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Using the Biamp Capabilities – BX-440H:
6
BX-440H / BX-4115
BX-440H / BX-4115 ThunderBass Amplifier
About Biamping: The Biamp High and Low outputs of the BX-440H and the BX-4115 allow for a number of ways
to “biamp” your system: that is, using two amplifier/speaker combinations to share the task of reproducing the full
range of your bass. Biamping increases each amplifier’s efficiency by allowing it to “focus” on a certain frequency
range, rather than operating full range. The results of biamping include cleaner sound and more output power than
that of a single-amped system, which is especially useful during high volume live performances.
There are a number of different ways to use the BX-440H and the BX-4115 in biamp configurations. The examples
on the following pages show several biamp possiblities – you may find others. Your Crate dealer can assist you in
assembling the custom biamp ThunderBass rig to best suit your playing style and venue.
The Biamp Controls: The front panel Crossover Frequency
control (#15) sets the point where the low frequency signal rolls
off and the high frequency signal begins. This control is variable
from 100Hz to 1kHz. Adjust this control to best suit the fre-
quency range of your low frequency speaker cabinet. The
Crossover Balance control (#16) proportions the signal between
the high and the low output jacks (#26 and 27, rear panel).
Adjust this control for the most appealling blend of lows and
highs.
Example 1:
With the BX-440H and a BXE-18
cabinet for the low end; a BX-
220H and a BXE-410H cabinet for
the high end:
Plug your bass into the BX-440H, then:
(1) Run a shielded cable from the
biamp high out jack of the BX-440H to
the power amp in jack of the BX-220H.
(2) Run a speaker cable from the
speaker out jack of the BX-220H to the
input jack of the BXE-410H.
(3) Run a shielded cable from the
biamp low out jack of the BX-440H to
its power amp in jack.
(4) Run a speaker cable from the
speaker out jack of the BX-440H to the
direct in jack of the BXE-18.
Adjust the Crossover Frequency and
Balance controls for the best sound.
FREQUENCY BALANCE
100 Hz 1kHz
300 Hz
LO HI
CROSSOVER
15 16
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
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.
MODEL
SERIAL #
1200W MAX / 120V / 60Hz
BX-440H
CAUTION: CHASSIS SURFACE HOT.
ATTENTION: SURFACIE DE CHASSIS CHAUDE.
AC LINE IN
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
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
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
BX-220H
BX-220H
BX-440H
BX-440H
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
ST. LOUIS, MO 63133
HIGH
OUT
47-146-04
SERIAL #
MODEL:
CRATE BXE-18
POWER HANDLING: 200 WATTS
IMPEDANCE: 8 OHMS
CROSSOVER FREQUENCY: 200Hz
DIRECT
IN
CROSSOVER
INPUTS
BXE-18
BXE-410H
direct
in
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
ST. LOUIS, MO 63133
HIGH
OUT
47-146-04
SERIAL #
MODEL:
CRATE BXE-18
POWER HANDLING: 200 WATTS
IMPEDANCE: 8 OHMS
CROSSOVER FREQUENCY: 200Hz
DIRECT
IN
CROSSOVER
INPUTS
input
from
bass
1
3
2
4
TO
BXE-410H
TO
BXE-18
1
3
2 4