4
5
6-channel full range stereo
AMPLIFIER APPLICATIONS
NAA 665 6-Channel Amplifier
AMPLIFIER FEATURE DESCRIPTION
POWER
PROTECT
INPUT
CH1
CH3
CH6
CH2
CH4
L
CH5
R
CH 5 & 6
LP HP FULL
X-OVER
LO-MED-HI
LEVEL
CH 3 & 4
LP HP FULL
X-OVER
LO-MED-HI
LEVEL
CH 1 & 2
LP HP FULL
X-OVER
LO-MED-HI
LEVEL
GND REM BATT +12V
+ ch1 - + ch2 - - ch5 +
+ ch3 - + ch4 - + ch5 -
BRIDGED
SPEAKER OUTPUT
POWER
BRIDGED
BRIDGED
X-OVER (CROSSOVER) SWITCHES
The X-Over switches allow you to control the fixed crossover slopes
for each group of paired channels (1 & 2 / 3 & 4 / 5 & 6)
- LP: Low Pass plays 100Hz / 24dB & below
- HP: High Pass plays 100Hz / 12dB & above
- FULL: Full Range plays all frequencies controlled by the Radio/CD
player
LEVEL CONTROL
The LEVEL control switches allow you to selectfixed unbalanced (RCA)
input sensitivities provided by your Radio / CD player
- LO: Low accepts unbalanced input from 0.2V to 2.5V
- MED: Medium accepts unbalanced input from 2.5V to 4V
- HI: High accepts unbalanced input from 4V to 6V
POWER / PROTECT INDICATORS
POWER: The Power light will illuminate blue to indicate that the amp
is “ON” and ready to play
PROTECT: The Protect light will illuminate red to indicate that the
amp diagnostic circuit has detected a fault and the amp will not play
until the problem is resolved. Here is a list of Faults that will cause
the amp to shut down and go into the PROTECT mode.
- THERMAL: The internal components reach a temperature above
their allowed safe operating temperature range.
- SHORT CIRCUIT: Pinched or shorted speaker lead, shorted speaker
voice coil or shorted passive crossover provided with the compo-
nent speakers.
- OVER-LOAD: Operating below proper operating impedances (4-
Ohms & 2-Ohms stereo and 4-Ohms mono bridged).
INPUTS
There are 3 sets (channel 1-2 / 3-4 / 5-6) of unbalanced (RCA) low
level inputs which will allow for complete control of front / rear fade
& left / right balance. Be sure to use high quality shielded RCA audio
cables for maximum signal transfer.
POWER
PROTECT
INPUT
CH1
CH3
CH6
CH2
CH4
L
CH5
R
CH 5 & 6
LP HP FULL
X-OVER
LO-MED-HI
LEVEL
CH 3 & 4
LP HP FULL
X-OVER
LO-MED-HI
LEVEL
CH 1 & 2
LP HP FULL
X-OVER
LO-MED-HI
LEVEL
FULL RANGE STEREO
LINE INPUTS FROM
RADIO / CD PLAYER
CROSSOVER SWITCHES IN
“FULL” (FULL RANGE)
GND REM BATT +12V
+ ch1 - + ch2 - - ch5 +
+ ch3 - + ch4 - + ch6 -
BRIDGED
SPEAKER OUTPUT
POWER
BRIDGED
BRIDGED
+
-
+
-
+
-
+
-
+
-
+
-
REMOTE TURN-ON
CHASSIS GROUND
B 12 VOLTS
FULL RANGE STEREO SPEAKERS
4-Ohms Or 2-Ohms
FULL RANGE STEREO SPEAKERS
4-OHM OR 2-OHM
40 Amp Fuse
4 gauge
4 gauge
18 gauge
En
gl
is
h
POWER / GROUND
This amplifier requires high quality 4 gauge power and ground ca-
bles.
REMOTE
The remote wire turns the amplifier on and off via the Radio/CD play-
er “remote output” wire.
SPEAKER OUTPUT
The molded speaker terminals accept 18 gauge to 12 gauge speaker
wires. We recommend 16 to 18 gauge high quality speaker wires for
full range speakers and 12 to 14 gauge
for subwoofer applications.
NOTE: To ensure maximum performance and sound quality, ple-
ase read and the installation and wiring directions on the follo-
wing pages carefully.
Note: The diagram illustrates using 3 sets of RCA cables for ma-
ximum front / rear fade and left / rear balance control.
If your Radio / CD player has only 2 sets (front / rear) RCA cables,
just plug them into channels 1-4 (all 6 channels will play)
and you will still have front / rear fade and left / rear balance.
If the radio has only 1 set of RCA cables, plug them into channels
1-2 and all 6 channels will still play. You will have left / right
balance but will not have front / rear fade.
CAUTION: This amp is capable of 4-Ohms and 2-Ohms wired in
the “stereo” mode & 4-Ohms when wired “mono bridged”. It is
not capable of 1-Ohm stereo or 2-Ohms mono bridged.
