UC4
UNIVERSAL COMBO
OWNER’S MANUAL
The UC4 Universal Combo is just that: universal. Possible uses include keyboard amplifier,
acoustic guitar amplifier, powered monitor, self-contained P.A. system and many other uses. The
unique wedge shape and stand-mounting adapter allow the UC4 to be positioned in many
different ways to suit any performance or public address situation.
FRONT PANEL FEATURES
(Left to Right)
1.
INPUT 1 – 4: Controls the volume of sources plugged into channels 1 through 4. Start
with the Master Volume set as described in #8, and slowly bring each channel up to the
desired volume.
2.
EFFECTS 1 – 4: Controls the amount of each channel being sent to the internal
Accutronics reverb, as well the Effects Send jack on the rear panel.
3.
LO EQ CONTROL: Controls the frequencies below 125Hz. There is 15 dB of available
boost and cut, shelving type.
4.
LO MID CONTROL: Controls the lo-mid frequencies centered around 250 Hz. There is
15 dB of available boost or cut, peak/dip type.
5.
HI MID CONTROL: Controls the hi-mid frequencies centered around 1 kHz. There is 15
dB of available boost and cut, peak/dip type.
6.
HI EQ CONTROL: Controls the frequencies above 4 kHz. There is 15 dB of available
boost and cut, shelving type.
7.
REVERB MASTER: Master volume for the internal spring reverb return. This control
does not affect the external Effects Loop.
8.
MASTER VOLUME: Controls overall output volume of the UC4. Set this control to
approximately 12 o’clock to 3 o’clock for most live performance situations.
9.
HEADPHONE JACK: Used to connect external headphones. This jack is compatible
with headphones ranging from 8 to 600 ohm impedance.
10.
PHANTOM POWER SWITCH: 15 VDC Phantom power is applied to the XLR input jacks
when this switch is pushed in. Use a small screwdriver or similar object to operate the
switch. DO NOT OPERATE THIS SWITCH WHILE THE AMPLIFIER IS TURNED ON! A
VERY LOUD THUMP COULD OCCUR WHICH COULD DAMAGE THE SPEAKERS,
YOUR HEARING, OR BOTH!
11.
PHANTOM POWER LED: This yellow LED is illuminated when the Phantom Power is
on.
12.
POWER ON LED: This green LED is illuminated when power is applied to the UC4.
13.
POWER SWITCH: Applies mains power to the UC4 when in the UP “1” position.
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REAR PANEL FEATURES
(Left to Right)
1.
VOLTAGE SELECTOR SWITCH: Set the Voltage Selector Switch to correspond to your
local mains voltage. USA voltage is 115V.
2.
POWER INLET: Connect the appropriate power cord to the inlet, and then connect to a
properly wired, grounded power source. The AC mains fuse and a spare fuse are
located in the small compartment at the bottom of the inlet. Replace these fuses with the
same rating and type as indicated on the voltage chart on the left side of the chassis.
CAUTION: NEVER DEFEAT OR REMOVE THE GROUNDING PIN ON THE AC
CABLE. SERIOUS SAFETY HAZARDS COULD RESULT FROM THE REMOVAL OF
THE SAFETY GROUND.
2.
SPEAKER JACK: The speaker jack is used to connect the UC4 to the built in speaker.
NEVER CONNECT A LOAD THAT IS LOWER THAN 8 OHMS TOTAL IMPEDANCE TO
THE UC4. DOING SO COULD DAMAGE THE UNIT AND VOID THE WARRANTY.
3.
SPEAKER ON/OFF SWITCH: Used to switch the speaker on or off. Uses include silent
practice with headphones, or studio use.
4.
GROUND LIFT SWITCHES: These switches are used to eliminate ground loops when
the Direct Out and Preamp Out XLR jacks are used. The lift position disconnects pin 1 of
the XLR jack. Use the position that results in the least noise and hum.
5.
PREAMP OUT XLR JACK: This is a balanced, line level (0 dBm) XLR output. It is post
EQ, post effects and post Master Volume. It is normally used to drive an external power
amplifier, or as an additional high level direct output. This output is phantom power
protected.
6.
DIRECT OUT XLR JACK: This a balanced, microphone level (-40 dBm) XLR output. It is
pre EQ, pre effects and pre Master Volume. This output is normally used to send a
signal to a P.A. system or recording console. This output is phantom power protected.
7.
EFFECTS SEND: This unbalanced, ¼” jack sends a line level (0 dBm) signal from the
channel effects sends to an external effects device. This jack may also be used as an
additional line output.
8.
EFFECTS RETURN: This unbalanced, ¼” jack receives the signal from an external
effects device. Use the Input, Output and Mix controls on the external device to control
the relative level and wet/dry mix of the processed signal.
9.
BALANCED MIC INPUTS 1 – 4: These inputs accept standard, balanced XLR type
cables. Either dynamic or condenser low impedance microphones may be used. If using
condenser microphones, switch on the Phantom Power BEFORE turning on the power to
the UC4. DO NOT OPERATE THE PHANTOM POWER SWITCH WHILE THE
AMPLIFIER IS TURNED ON! A VERY LOUD THUMP COULD OCCUR WHICH COULD
DAMAGE THE SPEAKERS, YOUR HEARING, OR BOTH!
10.
INST. INPUT 1 – 3 AND LINE INPUT 4: These inputs accept standard, unbalanced ¼”
instrument cables. Channels 1 – 3 are for low level sources such as Hi-Z microphones,
most acoustic guitar pickups, and most keyboards. Channel 4 will accept high level
sources such as CD players, tape decks, some keyboards and some acoustic guitar
pickups with very hot preamps.
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TECHNICAL SPECIFICATIONS
OUTPUT POWER:
135 watts RMS continuous into an 8 ohm minimum load.
S/N RATIO:
Better than 90 dB.
HUM & NOISE:
Better than –65 dBv.
THD:
Less than .1%
INPUT IMPEDANCE
Balanced XLR Input:: 4.7k ohm for use with 150 – 600 ohm microphones.
Unbalanced Inst. and Line inputs: 47k ohm.
EQUALIZATION:
+ 15 dB @ 125Hz, 250 Hz, 1kHz and 4kHz.
REVERB TYPE:
Internal Accutronics spring.
HEADPHONE JACK:
8 ohm minimum.
EFFECTS SEND
1k ohms.
EFFECTS RETURN:
4.7k ohm.
SPEAKERS:
1 GBE1241B, 1 LeSon Tweeter.
SPEAKER STAND
ADAPTER
Fits standard 1 ½” speaker stands.
COOLING:
Internal fan cooled. Do not block air vents at front and rear of chassis.
DIMENSIONS:
23”H X 16”W X 15 ½”D
WEIGHT:
45 lbs.
BLOCK DIAGRAM
Genz Benz Enclosures, Inc.
7811 E. Pierce St. Scottsdale, AZ 85257
Ph: 480-941-0705 Fax: 480-946-2412
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