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21. POWER CORD: Connect the male
end of this cord to a properly grounded
AC power outlet. Use only a grounded
outlet! DO NOT defeat the ground pin
of the cord! If the amplifier is used out-
side of the United States, see the area’s
Crate dealer for the proper power cord
or consult a local professional electrician.
22. PREAMP OUT: A pre-amplified
line-level signal may be tapped from this
jack for sending to an external amplifier,
powered monitor, recording console,
mixing board or effects processor. This is
an unbalanced, mono 1/4” jack.
23. POWER AMP IN: A pre-amplified
line level signal may be sent directly into
the bass amp’s power amp (as when
slaving two amplifiers together, for exam-
ple). Connection to this jack interrupts
the signal from the internal preamp to
the power amp. The Preamp Out (#22)
signal is not interrupted.
24. SPEAKERS: Use these jacks to con-
nect the amp to your speaker cabinet(s).
Use heavy-duty speaker cables with
mono 1/4” plugs. These jacks are wired
in parallel. Don’t use cabinet combina-
tions resulting in impedance loads below
4 ohms. Use the chart below to help
determine parallel loads. If in doubt, ask
your dealer.
Cab Imp.
# Cabs T
otal Imp.
8 ohms 2 4 ohms
16 ohms 2 8 ohms
16 ohms 4 4 ohms
25. BALANCED LINE OUT: Use this
3-pin XLR jack to send a line level signal
to the house sound board or mixing con-
sole. The level of the signal at this jack is
determined by the setting of the Line
Out Level control on the front panel
(#10). This signal is switchable to be
either pre or post EQ through the front
panel Pre/Post switch(#11).
26. EFFECTS LOOP SEND: This
unbalanced jack lets you send a signal
out to an external effects processor or
tuner. The signal at this jack is post-EQ,
pre-Master. Connect this to the input
jack of the processor or tuner.
27. EFFECTS LOOP RETURN: This
jack receives the signal from the output
jack of an external effects processor. Use
shielded cables with mono 1/4” plugs for
connecting the Effects Loop.
MODEL:
SERIAL:
LINE: V ~ Hz
WATTS: MAX
BX-2215
BX2215PHD0312
120 60
550
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
ST. LOUIS, MO 63133
PREAMP
OUT
EFFECTS
LOOP
BALANCED
LINE OUT
PWR AMP
IN
RETURN
SEND
S
P
E
A
K
E
R
S
150W @ 8 OHMS
220W @ 4 OHMS
MIN. LOAD
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING:
TO REDUCE THE
RISK OF ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
AVIS:
RISQUE DE CHOC
ELECTRIQUE. NE PAS OUVRIR.
The Rear Panel:
55
21 22 23
24 25
26
27
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier