Ampeg V4BH - Manual (Page 5)

5
The Rear Panel
V4BH Bass Amplifier
14 18 17 16 19 20 22 21 15
14. FUSE: This protects the unit from
damage due to overload conditions or
power line surges. If the fuse blows,
replace it only with the same size and
type.
15. AC LINE IN: Firmly insert the sup-
plied AC power cord into this socket
until it is fully seated. Plug the male
end of the cord into a grounded AC
outlet. DO NOT DEFEAT THE
GROUND PRONG OF THE AC
PLUG!
16. PREAMP OUT: This jack carries
the post-Master (10) signal. Using this
jack does not break the path to the
power amp. This signal can be used to
feed an external power amplifier, mix-
ing console or house PA system.
17. POWER AMP IN: This jack
accepts a signal to be sent to the
power amp and the Slave Out jack
(18). Using this jack breaks the path
from the signal that was present at the
Preamp Out jack (16). This can be
used as a post-Master (10) patch
point.
18. SLAVE OUT: This jack receives
the same signal that is being sent to
the power amp. It is useful for power-
ing another amp (slave) from this unit’s
preamp. It can also be used as an
“unbalanced” version of the Balanced
Out (19) signal.
19. BALANCED OUT: This XLR jack is
the preamp output. Thus, it will include
any processing done in the Preamp
Out/Power Amp loop (16,17). This sig-
nal can be used to feed an external
power amplifier, mixing console or
house PA system.
20. PRESENCE SWITCH: When this
switch is depressed a high fequency
boost is added to the output signal.
This helps compensate for a speaker
cabinet with no high frequency driver,
adding a glassy top end to the sound.
21. SPEAKER OUT: Two 1/4” phone
jacks are provided for connecting
speakers to the unit. These jacks are
wired in parallel. Use the jack on the
right (“Main”) first. The jack on the left
should only be used to connect a sec-
ond speaker cabinet.
NOTE: In some areas 1/4” speaker jacks are
not acceptable for use on amplifiers with
high output power levels. For this reason the
1/4” jacks on your amplifier may be sealed. If
this is the case, use the Speakon
® jack to
connect the amplifier to your speaker cabi-
net. Use a heavy duty speaker cable termi-
nated with the proper connectors.
22. IMPEDANCE SELECTOR: Use
this switch to match the output imped-
ance of the amp to the speaker(s)
being used (4 or 8 ohms). For help in
deciding the total impedance of your
system, consult the chart below.
Cabinet Number of Total
Impedance Cabinets Impedance
4 ohms 1 4 ohms
8 ohms 1 8 ohms
8 ohms 2 4 ohms
16 ohms 2 8 ohms
16 ohms 4 4 ohms
Speakon ® is a registered trademark of
Neutrik U.S.A.