MTX RFL4120, Owner'S Manual

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Installation & Mounting :
6. Connect a Remote Turn-on wire from the head unit to the MTX amplifier’s Remote terminal. If the head unit does not have a dedi-
cated Remote Turn-on lead, you may connect to the head unit’s Power Antenna lead.
7. Connect RCA cables from the head unit to the MTX amplifier’s RCA inputs. Run all signal cables away from vehicle wiring, computers
and power cables. If cables must be crossed do so at a 90° angle. Use only high quality RCA cables to decrease radiated noise from
entering the system.
8. Connect your speakers to your MTX amplifier’s speaker terminals using the right gauge speaker wire. Two channels bridged can drive
a 4 ohm minimum load for max power.
9. Double check all previous installation steps, in particular, wiring and component connections. Once verified, reconnect the vehicle’s
negative battery cable, turn the circuit breaker on or place the fuse in the fuse holder.
Note
: Gain Levels on the amplifier should be turned all the way down (counter clockwise) before proceeding with adjustments.
Troubleshooting :
Problem Cause Solution
No LED indication No +12V at remote connection 12V to terminal
No +12V at Power connection 12V to terminal
Insufficient ground connection Verify ground connection
Blown power fuse Replace fuse
Power LED on, no output Volume on head unit off Increase volume on head unit
Speaker connections not made Make speaker connections
Gain control on amplifier off Turn up gain
Signal processing units off Apply power to signal processor
All speakers blown Replace speakers
Output distorted Head unit volume set too high Lower head unit volume
Amplifier gain set too high Lower amplifier gain
Balance reversed Speakers wired reversed Wire speakers with correct
orientation
RCA inputs reversed Reverse RCA input
Bass is weak Speakers wired out of phase Wire speakers with correct phase
Not using MTX woofers Buy MTX woofers
Blowing fuses Excessive output levels Lower the volume
Amplifier defective Return for service
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