Help, please! Expy Mach Audio Died
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Joined: Dec 2004
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Help, please! Expy Mach Audio Died
Any help you may offer is much appreciated - I am stumped.
I have a 97 Expedition with a Mach Audio system that has stopped working. The head unit has power and is functioning normally. No sound from any of the speakers. I have tried both the aftermarket head unit that was installed when the system failed, as well as the stock tape deck unit that I dusted off an put back in. Both have power, show the level moving up and down with the volume level, just no sound at the speakers. I plugged the aftermarket unit into some other equipment and was able to verify that everything seems to be working just fine - even used it to power the subwoofer speaker directly to verify that the sub was working.
I have read many posts on this site referencing the right rear interior trim panel as the location of the amplifier - in front of the sub-woofer. Indeed it is there and is receiving power to the connector plug. Apart from not functioning, it doesn't seem to heat or even warm up under power as I understand amplifiers should do. No noticable burn marks or other indication of damage to the interior circuit board of the amp.
I am assuming that this burned out amp is at least part of my problem. What I can't figure out is if there is another amplifier somewhere else that powers the door speakers. This one seems awfully small to run four speakers and a sub.
Can someone verify for me that this is the only amplifier installed on the vehicle?
Are there any procedures that I could follow to verify that the amplifier is shot?
What would you experts recommend as a replacement unit that will provide the same function as I had before? I don't need anything spectacular as I was perfectly happy with the stock sound quality.
How much should I expect to pay for an equivalent replacement unit?
Thanks for your help,
Pete
I have a 97 Expedition with a Mach Audio system that has stopped working. The head unit has power and is functioning normally. No sound from any of the speakers. I have tried both the aftermarket head unit that was installed when the system failed, as well as the stock tape deck unit that I dusted off an put back in. Both have power, show the level moving up and down with the volume level, just no sound at the speakers. I plugged the aftermarket unit into some other equipment and was able to verify that everything seems to be working just fine - even used it to power the subwoofer speaker directly to verify that the sub was working.
I have read many posts on this site referencing the right rear interior trim panel as the location of the amplifier - in front of the sub-woofer. Indeed it is there and is receiving power to the connector plug. Apart from not functioning, it doesn't seem to heat or even warm up under power as I understand amplifiers should do. No noticable burn marks or other indication of damage to the interior circuit board of the amp.
I am assuming that this burned out amp is at least part of my problem. What I can't figure out is if there is another amplifier somewhere else that powers the door speakers. This one seems awfully small to run four speakers and a sub.
Can someone verify for me that this is the only amplifier installed on the vehicle?
Are there any procedures that I could follow to verify that the amplifier is shot?
What would you experts recommend as a replacement unit that will provide the same function as I had before? I don't need anything spectacular as I was perfectly happy with the stock sound quality.
How much should I expect to pay for an equivalent replacement unit?
Thanks for your help,
Pete
Lead Driver
Joined: May 2004
Posts: 6,461
Likes: 6
From: Abilene Kansas
surly the amp doesnt power all the speakers... but it might... one way to see if the amp is dead is heat when its on, most amps will get really hot after a while when dead... from blown capacitors and what not
Matt
Matt
