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<blockquote data-quote="Rhino3207" data-source="post: 8906829" data-attributes="member: 693971">Hello,I recently bought a 1996 firebird with audio issues. Whenever the head unit is turned on there is a high pitched &quot;mosquito noise&quot; coming from all of the speakers. The sound is there if the engine is on or off. The audio will still play through the noise but it&#039;s fairly loud.There was an aftermarket Sony head unit in the car already but it didn&#039;t have Bluetooth so I swapped it to see if that would fix the issue. I installed a Sony dsx-a415bt. Unfortunately the problem still persisted.I dug into it and found that it has had every speaker replaced by a previous owner. I looks like they wired the whole system in with speaker wire. Everything is hooked up to a kenwood xr 900-5 amp. Good power and ground on the amp and I cleaned up the ground.I have only ever replaced head units in vehicles before so I&#039;m a little out of my depths here. Is there something else I should be checking for? Is the amp done for? If the amp is done for is there somewhere I can get it repaired instead of replacing it? Any help is appreciated, thanks.</blockquote>

[QUOTE="Rhino3207, post: 8906829, member: 693971"] Hello, I recently bought a 1996 firebird with audio issues. Whenever the head unit is turned on there is a high pitched "mosquito noise" coming from all of the speakers. The sound is there if the engine is on or off. The audio will still play through the noise but it's fairly loud. There was an aftermarket Sony head unit in the car already but it didn't have Bluetooth so I swapped it to see if that would fix the issue. I installed a Sony dsx-a415bt. Unfortunately the problem still persisted. I dug into it and found that it has had every speaker replaced by a previous owner. I looks like they wired the whole system in with speaker wire. Everything is hooked up to a kenwood xr 900-5 amp. Good power and ground on the amp and I cleaned up the ground. I have only ever replaced head units in vehicles before so I'm a little out of my depths here. Is there something else I should be checking for? Is the amp done for? If the amp is done for is there somewhere I can get it repaired instead of replacing it? Any help is appreciated, thanks. [/QUOTE]

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