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Matching subwoofer output to mid-range speakers
The DPX1851 and DPX11551 feature a polarity control switch for reversing the
polarity of the output signal. This can be useful when matching the acoustic output
of your subwoofers to the output of your mid-range speakers.
Connecting directly to a head unit
The amps provide connections directly to a head unit without a pre-amp output,
such as a factory-installed head unit.
WARNING!
When using the speaker (high-level) inputs, the black wire
must be grounded at the radio. Failure to do so will result
in noise and/or improper operation.
Care and maintenance
Cleaning the case
Use a soft, dry cloth to gently wipe dust and dirt from the unit.
Do not use benzene, thinner, car cleaner, or other cleaners. These substances may
damage the unit or cause the paint to peel.
Servicing the unit
In the event that trouble arises, never open the case or disassemble the unit. The
internal parts are not serviceable by the user. Opening any components will void the
warranty.
CAUTION
Changes or modifications to this product not approved by the
manufacturer will void the warranty and will violate FCC approval.
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