wheelock MX-8 Mixer INSTALLATION INSTRUCTIONS
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.
P83241 C
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1. UNPACKING:
The mixer was carefully checked before leaving the factory. Inspect shipping container and unit carefully for indication of
improper handling. If the unit has been damaged, make an immediate claim to the carrier.
2. MOUNTING INSTRUCTIONS:
The mixer is provided with five mounting feet for placement on a shelf. An optional Rack Mount Kit (PA-RMK) is available
for mounting in standard EIA 19” racks. Refer to PA-RMK installation instructions (P83258) for mounting.
CAUTION: These devices are not intended for use 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 electric outlet. It is very
important to maintain the mixer ground for safe and trouble-free operation. If there is no grounded electric outlet, connect earth
ground of the AC line cord to a water or steam pipe.
4. POWER SWITCH AND RECEPTACLE (SEE FIGURE 1):
The ON/OFF power switch located on the rear panel controls both the internal power of the mixer and the accessory IEC female
outlet.
Note: The accessory to be attached and controlled by the ON/OFF switch must not exceed 3 Amps at 115VAC.
5. SPECIFICATIONS:
Figure 1: Power Connections
P83241 C
Sheet 2 of 9
Table: 1
Description MX-8 Tolerance Comments
Inputs (1) Telephone (4) MIC (3) AUX ------ ------
1. Impedance 600 Ohms 600 Ohms 47K Ohms
2. Sensitivity
3. Frequency
Response
4. Signal to Noise
Ratio
5. Type
of Input
6. Controls
(-16dBM)
125mV
5mV
225mV
150Hz-15KHz 20Hz-20KHz 20Hz-20KHz
65dB
Transformer
Isolated/Bal.
65dB
Balanced or
Unbalanced
70dB
Unbalanced
Level Control: (1) TEL/MIC5 (4) MIC (3) AUX
BASS, TREBLE, MASTER GAIN
------
TEL ± 2dB
MIC ± 1.0mV
AUX ± 20%
±2dB
- 3dB
------
at 1KHz
To Produce
Rated
Output
Ref. 1KHz at .1V
-3dB Roll-Off
“No Hum”
------
Front
Panel
LIMITER Select Switch, LO-CUT Switch Front
TEL/MIC5 Select, PRE/POST EQ Switch Rear Panel
7. Indicators Green LED - Power On, Red LED - Input Peak Indicator
Output Peak Indicator
Front
Panel
8a. Treble Control -12dB to +12dB at 10KHz ± 3dB Ref 1kHz at .1V
8b. Bass Control +12dB to -12dB at 100Hz ± 3dB Ref 1kHz at .1V
9. Lo-Cut Switch -6dB at 250Hz ± 1dB ----- Automatic
10. Limiter
for Paging
Automatic
11. Mute
Operation
12. Total Harmonic
Distortion (THD)
Outputs from
13. Mixer
± 2dB Output Level Maintained Without
Clipping, While Exceeding
Rated Input Level Up to 20dB.
40dB Muting of AUX 1
with Nominal MIC or TEL Input
1%
LINE OUT: ≥ 1V at RL = 150
Ohms
PATCH OUT: ≥ 1V at RL 150 Ohms
TAPE OUT: -10dB from PATCH
------
------
± 1%
± 10%
------
Mute of Music Output
While Page
is Activated
Rated Output
at 1KHz
Line Out - Selectable
PRE/POST-EQ
PATCH OUT = PRE-
EQ
OUT
14. RFI Protection RFI Test: Use CB Transmitter Output
in Same Room - Minimum 20 Ft. from
------
------
Amplifier - No Pickup
15. Environmental 0 Degrees C-49 Degrees C
85% R.H. Noncondensing
------
------
16. Input Power 90V-132VAC 50/60Hz Power Factor Corrected Universal Input
17. Consumption 25 Watts Max ------ ------
18. Weight 12.6 lbs. ------ ------
19. Dimensions 3.5"(H) 16"(W) 14"(D) ------ Rack Mount 19"(W)
20. FCC Part 15 ------ ------
21. UL 813 ------ ------
22. CSA (Pending) CAN/CSA C22.2 No. 1-M-90 ------ ------
6. TELEPHONE PAGING INPUT (SEE FIGURE 2):
Connect telephone paging interface wires to the input screw terminals marked TIP (+) and RING (-). Set MIC 5/TEL Switch
(rear panel) to TEL position. For Tip and Ring connections to various types of telephone paging access, see Figures 6A, B & C.
For Tip and Ring connections to Wheelock Zone Controls, refer to the specific zone control installation instructions.
P83241 C
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