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P83241 C 

Sheet 1 of 9 

 

273 Branchport Ave. 
Long 

Branch, 

N.J. 

 

07740         

Thank you for using our products. 

(800)  631-2148 
www.wheelockinc.com 

INSTALLATION INSTRUCTIONS 

MODEL MX-8 MIXER 

 

Use this product according to this instruction manual.  Please keep this instruction 

manual for future reference. 

 
 

GENERAL: 
 

The MX-8 Mixer is an eight channel audio mixer designed to drive power amplified speakers in a telephone paging application or as 
the input mixer for a commercial PA system.  The MX-8 offers a choice of ten different inputs:  five low impedance microphone 
inputs, one telephone paging input, three high impedance auxiliary inputs and one PATCH IN  input.  The MX-8 allows eight of these 
inputs to be used simultaneously:  four microphone inputs, a choice of a telephone paging input or a fifth microphone input, and three 
auxiliary inputs. 
 
The front panel of the mixer features individual input level controls; as well as, MASTER gain and TREBLE / BASS controls, LO 
CUT horn protect switch,  LIMITER (ALC) ON/OFF switch, power ON indicator, INPUT PEAK indicator for the eight input 
channels, and an OUTPUT PEAK indicator. 
 
A built-in LIMITER circuit compensates for the varying voice levels and paging styles of the people who have access to telephone 
paging or a microphone input.  The LIMITER maintains rated output without distortion when input level exceeds rated input by as 
much as 20dB.  The LIMITER circuit affects only the MIC and TEL inputs. 
 
Note that (AUX 1) auxiliary input (i.e., background music, tone generator, etc.) will automatically be soft muted whenever a 
telephone page or a microphone page is generated.  After completion of the page, the music will return to its original level. 
 
On the rear panel, there is a power ON/OFF switch with a switched auxiliary AC receptacle, as well as a MIC 5/TEL select switch 
and a PRE/POST EQ select switch for the LINE OUT. 
 
All inputs and outputs are connected to the rear panel.  Screw terminals are used for the Microphone and Telephone Inputs.  Phono 
jacks are used for auxiliary inputs, LINE OUT, TAPE OUT, PATCH OUT and PATCH IN. 
 
The mixer operates from 115VAC, 60Hz and has a power consumption of less than 25 watts.  

There is no external fuse or circuit 

breaker

.  IN THE EVENT THE MIXER DOES NOT POWER UP, HAVE THE TROUBLE INVESTIGATED BY AN 

AUTHORIZED SERVICE TECHNICIAN OR RETURN UNIT TO FACTORY. 
 

NOTE

:  READ THESE INSTRUCTIONS CAREFULLY.  FAILURE TO COMPLY WITH ANY OF THE FOLLOWING 

INSTRUCTIONS, CAUTIONS AND WARNINGS COULD RESULT IN RISK OF ELECTRICAL SHOCK, IMPROPER 
APPLICATION OR INSTALLATION. 
 

NOTE:

  All 

CAUTIONS

 and 

WARNINGS

 are identified by the symbol 

.  All warnings are printed in bold capital letters. 

 

WARNING:  TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN 

OR MOISTURE.

 

 
 
 
 
 
 
Copyright 1996 Wheelock, Inc.  All rights reserved. 

 
 

Summary of Contents for MX-8 Mixer

Page 1: ...d output without distortion when input level exceeds rated input by as much as 20dB The LIMITER circuit affects only the MIC and TEL inputs Note that AUX 1 auxiliary input i e background music tone ge...

Page 2: ...in hazardous locations as defined by the National Electrical Code NEC 3 POWER AND GROUNDING SEE FIGURE 1 The 115VAC line cord has a three prong plug which should be plugged into a three wire grounded...

Page 3: ...Rated Input Level Up to 20dB Automatic 11 Mute Operation 40dB Muting of AUX 1 with Nominal MIC or TEL Input Mute of Music Output While Page is Activated 12 Total Harmonic Distortion THD 1 1 Rated Outp...

Page 4: ...H IN AND TAPE OUT SEE FIGURE 2 The PATCH OUT signal is the mixed audio signal before the TREBLE BASS and MASTER gain controls of the mixer The TAPE OUT signal is the same as the PATCH OUT but reduced...

Page 5: ...25 for additional inputs with 125 Watts of power Note Use shielded cable for all interconnections Note The LINE OUT signal can be selected to be output prior to or after the TREBLE BASS controls PRE P...

Page 6: ...Note Maximum primary DC current not to exceed 10mA for telephone input Refer to Wheelock TPI 100 installation instructions P82030 for internal control settings and adjustments CAUTION Connect only to...

Page 7: ...he mixer is approaching clipping of the audio signal 19 INPUT PEAK INDICATOR The INPUT PEAK indicator will illuminate as the input of any of the eight audio channels approach clipping If any of the pa...

Page 8: ...d to the right selects POST EQ Note Set PRE POST EQ in POST EQ position to ENABLE MASTER gain control 28 PATCH OUT TAPE OUT AND PATCH IN PHONO JACKS The PATCH OUT is the mixed audio signal at line lev...

Page 9: ...WHETHER IT WILL ACHIEVE THE USER S INTENDED RESULTS THERE IS NO WARRANTY AGAINST DAMAGE RESULTING FROM MISAPPLICATION IMPROPER SPECIFICATION ABUSE ACCIDENT OR OTHER OPERATING CONDITIONS BEYOND WHEELOC...

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