Gemini PA-702 Page 3 Operation Manual Download

Page: 3 / 8

Page 3

INTRODUCTION

Congratulations on purchasing a

GEMINI

model

PA-702

rack mountable

preamplifier. This state of the art unit includes the latest features backed by a
three year warranty. Prior to use, we suggest that you carefully read all the
instructions.

CAUTIONS

1. All operating instructions should be read before using this equipment.

2. To reduce the risk of electrical shock, do not open the unit. There are NO

USER REPLACEABLE PARTS INSIDE. Please refer servicing to a qualified
service technician.

3. Do not expose this unit to direct sunlight or to a heat source such as a

radiator or stove.

4. This unit should be cleaned only with a damp cloth. Avoid solvents or other

cleaning detergents.

5. When moving this equipment, it should be placed in its original carton and

packaging. This will reduce the risk of damage during transit.

6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

7. DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANY CONTROLS

OR SWITCHES.

CONNECTION

1. Be sure the

POWER (1)

switch is in the OFF position. All connections must

be made with all equipment OFF.

2 . For best sound, use only high quality RCA cables when hooking up

equipment to the

PA-702

. Make sure that all cables are pushed in securely.

3. Connect the

OUTPUT LINE (22)

jacks of the

PA-702

to your amplifier(s).

4. Plug your microphone into the

MIC (5)

jack on the front panel of the

PA-702

5. Plug your headphone into the

PHONE (11)

jack on the front panel.

6. Plug your turntable into the

PHONO (16)

jacks and attach the ground wire

from the turntable to the

GND (23)

screw.

7. Plug your CD player into the

CD (17)

jacks.

8. Plug your tuner into the

TUNER (18)

jacks.

9. Any other line level output device (such as a mixer) may be connected to

the

AUX (19)

jacks.

10.You will require two sets of RCA cables to connect your tape deck to the

PA-702

. Use one set of RCA cables to connect the tape deck’s playback

or output jacks to the

PLAY (20)

jacks on the rear of the

PA-702

. Use the

other set of RCA cables to connect the tape deck’s record or input jacks to
the

REC (21)

jacks on the

PA-702

NOTE:

TE:

TE: Any line level device can be connected to the PLA

PLA

PLAY (20)

Y (20)

Y (20) jacks and

then can be accessed by the TAPE MONIT

MONIT

MONITOR (3)

OR (3)

OR (3) button.

OPERATION

POWER

Once you have made all source connections to the

PA-702

, and

you have made sure that the

VOLTAGE SELECTOR (24)

switch is in the

proper position, plug the power cord into a power source and press the

POWER (1)

button (LED lights).

INPUT SELECTION

The

INPUT SELECTION (2)

switch determines

which input source goes through the

PA-702

to the amplifier. If the PHONO

position is selected on the

INPUT SELECTION (2)

switch, then the source

connected to

PHONO (16)

jack on the back panel will be selected. If the CD

position is selected, then the source connected to the

CD (17)

jack on the

back will be selected.

TAPE MONITOR

Pressing the

TAPE MONITOR (3)

button (the LED is lit)

allows you to hear the playback signal of your tape deck or whatever you
have connected to the

PLAY (20)

jacks on the rear panel. Pressing the

TAPE MONITOR (3)

button a second time (the LED is off), disengages the

tape monitor circuit.

MIC LEVEL

The

MIC LEVEL (4)

control adjusts the volume of the

microphone.

MIC JACK

1/4" microphone input jack

(5)

VOLUME

Overall volume is controlled by the

VOLUME (6)

control.

BALANCE

Use this control to adjust the relative levels of the left and right

channels. The 12 o’clock position is the point of equal

BALANCE (7)

TREBLE

The

TREBLE (8

) control adjusts the relative level of the high

frequencies in the sound.

MID

The

MID (9)

control adjusts the relative level of the mid range

frequencies in the sound.

10.

BASS

The

BASS (10)

control adjusts the relative level of the low

frequencies in the sound.

11.

PHONE JACK

1/4" headphone input jack

(11)

12.

MONO

When the

MONO (12)

button is activated (LED is lit), the two

stereo channels are blended together to produce monophonic sound. This
blend minimizes rumble and surface noise in old monophonic records.
Push the button a second time (LED goes out) to get back to stereo mode.

13.

MUTE

Pushing this button reduces the volume of the amplifier output

signal by approximately 20 dB. Pressing the button a second time removes
the muting. The

MUTE (13)

has no effect on the microphone volume.

14.

LOW CUT

The output from a turntable usually contains strong but

inaudible impulses at infrasonic frequencies (below 20Hz) due to disc
warps, stylus/tonearm resonance, and vibrations that reach the turntable.
If these are amplified at full strength, they may waste amplifier power and
muddy the sound. The

LOW CUT FILTER (14)

attenuates these unwanted

signals.

15.

LOUDNESS

When pressed, the

LOUDNESS (15)

button engages a

“loudness compensation” circuit which, at low-to-medium volume, boosts
the bass and treble response.

USING THE GROUND LIFT SWITCH

Depending on your system configuration, sometimes applying the ground will
create a quieter signal path. Sometimes lifting the ground can eliminate ground
loops and hum to create a quieter signal path.

1. With the unit on, listen to the system in idle mode (no signal present) with

the ground applied (the

GROUND LIFT

SWITCH (25)

in the left position).

Then turn the power off before moving the GROUND LIFT SWITCH
(25)

. Lift the ground by moving the

GROUND LIFT SWITCH

to the right,

turn the power back on and listen to determine which position will provide
a signal devoid of background noise and hum. Keep the

GROUND LIFT

SWITCH

in the ground position if the noise level remains the same in either

position.

CAUTION: Do not terminate the AC ground on the unit in any way. Termination

of the AC ground can be hazardous.

SPECIFICATIONS

INPUTS SENSITIVITY/IMPEDANCE
Mic..................................................................................................1mV / 3 Kohms
Phono.........................................................................................3mV / 47 Kohms
Tape,Tuner,CD, Aux......................................................................150mV / 22 Kohms

OUTPUT/IMPEDANCE
Tape Rec.....................................................................................150mV / 3 Kohms
Pre Output..................................................................................max. 11V / 1 Kohms

TOTAL HARMONIC DISTORTION
Mic................................................................................................less than 0.02%
Phono...........................................................................................less than 0.04%
Tape,Tuner,CD, Aux................................................................less than 0.01%

SIGNAL TO NOISE RATIO
Mic.........................................................................................more than 70dB
Phono....................................................................................more than 90dB
Tape,Tuner,CD, Aux............................................................more than 100dB

GENERAL
Frequency Response..................................................5Hz - 30 KHz +0, - 3dB
Bass..........................................................................................+/-12dB at 100Hz
Midrange..........................................................................................+/-9dB at 1KHz
Treble..................................................................................+/-12dB at 10KHz
Loudness.........................................................................+9/0/+9dB at 100/1K/10KHz
Mute........................................................................................................-20dB
Power.........................................................................120V or 230V, 50/60Hz
Power Consumption....................................................................................15W
Dimensions...................................................................483mm x 45mm x 248 mm

19" x 1.75" x 9.75"

Weight................................................................................................4 kg (9 lbs.)