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You need another sound system. If it's xp it is probably ac 97. However; go to windows update, make sure you have all of the updates. Then go to the control panel, device manager and look for a yellow question mark or a yellow exclamation mark, if there, right click and click update driver or click uninstall from the system, restart the computer and windows will look for the drivers, just follow on screen directions.
Check to be sure there are no speaker wires touching ground, and that the wires are connected in phase to the head unit.
5 1/4" Doors
Left Front (+)
Left Front (-)
Right Front (+)
Right Front (-)
6" x 9" Rear Deck
Left Rear (+)
Left Rear (-)
Right Rear (+)
Right Rear (-)
The symptoms you are relaying definately sound like an internal amplifier problem. It is fading in and out for a reason - usually due to heat.
Have you had the radio bench tested (seperate from the car) to eliminate the car as being the culprit?
Since the radio was run with damaged speakers originally, the output or amplifier power supply on the amplifier may be bad.
As an alternative to repairing, I would suggest investing in a small 2 channel amplifier to power the speakers.
The radios claim 50W per channel, but in reality give 12-15W RMS power.
A dedicated amplifier with built in crossovers and gain adjustments will prolong the life of your speakers and add to the tonal qualities of your new speakers. Instead of turning up the volume on the head Unit, and sending out a distorted signal that will blow your speakers, an amplifier will give more CLEAN power to them, so it will be louder at a lower volume setting.
This will bypass the internal amplifier on the radio, and send a Low Level signal ONLY thru a set of RCA cables.
go to standby hold m-log button tell menu comes on display press up on volume control tell amplifier comes on display pess left on volume control tell display says amp on. the built in amp on the stereo turns of and on to provide better sound quality to the pre-amp out puts
If the standby/protection indicator on the amplifier blinks when you specifically press the volume +/- key, it obviously indicates that the unit is receiving the remote's command. Try the following while pressing the volume key on the remote: 1.- Put your ear as close as possible to the volume control knob and listen for the sound of a motor spinning, if you hear it, the volume control assembly needs repair. If you hear no sound, proceed to next step. 2.- Gently rotate the volume control knob on the amplifier unit (it might be stuck and needs a "little help").
If none of the above applies, the unit needs to be opened and troubleshooted. I've seen many instances where the volume control motor was not properly connected to the board or the assembly was put back incorrectly (specially in units that have been opened to be refurbished). I've heard NAD has a limited warranty for refurbished items. It might be wise for you to check before sending the unit for repair at your expense or trying to tackle the problem yourself. Hope this helps.