AUX SEND
J17A
J17B
J18A
J18B
J17D J18D
J17E J18E
J17F J18F
J17C J18C
+15
-15
+48
+15
-15
+48
+15
J17G J17H
J18G J18H
PEAKBUS
114
213
312
411
510
6 9
7 8
J12
DIP14
-15M +48
+15M -15
+15
AUX
RBUS
LBUS
GND-METER
Break-Away Back Panel PCB Front Panel Panel PCB
PRE
POST
3
21
G
J19A
JACK-COMBO
J19B
JACK-COMBO
BKT1
BRKT-GND
BKT2
BRKT-GND
R137
None
+20dB Max, +9.4dB Mid
+20dB
+40dB
+60dB
SW6A
EG
C44
.1U C45
.1U
C46
.1U
C47
.1U
-.2dB Center

15
Operating Manual - MX-406 Stereo Microphone/Line Mixer

Printed in USA MX406 Rev 0 0802
ASHLY AUDIO INC. 847 Holt Road Webster, NY 14580-9103
Phone: [phone] Fax: [phone]
Toll Free [phone]
www.ashly.com
 2002 by Ashly Audio Corporation. All rights reserved worldwide.
Operating Manual -MX-406 Stereo Microphone/Line Mixer