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Old 04-11-2020, 06:22 PM   #1
Coupe93cb7SE
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93 SE Speaker whine

I bought my CB7 last year, I noticed the speakers in the rear had a high pitched whine coming from them. I just unplugged them and didnít think about it till I was ready to replace the speakers. Which I did today, the speakers both old and new have this high pitched sound coming from them. The car is a 93 SE with the nose system, however when I got the car it had a after market head unit and after market rear speakers. I replace the stereo with something newer and decided I would replace the rear speakers also. This did not fix the whine noise coming from the rear speakers. Iíve read it could possible be the Bose system still causing this some how. Does anyone have or had this issue? Please help!
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Old 04-11-2020, 07:17 PM   #2
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Do you know if the Bose system was bypassed or removed? I wouldn't expect most aftermarket units to be compatible with the Bose amplifier. In a coupe, the amp is located in the right quarter panel behind the rear seat side panel. On an SE coupe I rescued, the Bose system was toast, so I removed the amp and jumped all the wires so that I could use an OEM EX or LX radio.
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Old 04-11-2020, 08:36 PM   #3
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I am not sure if anything with the Bose system has been messed with, if I had to guess itís all still installed. The head unit works just fine, and the front stock 4Ē..... speakers work just fine. The rear replacement speakers make the high pitch noise though. Is there a forum for bypassing or complete Bose removal of the amp?
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Old 04-11-2020, 09:14 PM   #4
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I'd start by pulling the radio and looking at what was done to connect to the car harness. Then pull the right quarter inside panel (in the passenger compartment) and see what was done with the Bose amp.
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Old 04-11-2020, 09:25 PM   #5
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I just rewired the connector into my new kenwood adaptor. It was only spliced from the original from what I can tell. Iíll have to look for the Bose amp in the morning Iíll let you know what I find.
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Old 04-11-2020, 11:13 PM   #6
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Whine is always a speaker wire running over a power wire or too close. If it's only the rear, follow them both up to the front. Somewhere along the way they lay on top of some form of power wire. The same can happen if the unit is not properly grounded but that's usually all the speakers doing it.
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Old 04-12-2020, 10:45 AM   #7
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Quote:
Originally Posted by Raf99 View Post
Whine is always a speaker wire running over a power wire or too close. If it's only the rear, follow them both up to the front. Somewhere along the way they lay on top of some form of power wire. The same can happen if the unit is not properly grounded but that's usually all the speakers doing it.
How would I know where or what is a power wire? Does anyone have a diagram?
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Old 04-12-2020, 03:38 PM   #8
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Assuming you are using the OEM speaker wires this issue is going to be up by the passengers feet area. Either the back of the stereo or in that area. Have an amp too?
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Old 04-12-2020, 05:09 PM   #9
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So I plugged the rears in again today, the high pitch is intermittent. However, when I put the balance of the system to the rear the speakers were very weak, and if in attempted to turn them up it became distorted. I took apart the back and found the amp, now I need to figure out how to bypass it.. any ideas? I would like to be able to add new speakers to the front also but I feel anything after market it going to have the same issue as the rear. Also does anyone know how to make the front fit 6.5Ē I have like 4Ē in there now.
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Old 04-12-2020, 06:04 PM   #10
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Ahh. Ok .

Step 1. Find a friend who knows stereos
Step 2. Have them come and look at your setup

....
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Old 04-14-2020, 08:28 PM   #11
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Haha I like it. Itíll most likely be a shop unfortunately donít know many stereo guys. Thanks for the help everyone!
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Old 04-14-2020, 09:26 PM   #12
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haha, cool man. Best of luck. I said what i said as this could be a real easy fix but you may spend too much time on this.
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Old 04-14-2020, 10:25 PM   #13
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If you can find an OEM service manual, it will have a wiring diagram for the Bose system. As originally configured, all the speakers are driven by the amp. To convert to 6.5 inch speakers in the front, you can get the speaker "baskets" from an LX to replace the SE speaker pods.
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