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GPA SERIES POWER AMPLIFIERS
INTRODUCTION:
Congratulations on purchasing a G
GPA S
EMINI
This state of-the-art power amplifier includes the latest features & is backed
by a
year limited warranty. Prior to use, we suggest that you careful-
THREE
ly read all the instructions.
FEATURES:
- 30 Hz to 50 kHz frequency response, <0.05% THD (0.02% typical)
- High output power to drive professional loudspeakers without clipping
- Comprehensive protection circuitry with protect LED indicator
- ¼" TRS & XLR balanced/unbalanced inputs
- Speakon & ¼" speaker outputs
- Three modes of operation - stereo, parallel mono, and mono bridge
- Ground lift switch
- Decibel (dB) level meter with clip LEDs
- Subsonic and ultrasonic filters for better protection and more efficient
operation
- Aluminum extrusion heat sink design with directly mounted output tran-
sistors for no-fault operation
- Air guide with front-to-rear airflow and cooling fan for thermal stability
and reliability
CAUTIONS:
1. Read all operating instructions before using this equipment.
2. To reduce the risk of electrical shock, do not open the unit. There are
. Please contact the G
N
U
R
P
I
O
SER
EPLACEABLE
ARTS
NSIDE
D
or your authorized dealer to speak to a qualified G
EPARTMENT
technician.
P
RODUCTS
3. In the USA: If you experience problems with this unit, please visit
://
.
.
/
.
or call 1 (732) 738-9003 for G
HTTP
WWW
GEMINIDJ
COM
SUPPORT
HTML
C
S
. Do not attempt to return this equipment to your deal-
USTOMER
ERVICE
er.
4. Be sure to allow adequate front & rear ventilation to avoid possible heat
damage to your equipment.
5. Be sure that the power is O
before making connections. This will elim-
FF
inate any chance of unexpected, loud audio transients that could damage
your speakers or amplifier.
6. Be sure that the power is O
when changing modes of operation &
FF
when changing the position of the Ground Lift Switch.
7. D
N
E
T
U
T
R
O
M
O
OT
XPOSE
HIS
NIT
O
AIN
R
OISTURE
ic equipment should in no way be in contact with water.
N
8.
EVER DEFEAT THE GROUND PIN OR POLARIZED BLADES
prong power plug. Defeating this safety feature poses a risk of electrocu-
tion. If your outlets do not comply to these standards, contact an electri-
cian.
9. D
N
U
A
S
C
O
L
O
OT
SE
NY
PRAY
LEANER
R
UBRICANT
S
.
WITCHES
CONNECTIONS:
1. Before plugging this unit into any outlet, make sure that the
V
S
OLTAGE
ELECTOR
selection, unscrew the hard plastic protective top with a Phillips head
screw driver. Then use a flat head screw driver to move the switch to the
.
P
A
ERIES
OWER
MPLIFIER
proper selection (115 V/230 V).
2. Ensure that the P
making any connections. This unit comes with a P
Plug into the rear panel AC I
into a proper power source.
NOTE:
PROTECT AGAINST ELECTRICAL SURGES
DISCONNECT THE
DRIVER INTO THE GROOVE LOCATED INSIDE THE AC IN WITH FUSE
&
DISLODGE THE FUSE
3. The GPA series has 2 sets of inputs:
- The XLR B
With standard three prong XLR connections, prong 1 is the
ground, prong 2 is hot or positive (+) & prong 3 is cold or
negative (-).
- The ¼" TRS B
as an unbalanced line level signal. The unbalanced line uses a
standard tip-sleeve connection. The tip is positive & the sleeve is negative
or ground. The balanced line uses a tip-ring-sleeve connection. (TRS) The tip is hot
or positive (+), the ring is cold or negative (-), & the sleeve is shield or
ground.
4. The GPA series has 2 sets of outputs.
- The 2 S
S
EMINI
ERVICE
amplifier.
S
EMINI
OUND
- The B
speakers to the amplifier only in M
mode allows the entire power of the amplifier to be used with one
EMINI
mono channel. This mode of output is meant only for 8 ohms or
greater impedance.
- The ¼" S
amplifier.
NOTE: M
AKE SURE THE
MAKING ANY CONNECTIONS
OPERATIONS:
1. O
PERATION
used to set the unit for S
M
. Operators of electron-
ONO
lower than 4 Ohms per channel for S
Ohm for M
B
ONO
RIDGE
found on the 3-
NOTE:
THE AMPLIFIER
ING MODES OF OPERATION
- S
O
TEREO
PERATION
channel provides a separate & discrete signal at the speaker outputs
O
A
C
O
N
NY
ONTROLS
R
according to the signal received at the inputs. The following instructions
are for applications with 4 Ohm to 8 Ohm speakers of matched power rat-
ings.
(1) switch is set to the proper voltage. To change the
(11) is in the O
position prior to
B
OWER
UTTON
FF
OWER
(3) jack before plugging it
F
N WITH
USE
(3)
250 V
LOCATED BY THE AC IN WITH FUSE
IS A
.
TO REPLACE THE FUSE
(2),
P
C
OWER
ORD
AND PLACE A FLAT HEAD SCREW
.
250 V
REPLACE THE FUSE WITH ONLY A
I
(10) accept a line level signal.
ALANCED
NPUTS
I
(9) accept a balanced as well
ALANCED
NPUTS
O
(4) connect speakers to the
PEAKON
UTPUTS
(5) connects the
O
S
RIDGE
UTPUT
PEAKON
B
O
. This
ONO
RIDGED
PERATION
O
(6) connect speakers to the
PEAKER
UTPUTS
(11)
P
B
OWER
UTTON
IS IN THE OFF POSITION BEFORE
.
: The O
M
S
M
S
ODE
WITCH
PERATION
ODE
WITCH
mode, P
M
TEREO
ARALLEL
ONO
mode. Total speaker impedance must not be
B
RIDGE
& P
M
modes, & 8
TEREO
ARALLEL
ONO
mode.
'
P
B
(11)
S
OWER
UTTON
MUST BE TURNED OFF WHEN CHANG
.
: The unit has two channels for S
operation. Each
TEREO
<4>
With the power O
, set the O
FF
position.
With the power O
, connect your input cables to the CH 1 & CH 2 inputs
FF
using the XLR B
I
ALANCED
NPUTS
each channel.
C
(2).
Connect the loudspeakers to either the CH 1 & CH 2 S
ORD
(6).
¼"S
O
PEAKER
UTPUTS
NOTE:
THE TOTAL SPEAKER LOAD MUST BE AT LEAST
FUSE TO
TRY TO OPERATE AT A LOWER IMPEDANCE
,
&
FIRST
MODE
CEASE OPERATING UNTIL YOU CORRECT THE LOAD CONDITIONS
-
With the CH 1 (13) & CH 2 (14) volume rotary controls set to zero (fully
(3)
counterclockwise), push the P
OWER
.
FUSE
Apply a signal to the input of the amplifier. The level of the input signal
should be as high as you will ever need it to be. This way, it will be as high
above the amplifier's noise floor as possible, ensuring an excellent per-
formance & signal to noise ratio. Adjust the CH 1 (13) & CH 2 (14) volume
rotary controls for each channel to achieve the desired maximum listening
level, or the maximum output level of the speaker systems, whichever comes first.
NOTE:
WHEN THE CLIP LEDS LIGHT
'
.
FIER
S OUTPUT SECTION
IF A CLIP LED LOCATED AT THE TOP OF THE VU METER
REMAINS ON OR FLASHES REPEATEDLY
INPUT LEVEL CONTROL FOR THE CHANNEL THAT IS CLIPPING OR REDUCE THE LEVEL
.
AT THE SOURCE
- P
M
O
: When the amplifier is in P
ARALLEL
ONO
PERATION
mode, the same monophonic signal is output on both output channels of
the S
O
(4) & ¼" S
PEAKON
UTPUTS
is controlled independently by the respective CH 1 (13) & CH 2 (14) vol-
ume rotary controls.
With the power O
, set the O
FF
position.
M
ONO
With the power O
, connect your input cable to the CH 1 input only
FF
using the XLR B
(10) or ¼" TRS B
I
ALANCED
NPUT
nel 1.
Connect the loudspeakers to both S
(6).
NOTE:
THE TOTAL SPEAKER LOAD MUST BE AT LEAST
TRY TO OPERATE AT A LOWER IMPEDANCE
&
(8) is
MODE
STOP OPERATION UNTIL YOU CORRECT THE LOAD CONDITIONS
With the CH 1 (13) & CH 2 (14) volume rotary controls set to zero (fully
mode or
counterclockwise), push the P
OWER
Apply a signal to the input. The level of the input signal should be as high
as you will ever need it to be. This way, it will be as high above the ampli-
fier's noise floor as possible, ensuring an excellent performance & signal to
-
noise ratio. Adjust the CH 1 (13) & CH 2 (14) volume rotary controls to
achieve the desired maximum listening level.
NOTE:
WHEN THE CLIP LEDS LIGHT
'
.
FIER
S OUTPUT SECTION
IF A CLIP LED REMAINS ON OR FLASHES REPEATEDLY
REDUCE THE SIGNAL LEVEL BY LOWERING THE INPUT LEVEL CONTROL FOR THE CHAN
NEL THAT IS CLIPPING OR REDUCE THE LEVEL AT THE SOURCE
- M
B
O
: Bridging the amplifier converts the unit to a
ONO
RIDGE
PERATION
M
S
(8) to the S
PERATION
ODE
WITCH
TEREO
(10) or ¼" TRS B
I
(9) of
ALANCED
NPUTS
(4) or
PEAKON
4 O
.
HMS PER CHANNEL
IF YOU
,
THE AMPLIFIER WILL GO INTO PROTECTION
.
(11) to turn O
the amplifier.
B
UTTON
N
,
-
THERE IS DISTORTION PRESENT IN THE AMPLI
(15)
,
REDUCE THE SIGNAL LEVEL BY LOWERING THE
M
ARALLEL
ONO
O
(6). Each channel's output
PEAKER
UTPUTS
M
S
(8) to the P
PERATION
ODE
WITCH
ARALLEL
(9) of chan-
I
ALANCED
NPUT
O
(4) or ¼" O
PEAKON
UTPUTS
UTPUTS
4 O
.
HMS PER CHANNEL
IF YOU
,
THE AMPLIFIER WILL GO INTO PROTECTION
.
B
(11) to turn O
the amplifier.
UTTON
N
,
-
THERE IS DISTORTION PRESENT IN THE AMPLI
,
-
.
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