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Ampeg Bass Combo B4R User Manual

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    							11
Troubleshooting
In the unlikely event that your B4R should malfunction, take a few minutes to troubleshoot it before you call for ser-
vice. You can save yourself time and money by doing it yourself, and often the problem is something quite simple.
If the problem isn’t covered above, or if the steps lead you here, then contact your Ampeg dealer for service informa-
tion. Also, you should refer your amp to an authorized service center if it gets dropped, has liquid spilled into it, or sustains
damage to its power cord (see page 2).
System Block Diagram
NO SOUND
LEDs LIGHT
POOR SOUND
Check bass, cables
Check speaker(s)
Replace speaker(s)
POOR SOUND
LEDs DONT LIGHT
Check AC outlet
NO SOUND
NO HUMHUM
Listen for hum
NO CHANGE
SOUND OK
SOUND OK
POOR SOUNDSOUND OK
SOUND OK
Check amp controls, check
for signal from bass
Check power cord,
fuse, power switchCheck house fusebox
or circuit breakerSPEAKER(S) OK,
POOR SOUNDSPEAKER(S)
DEFECTIVE
Check speaker Unplug bass,
touch tip of cable
Speaker OK
Replace cable
NO CHANGE
SEE BELOWSEE BELOW
NO POWEROUTLET OK
OK
LIMIT
DEFEAT
SPEAKON®JACK
(MONO
BRIDGE/
BIAMP)  1+
2+ 1–
2–
SPEAKON®JACK
(A)
SPEAKON
®JACK
(B)
BINDING
POSTS
(B)
RED
(+)
BLK
(–)
Speakon® is a registered trademark of Neutrik AG.
BINDING
POSTS
(A)
RED
(+)
BLK
(–)
1+
2+ 1–
2–
2+2–
1+
1–
0dB
INPUT
-15dB
INPUT
MUTE
TUNER
OUT
GAIN
MASTER
EFFECTS
MIX
STYLE
BASSULTRA MIDTREBLE
TEXTURE
TONE CIRCUITS
PEAK
LED
UNBAL
LINE OUT
BAL
LINE
OUT PRE
LINE
OUT
PRE/
POST POST
HIGH
OUT
POWER
AMP IN
(A/MONO)
PREAMP
OUT
(A/MONO)
LOW
OUTPOWER
AMP A
STEREO
BRIDGE MONO
STEREO/
BRIDGED STEREO
BRIDGE
MONO
FREQ
LEVEL
BAL
POWER
AMP IN
(B)
PREAMP
OUT
(B) POWER
AMP B
LIMIT
LED
LIMITER
LIMITER
9 BAND
GRAPHIC
EQ
LEVEL
(SLIDERS)
f
(X9)
EQ IN
EFFECTS
RETURN
EFFECTS
SEND
FULL RANGEBIAMP
BI-AMP
DOMESTIC
EXPORT
SPKR
OUT
(A)
SPKR
OUT
(A)
SPKR
OUT
(B)
SPKR
OUT
(B)
GROUND
LIFT
B4R Bass Amplifier
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    							P/N 47-618-03  .
07/99 Ampeg reserves the right to change specifications without notice.
Ampeg is proudly Made in America. ©1999 SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
Technical Specifications
OUTPUT POWER RATING1350 Watts Mono-Bridged @ 4 Ohms (1000 Watts Continuous)
840 Watts Mono-Bridged @ 8 Ohms (680 Watts Continuous)
2 x 675 Watts @ 2 Ohms (500 Watts Continuous)
2 x 420 Watts @ 4 Ohms (340 Watts Continuous)
2 x 255 Watts @ 8 Ohms (205 Watts Continuous)
TONE CONTROL RANGE
Bass:±12dB @ 50Hz
Ultra Mid:+7dB @ 800Hz, -7dB @400Hz
Treble:±18dB @ 5kHz 
GRAPHIC EQ LEVEL±6dB
GRAPHIC EQ RANGE
33Hz:±15dB 
80Hz:±10dB
150Hz:±8dB
300Hz:±8dB
600Hz:±8dB
900Hz:±8dB
2kHz:±8dB
5kHz:±10dB
8kHz:±12dB
SIGNAL TO NOISE RATIO75dB typical 
FOOTSWITCH JACKGraphic EQ On/Off, Mute On/Off – Tip = Mute, Ring = EQ  
POWER REQUIREMENTS
Domestic:120VAC, 60Hz, 800VA
Export:100/115VAC 50/60Hz, 800VA
230VAC, 50/60Hz, 800VA
SIZE AND WEIGHT19/17.4”W x 5.6”H (with feet) x 15.5”D; 43 lbs
www.ampeg.com
B4R Bass Amplifier
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