USER'S MANUAL
www.pyramidcaraudio.com
PB-1838GX PB-738GX
PB-238GX
PB-638GX
PB-1038GX
congratulations...
on your purchase of a Pyramid Royal Blue Series
amplifier. This amplifier extends the Pyramid
tradition into a totally new series of amps, designed
from the ground up to deliver the power,
performance and flexibility the modern car audio
enthusiast demands.
When you check the list of features offered by the
PB-238GX, PB-638GX, PB-738GX, PB-1038GX, PB-
1838GX, you’ll know you made the right choice
with a Pyramid Power amplifier.
1
mono input connections
PB-738GX/PB-1838GX
13
stereo input connections
PB-738GX/PB-1838GX
12
speaker connections
PB-238GX/PB-638GX/PB-1038GX
table of contents
mounting and installation
23
protection circuitry and troubleshooting
24
16-17
18
20
21-22
19
speaker connections
PB-738GX/PB-1838GX
high level mono input connections
PB-638GX/PB-1038GX
mono input connections
PB-638GX/PB-1038GX
high level input connections
PB-638GX/PB-1038GX
electrical connections
PB-238GX
PB-638GX/PB-738GX
PB-1038GX/PB-1838GX
10-11
2/4 channel input connections
PB-238GX
14-15
features and specifications
PB-238GX
4-5
PB-738GX
PB-1838GX
6-7
general features
2-3
precautions
25
PB-638GX/PB-1038GX
8-9
· 400 Watts x 4 Output
· 800W x 2 Bridged Output (400W x 2 + 800W x 1)
· Dual Variable Hi/Lo Electronic Crossover Network
· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· Remote Bass Boost
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
· Tri-Mode Configurable
PB
-638G
X
High Performance 1600 Watt 4 Channel
Bridgeable MOSFET Amplifier
· 500 Watts x 2 Output
· 1000W x 1 Bridged Output
· Variable Hi/Lo Electronic Crossover Network
· Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· Remote Bass Boost
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
PB
-738G
X
High Performance 1000 Watt 2 Channel
Bridgeable MOSFET Amplifier
2
· 100 Watts x 4 Output
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· S/N Ratio: > 95 dB
· THD: <0.04%
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
PB
-238G
X
High Performance
4
00 Watt
4
Channel Amplifier
general features
3
· 1500 Watts x 2 Output
· 3000W x 1 Bridged Output
· Variable Hi/Lo Electronic Crossover Network
· Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· Remote Bass Boost
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
PB-1836GX
High Performance 3000 Watt 2 Channel
Bridgeable MOSFET Amplifier
general features
· 1000 Watts x 4 Output
· 2000 Watts x 2 Bridged Output(1000Wx2+2000Wx1)
· Dual Variable Hi/Lo Electronic Crossover Network
· Dual Variable Bass Boost (0 - +18 dB @ 60Hz)
· Variable Input Level (Gain) Control
· Remote Turn On/Off
· Gold Plated RCA Inputs
· High Level MOLEX Inputs
· Power ON LED Indicator
· LED Protection Indicator
· Remote Bass Boost
· S/N Ratio: > 95 dB
· THD: <0.04%
· Thermal Protection
· Overload Protection
· Short Circuit Protection
· Anti-Thump Turn-On
· Tri-Mode Configurable
PB
-
1038G
X
High Performance
4
0
00 Watt
4
Channel
Bridgeable MOSFET Amplifier
4
features and controls
speaker connections
power terminals
power fuse
4 ch amp PB-238GX
high level inputs
input level control
low level inputs
high level inputs
input level control
low level inputs
power LED
POWER
LOW IN
HI IN
CH2 CH1
+ - - +
MIN MAX
LEVEL
CH 2
CH 1
LOW IN
CH 4
CH 3
MIN MAX
LEVEL
HI IN
CH4 CH3
+ - - +
4 CHANNEL POWER AMPLIFIER
+
--
+
-
+
-
+
CH3
CH4
GROUND
+12V BATT
REM
FUSE
CH1
CH2
5
input level control
low level inputs
high level inputs
power LED
power fuse
power terminals
speaker connections
use this control to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level control until distortion begins to occur, and reduce slightly
from this point.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
30 Watts x 4
100 Watts x 4
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
matching speaker impedance
stereo mode
bridged mode
10A
274 x 61 x 235
10.8 x 2.4 x 9.25
features and specifications
4 ch amp PB-238GX
6
Remote Bass Boost
crossover mode selector
protection LED
low pass frequency control
bass boost level
power LED
high pass frequency control
high level inputs
input level control
low level inputs
speaker connections
power terminals
power fuse
features and controls
2 ch amp PB-738GX • PB-1238GX
LEVEL
REMOTE
BASS BOOST
POWERPROTECT
+18db
0
BASS
BOOST
35
400
Hz
LPF
HPF
80 2.5k
Hz
FREQ.
FULL
HPF
LPF
L
R
HI IN
R L
+ - - +
LOW IN
MIN MAX
2 CHANNEL MOSFET AMPLIFIER
GROUND
FUSE
BRIDGED
-
+
-
+
-
+
L
R
+12V BATT
REM
PB
-738GX
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
75 Watts x 2
125 Watts x 2
500 Watts x 2
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
150 Watts x 2
250 Watts x 2
1500 Watts x 2
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
matching speaker impedance
stereo mode
bridged mode
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
20 A 40 A
274 x 61x 305
10.8 x 2.4 x 12
274 x 61 x 432
10.8 x 2.4 x 12
when used with normal, full range systems, set these switches to “FULL.”
If you wish to use the internal crossovers to power a driver of specific
frequency range, use the “LOWPASS” or “HIGHPASS” settings.
use these controls to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level controls until distortion begins to occur, and reduce slightly
from this point.
when one or both of the crossover selector switches is in “low pass”
mode, one can set the upper frequency limit for audio program sent to
the speakers.
when the one or both of crossover selector switch is in “high pass” mode,
one can set the lower frequency limit for audio program sent to the
speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB in either or both pairs of channels.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
7
PB
-1838GX
crossover mode selectors
input level controls
low pass frequency controls
high pass frequency controls
bass boost level controls
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
features and specifications
2 ch amp PB-738GX • PB-1838GX
8
speaker connections
power terminals
power fuse
protection LED
power LED
ch 3/4 low level inputs
ch 3/4 high level inputs
ch 1/2 low level inputs
ch 1/2 high level inputs
ch 3/4 bass boost level control
ch 3/4 low pass frequency control
ch 3/4 high pass frequency control
ch 3/4 crossover mode selector switch
ch 3/4 input level control
ch 1/2 input level control
ch 1/2 bass boost level control
ch 1/2 low pass frequency control
ch 1/2 high pass frequency control
ch 1/2 crossover mode selector switch
features and controls
4 ch amp PB-638GX • PB-1038GX
4 CHANNEL MOSFET AMPLIFIER
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
HPF
2.5k
BASS
BOOST
MIN MAX
FREQ.
POWERPROTECT
CH 1
CH 2
80
Hz
LPF
HI IN
CH4 CH3
+ - - +
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
CHANNEL 1/2CHANNEL 3/4
HI IN
CH2 CH1
+ - - +
+18db
0
2.5k
80
Hz
35
400
Hz
REMOTE
BASS BOOST(CH3/4)
BRIDGED
+
--
+
-
+
-
+
CH3
CH4
GROUND
+12V BATT
REM
BRIDGED
FUSE
-
+
-
+
CH1
CH2
9
PB
-638GX
frequency response
power supply voltage
output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms
RMS Power @ 2 Ohms
Maximum Power Output
input sensitivity
low level inputs
high level inputs
35 Watts x 4
65 Watts x 4
400 Watts x 4
15 Hz-30 KHz
250mV
2.5V
14.4V DC Neg. Ground (10.5-16V)
PB
-1038GX
75 Watts x 4
125 Watts x 4
1000 Watts x 4
maximum current draw
dimensions (W x H x L)
mm
inches
2-4 Ohms
4-8 Ohms
matching speaker impedance
stereo mode
bridged mode
input impedance
low level inputs
high level inputs
10K Ohms
100 Ohms
20 A 40 A
274 x 61 x 305
10.5 x 2.4 x 12
274 x 61 x 432
10.5 x 2.4 x 17
dual crossover mode selectors
dual input level controls
dual low pass frequency controls
dual high pass frequency controls
dual bass boost level controls
low level inputs
high level inputs
power LED
protection LED
power fuse
power terminals
speaker connections
when used with normal, full range systems, set these switches to “FULL.”
If you wish to use the internal crossovers to power a driver of specific
frequency range, use the “LOWPASS” or “HIGHPASS” settings.
use these controls to match the outputs of your head unit to the amplifier.
Starting with your head unit set at about the 2 o’clock position, increase
the amp level controls until distortion begins to occur, and reduce slightly
from this point.
when one or both of the crossover selector switches is in “low pass”
mode, one can set the upper frequency limit for audio program sent to
the speakers.
when the one or both of crossover selector switch is in “high pass” mode,
one can set the lower frequency limit for audio program sent to the
speakers.
this control permits adjustment of the bass level up to an increase of
approximately 18 dB in either or both pairs of channels.
this amp features gold-plated RCA input jacks for high impedance input.
Use these with car stereo output which uses RCA-type connector cables.
if your car stereo lacks RCA-type output jacks, you may connect speaker
output leads to these input connectors.
this indicator is illuminated when power is applied.
this indicator is illuminated when built-in protection circuitry is activated.
the fuse protects the amplifier and your car’s electrical system from short
circuit conditions.
use these connectors to deliver power, ground and remote turn-on control
to the amplifier.
these terminals are 14K gold plated to guarantee high conductivity and
minimum signal loss.
CH 3/4 Remote Bass Boost Plug in the Remote Bass Boost Control wire in here.
features and specifications
4 ch amp PB-638GX • PB-1038GX
10
to remote turn-on
+12V
head unit
12V battery
electrical connections
2 ch amp PB-738GX • PB-1838GX
GROUND
FUSE
BRIDGED
-
+
-
+
-
+
L
R
+12V BATT
REM
11
to remote turn-on
+12V
head unit
12V battery
to remote turn-on
+12V
head unit
12V battery
electrical connections
4 ch amp PB-238GX • PB-638GX • PB-1038GX
BRIDGED
+
--
+
-
+
-
+
CH3
CH4
GROUND
+12V BATT
REM
BRIDGED
FUSE
-
+
-
+
CH1
CH2
BRIDGED
+
--
+
-
+
-
+
CH3
CH4
GROUND
+12V BATT
REM
BRIDGED
FUSE
-
+
-
+
CH1
CH2
12
head unit
using low level inputs
PLEASE NOTE! If using high level
inputs, do not use the low level RCA
inputs at the same time!
using high level inputs
Y Adaptors
L/R Audio
Outputs
from speaker terminals
L L RR
head unit
stereo input connections
2 ch amp PB-738GX • PB-1838GX
LEVEL
REMOTE
BASS BOOST
POWERPROTECT
+18db
0
BASS
BOOST
35
400
Hz
LPF
HPF
80 2.5k
Hz
FREQ.
FULL
HPF
LPF
L
R
HI IN
R L
+ - - +
LOW IN
MIN MAX
2 CHANNEL MOSFET AMPLIFIER
LEVEL
REMOTE
BASS BOOST
POWERPROTECT
+18db
0
BASS
BOOST
35
400
Hz
LPF
HPF
80 2.5k
Hz
FREQ.
FULL
HPF
LPF
L
R
HI IN
R L
+ - - +
LOW IN
MIN MAX
2 CHANNEL MOSFET AMPLIFIER
head unit
using low level inputs
PLEASE NOTE! If using high level
inputs, do not use the low level RCA
inputs at the same time!
using high level inputs
To a second amplifier
Y Adaptors
head unit
wiring harnesswiring harness
To a second amplifier
RRLL
from speaker terminals
13
mono input connections
2 ch amp PB-738GX • PB-1838GX
LEVEL
REMOTE
BASS BOOST
POWERPROTECT
+18db
0
BASS
BOOST
35
400
Hz
LPF
HPF
80
2.5k
Hz
FREQ.
FULL
HPF
LPF
L
R
HI IN
R L
+ - - +
LOW IN
MIN MAX
2 CHANNEL MOSFET AMPLIFIER
LEVEL
REMOTE
BASS BOOST
POWERPROTECT
+18db
0
BASS
BOOST
35
400
Hz
LPF
HPF
80 2.5k
Hz
FREQ.
FULL
HPF
LPF
L
R
HI IN
R L
+ - - +
LOW IN
MIN MAX
2 CHANNEL MOSFET AMPLIFIER
4 CH input connections using low level inputs
2 CH input connections using low level inputs
Y adaptors
L
R
head unit
L/R REAR
Audio Outputs
L/R FRONT
Audio Outputs
14
2/4 channel input connections
4 ch amp PB-238GX
POWER
LOW IN
HI IN
CH2 CH1
+ - - +
MIN MAX
LEVEL
CH 2
CH 1
LOW IN
CH 4
CH 3
MIN MAX
LEVEL
HI IN
CH4 CH3
+ - - +
4 CHANNEL POWER AMPLIFIER
POWER
LOW IN
HI IN
CH2 CH1
+ - - +
MIN MAX
LEVEL
CH 2
CH 1
LOW IN
CH 4
CH 3
MIN MAX
LEVEL
HI IN
CH4 CH3
+ - - +
4 CHANNEL POWER AMPLIFIER
4 CH floating ground connections
from speaker terminals
L R FRONTL RREAR
ORANGE
ORANGE
ORANGE
ORANGE
BLACK
BLACK
BLACK
BLACK
PLEASE NOTE! If using high level inputs,
do not use the low level RCA inputs at
the same time!
CH 1/2
4 CH harness wiring for common ground connections
from speaker terminals
L R FRONTRLREAR
ORANGE
ORANGE
ORANGE
ORANGE
BLACK
BLACK
BLACK
BLACK
CH 3/4
15
high level
input connections
4 ch amp PB-238GX
POWER
LOW IN
HI IN
CH2 CH1
+ - - +
MIN MAX
LEVEL
CH 2
CH 1
LOW IN
CH 4
CH 3
MIN MAX
LEVEL
HI IN
CH4 CH3
+ - - +
4 CHANNEL POWER AMPLIFIER
4 CH Stereo input connections using low level inputs
2 CH Stereo input connections using low level inputs
Y adaptors
R
L
head unit
16
L/R REAR
Audio Outputs
L/R FRONT
Audio Outputs
Stereo
input connections
4 ch amp PB-638GX • PB-1038GX
4 CHANNEL MOSFET AMPLIFIER
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
HPF
2.5k
BASS
BOOST
MIN MAX
FREQ.
POWERPROTECT
CH 1
CH 2
80
Hz
LPF
HI IN
CH4 CH3
+ - - +
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
CHANNEL 1/2CHANNEL 3/4
HI IN
CH2 CH1
+ - - +
+18db
0
2.5k
80
Hz
35
400
Hz
REMOTE
BASS BOOST(CH3/4)
4 CHANNEL MOSFET AMPLIFIER
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
HPF
2.5k
BASS
BOOST
MIN MAX
FREQ.
POWERPROTECT
CH 1
CH 2
80
Hz
LPF
HI IN
CH4 CH3
+ - - +
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
CHANNEL 1/2CHANNEL 3/4
HI IN
CH2 CH1
+ - - +
+18db
0
2.5k
80
Hz
35
400
Hz
REMOTE
BASS BOOST(CH3/4)
4 CH floating ground connections
17
from speaker terminals
L R FRONTL RREAR
ORANGE
ORANGE
ORANGE
ORANGE
BLACK
BLACK
BLACK
BLACK
PLEASE NOTE! If using high level inputs,
do not use the low level RCA inputs at
the same time!
CH 1/2
4 CH harness wiring for common ground connections
from speaker terminals
L R FRONTRLREAR
ORANGE
ORANGE
ORANGE
ORANGE
BLACK
BLACK
BLACK
BLACK
CH 3/4
high level
Stereo
input connections
4 ch amp PB-638GX • PB-1038GX
4 CHANNEL MOSFET AMPLIFIER
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
HPF
2.5k
BASS
BOOST
MIN MAX
FREQ.
POWERPROTECT
CH 1
CH 2
80
Hz
LPF
HI IN
CH4 CH3
+ - - +
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
CHANNEL 1/2CHANNEL 3/4
HI IN
CH2 CH1
+ - - +
+18db
0
2.5k
80
Hz
35
400
Hz
REMOTE
BASS BOOST(CH3/4)
RIGHT FRONT Audio Outputs
LEFT FRONT Audio Outputs
4 CH mono input connections using low level inputs
2 CH mono input connections using low level inputs
Y adaptors
L
R
head unit
LEFT REAR Audio Outputs
RIGHT REAR Audio Outputs
18
mono
input connections
4 ch amp PB-638GX • PB-1038GX
4 CHANNEL MOSFET AMPLIFIER
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
HPF
2.5k
BASS
BOOST
MIN MAX
FREQ.
POWERPROTECT
CH 1
CH 2
80
Hz
LPF
HI IN
CH4 CH3
+ - - +
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
CHANNEL 1/2CHANNEL 3/4
HI IN
CH2 CH1
+ - - +
+18db
0
2.5k
80
Hz
35
400
Hz
REMOTE
BASS BOOST(CH3/4)
4 CHANNEL MOSFET AMPLIFIER
FREQ.
CH 3
LOW IN
LEVEL
MIN MAX
CH 4
HPF
+18db
0
35
400
Hz
LPF
HPF
2.5k
BASS
BOOST
MIN MAX
FREQ.
POWERPROTECT
CH 1
CH 2
80
Hz
LPF
HI IN
CH4 CH3
+ - - +
LOW IN
BASS
BOOST
LEVEL
FULL
HPF
LPF
FULL
HPF
LPF
CHANNEL 1/2CHANNEL 3/4
HI IN
CH2 CH1
+ - - +
+18db
0
2.5k
80
Hz
35
400
Hz
REMOTE
BASS BOOST(CH3/4)
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