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Further Information
For additional information, please visit our website at www.altomobile.com, which includes a technical discussion forum
where users can exchange ideas.
Troubleshooting
Power LED not lit: Is the Remote switch cable from the source unit (Cassette or CD Player) attached to the REM terminal
of the ADP amplifier, and is the source unit switched on? Are the +12V and GND (Ground) terminals connected correctly?
Is the Ground cable properly attached to the chassis of the vehicle or to an existing ground point that is known to be OK?
Check the fuse and replace if blown (use only a fuse of the correct rating).
No Sound: Adjust the level of the ADP amplifier Input Gain Control. Are the Input signal cables correctly connected? If
there is only sound from one channel, swap the Left and Right channel Input cables at the amplifier inputs. If the fault
moves to the other channel then the fault is with a cable, or the source unit or other unit between the source unit and
amplifier (active crossover, for example). If the fault remains in the same speaker, check the speaker cable is connected
correctly. If it seems correct, swap the Left and Right Output (speaker) cables on the ADP amplifier. If the fault remains
in the same speaker then the problem may be with that speaker or the speaker cable. If the fault moves to the other
speaker then the amplifier may be faulty. Leave the unit installed in your system and return to your dealer so that they
can check it.
Distorted Sound or Low Volume: Adjust the Input Gain Control of the amplifier and, where applicable, the Output Level
Controls of any unit before the amplifier (such as an active crossover or ALTO Mobile digital signal processor). Check the
settings of the amplifier's on-board filter.
Music cuts out intermittently at high level: The amplifier is protecting itself, either because it is being over-driven or be-
cause the speaker impedance load is dropping too low. Reduce the volume level or adjust the amplifier Gain towards
MIN. Ensure that the overall nominal impedance of the connected speaker system is no less than 4 ohms (stereo mode).