Instruction gt60-correctionA
Instruction Kit
GT 60C
GT 125C
MIXER AMPLIFIER
GROMMES-PRECISION
1-800-SINCE-46
www.grommesprecision.com
Thank you for purchasing from Grommes~Precision!
Grommes~Precision and its commercial audio division, Precision Electronics, has been
designing, engineering, and manufacturing quality sound equipment in the United States
since it started operation in March of 1946. Over a half a century of quality, service, and
flexibility as “Your Personal Manufacturer” have made us one of the last American audio
manufacturers. If you have any questions with this or any one of our other fine products, give
us a call. When you talk with a member of the Grommes~Precision team you’ll be speaking
with someone who had a hand in concept, design, production, or testing of this very product.
INSPECTION
This unit was carefully checked and packed before leaving the factory. However, it is always a good idea to
inspect the shipping container and unit for indication of improper handling. If the unit has been damaged,
make an immediate claim to the dealer or distributor from whom it was purchased. If the unit was shipped to
you, notify the transportation company without delay, saving all packing materials, in order to process the
claim.
INITIAL PERFORMANCE CHECK
Continue the inspection by running a performance check. Connect a test speaker to the 4-8 ohm direct output
terminals (see page 6) and a tuner, tape deck, or CD player to the auxiliary input and set the controls for
operation. CAUTION: TO PROTECT THE SPEAKER FROM DAMAGE, DO NOT TURN THE UNIT ON UNTIL
ALL CONNECTIONS HAVE BEEN MADE. IN ADDITION, MAKE SURE THE UNIT IS GROUNDED BEFORE
TESTING. If the unit should be inoperable and no damage is noted, please notify the factory at 1-847-599-1799
and ask for Technical Support.
RACK MOUNTING
For best results use a 10-32 class UNF-2B or 12-24 class UNC-2B rack and 0.625 inch machine screws
(metric: M5X8-6H or M6X1-6H, 15.88mm). It is recommended that the drive of these screws be phillips in order
to protect the finish from unnecessary scratches. Also recommended are nylon or plastic washers which will
not only help protect the finish but also aid in retaining the screws.
CONVECTION, FAN COOLING, AND VENTILATION
This unit is cooled via convection and therefore designed for continuous operation. Do not block the unit’s
heatsink fins or vent holes located in the cover. If the unit will be rack mounted, you must utilize a cooling fan
that is capable of exhausting not less than 300CFM. The fan must be mounted to the inside top of the rack,
above the amplifier.
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800-SINCE-46
TECHNICAL SUPPORT
A troubleshooting chart is located at the end of this manual for your convenience. If you are in need of further
assistance, you can reach our design engineers at 1-847-599-1799. Grommes~Precision is based in Gurnee,
Illinois and is on Central Standard Time. Our hours of operation are Monday - Friday from 7:00am to 3:30pm.
Troubleshooting information can also be found at our website www.grommesprecision.com.
GENERAL INSTALLATION
DO NOT run microphone cables near A/C lines, data, telephone or 70V line cables.
DO NOT run outputs line cable near data, telephone or other low voltage cables.
ENSURE that all loudspeakers are in-phase.
ENSURE that there are no short circuits on the loudspeaker line before connecting to the amplifier.
FRONT PANEL DESCRIPTION
1. Channel 1 Volume Control
7. Treble Control
2. Channel 2 Volume Control
8. Master Volume Control – Volume control for
entire system
3. Channel 3 Volume Control
9. Power Switch
4. Channel 4 Volume Control
10. Power Indicator - LED
5. Channel 5 Volume Control
11. Output Level Indicator LED
6. Bass Control
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REAR PANEL DESCRIPTION
1. IEC Socket – Used for A/C Line Interconnect
19. MIC 2/Aux 2 Selector Switch*
2. Circuit Breaker – For Amplifier
20. Aux 2 Input (RCA Jack)
3. Earth Ground Connection Screw
21. Aux 1 Input (RCA Jack)
4. Power Amplifier Input (RCA Jack)
22. MIC 1/Aux 1 Selector Switch*
5. Pre Output
23. MIC 1 Input (XLR Jack)
(RCA Jack)
6. Tape Output (RCA Jack)
24. Convenience Outlet
7. Aux 6 Level Control
25. Circuit Breaker – For Convenience Outlet
8. Aux 6 Input (RCA Jack)
26. Supply Voltage (115V/230V) Selector Switch
9. Aux 5 Input (RCA Jack)
27. Speaker Output Terminals
10. MIC 5/Aux 5 Selector Switch*
28. DC Power Supply Terminals
11. MIC 5 Input (XLR Jack)
29. MIC 5 Input (Screw Terminals)
12. MIC 4 Input (XLR Jack)
30. MIC 4 Input (Screw Terminals)
13. MIC 4/Aux 4 Selector Switch*
31. MIC 3 Input (Screw Terminals)
14. Aux 4 Input (RCA Jack)
32. MIC 2 Input (Screw Terminals)
15. Aux 3 Input (RCA Jack)
33. MIC 1 Input (Screw Terminals)
16. MIC 3/Aux 3 Selector Switch*
34. Tel Page Input (Screw Terminals)
17. MIC 3 Input (XLR Jack)
35. Tel Page Level Control
18. MIC 2 Input (XLR Jack)
36. MIC 1 Mute Switch – Mute On enables mute of Chl. 1 over
Chls. 3-6
* Switch selects between RCA Line inputs and Microphone level, either screw or XLR input.
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POWER SOURCE
VAC
The supply transformer has been designed for use on either 115V or 230V, 50-60Hz, selected by slide a switch
on rear panel. The amplifier is factory set at 115V.
Battery Connection (24Vdc)
When using external DC source, ground the amplifier via the screw terminal. (Electrical stability of the system
will be increased by providing a good earth ground.) NOTE: The connection to the unit must be fitted with an
in-line fuse. [Quick blow type 8A.] Please ensure correct polarity.
MICROPHONE CONNECTION
Mic1~5 inputs are balanced standard XLR Jack and screw terminal, rear panel.
MUTING
The TEL input has voice activated (VOX priority) muting over, CH1~CH5 and AUX 6.
Microphone 1 input has VOX priority over CH 3~6 and Line input signals but does NOT mute Channel 2 input.
LINE (AUX) CONNECTION
The equipment provides an auxiliary input which may be used for connecting other signal sources such as a
Radio Tuner, CD, or Cassette player. A switch is located on the rear panel for selection of, Mic1→Aux1, Mic2
→Aux2, etc. The Aux input is a dual RCA phono jack and has a stereo to mono converter for each channel.
RCA Phono plug connection
Sleeve-Shield
Pin-
PIN
SLEEVE
Signal
TAPE OUTPUT CONNECTION
These RCA /phono jacks provide a mixed output suitable for connection to a tape or cassette recorder.
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PRE OUT / AUX OUT
This horseshoe jumper “U” connects the mixer-preamplifier stage to the power amplifier stage. The connecting
link must be plugged in for normal operation as a mixer-amplifier. “PRE OUT” is after the tone controls and the
master volume control.
POWER AMP IN
The power amp input is not controlled by the master volume and tone controls, when the RCA plug “U” jumper
has been taken out.
Connecting the Mixer Amplifier to a Power Amplifier or other Accessory equipment:
This amplifier can be connected to accessory equipment by using phono to phono leads from the mixer
amplifier “PRE OUT (1)” to the accessory gear and back to the “POWER AMP IN” RCA jack. Further, more
power amplifier can be obtained by connecting from the “PRE OUT (2)” output to another power amplifier.
Under normal conditions, up to three power amplifier can be connected in this way.
LOUDSPEAKER CONNECTION
Use only 70V or 25V Line Loudspeakers and connect to the appropriately marked screw terminal on the output
strip.
LOW IMPEDANCE 8Ω or (4Ω):
This output allows connection of standard low impedance loudspeakers, the minimum load impedance must
be 8Ω or (4Ω), when two or more loudspeakers are in use ensure that they are wired in such a way that the load
impedance is between 4Ω and 16Ω.
Series GT 60 and GT125 Technical Specifications
Type
Mixer Amplifier
Model
Supply
GT 60C
GT 125C
Mains Voltage
AC 115V/ 230V, 50 / 60Hz ± 10% Switchable
Battery Voltage
DC 24V (MAX 10% deviation)
Output power Rated:
60W
Output
Speaker outputs: 4Ω, 8Ω, 25V, 70V
125W
Tape output: 1V, 4.7KΩ
Pre output: 1V, 600Ω
Power outline, 5A/115V (comply with IEC input)
Inputs
Mic 1~5: 1mV, 600Ω balanced
Aux 1~6: 150mV, dual RCA – stereo to mono converted 22K
TEL 150mV, 600Ω balanced
Power amp in: 1V
Frequency response
Mic 1~Mic 5: 60Hz ~ 15KHz ± 3dB
Aux 1~ 6: 50Hz ~ 20KHz ± 3dB
TEL: 50Hz ~ 15KHz ± 3Db
Power amp in: 50Hz~15KHz± 3Db
Total harmonic distortion
Less than 1% at 1KHz, rated power
Signal to noise ratio
Mic 1~ 5: 60dB below rated power
Aux 1-5: 60dB below rated power
Aux 6: 80dB below rated power
Tone Controls
Bass: ± 10dB at 100Hz
Treble: ± 10dB at 10KHz
Controls
Channel1~5 volume control
Aux 6 volume control
Master volume control
Tone controls (Bass, Treble)
TEL volume control
Mute slide switch
Mic 1/Aux 1 push switch
Mic 2/Aux 2 push switch
Mic 3/Aux 3 push switch
Mic 4/Aux 4 push switch
Mic 5/Aux 5 push switch
AC 115V / 230V voltage Selector switch
Indicators
Power indicator (LED), output level indicators (3 LEDS)
AC power consumption
150W
300W
DC power consumption
5A
8A
Phantom power
Factory set 16V
Defeat-able via internal jumpers.
Priority
Priority level (Using for Mic1 ~ 4, the 5 pole PHONE connector)
TEL can mute all channel
Channel 1 can mute Channel 3 ~5, Aux 3~6
Dimensions ( H x W x D )mm
17”W x 3.5”H x 13.5”D
Weight
17LBS
19LBS
Color
Black
Mounting options
Table top or 19” rack mountable / Rack Mount Ears Included
Rev. A
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847-599-1799
F: 847-599-6178
800-SINCE-46
IMPORTANT
As the colors of the wires in the mains lead of
The wires in the mains lead are colored
this apparatus may not correspond with the
In accordance with the following code:
colored markings identifying the terminals in
your plug proceed as follows:
The wire which is colored green and yellow
Green and Yellow:
Earth (E)
must be connected to the terminal which is
marked with the letter N or colored black. The
Blue:
Neutral (N)
wire which is marked with the letter L or colored
red.
Brown:
Live (L)
If a 13 Amp (B.S.1363) plug or any other type
of plug is used, a 5 Amp fuse must be fitted
either in the plug or at the distribution board.
WARNING:
THIS UNIT MUST BE EARTH GROUNDED
Rev. A
GROMMES-PRECISION
7
847-599-1799
F: 847-599-6178
800-SINCE-46
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