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BASSFACE DB4.4 Instruction Manual page 3

Class a/b 4/3/2 channel bridgeable stereo 12v power amplifier 840w verified rms power output

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not recommend mounting an amplifier on a bass box as the vibrations can cause damage
to the internals of the amplifier over time.
You need to ensure that the load you subject your amplifier to is within specification and of
a sensible nature and that you have the appropriate cooling where applicable. It is your
responsibility to ensure the amp is kept at a sensible working temperature. Vertical
mounting or "hot boxing" can cause severe damage to the amplifier. Also take care
mounting an amp onto a board that has been covered in carpet. This can restrict airflow
under the amplifier, limiting the amount of convection cooling that can be achieved and
insulating the amplifier underneath which can build up heat inside the amp. For
installations that are space compromised the installer can add small PC style fans to
circulate air.
When choosing a speaker impedance remember that bridging a pair of output halves the
impedance – So a 4 ohm woofer bridged the amp sees 2 ohms per side. Thus to run a 2
ohm load on a bridged amplifier it must be capable of seeing only 1 ohm per side.
Also please remember that it is bad practice to run only "half" of a 4 channel amplifier and
leave the other "half" not connected to anything. This can cause the amplifier to fail on the
undriven channels over time. If you want to run only 2 speakers from a 4 channel amplifier
always bridge the outputs so that there is load on all four.
Time to lay on some power. Connect the earth first, then 12V power, then remote. Then

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