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 didn’t 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. I’ve 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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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.90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums -
I am not sure if anything with the Bose system has been messed with, if I had to guess it’s all still installed. The head unit works just fine, and the front stock 4”..... 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?Comment
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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.90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner ForumsComment
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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. I’ll have to look for the Bose amp in the morning I’ll let you know what I find.Comment
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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.Comment
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How would I know where or what is a power wire? Does anyone have a diagram?Originally posted by Raf99 View PostComment
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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?Comment
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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 6.5” I have like 4” in there now.Comment
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Ahh. Ok .
Step 1. Find a friend who knows stereos
Step 2. Have them come and look at your setup
....Comment
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Haha I like it. It’ll most likely be a shop unfortunately don’t know many stereo guys. Thanks for the help everyone!Comment
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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.Comment
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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.90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner ForumsComment
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agree with manual if you have one
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you can see what colors each speaker uses and try and locate those on the amp - hopefully they match up
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spend the time and pull you interior and rewire the speakers. also take time to check your ground for your stereo
id just rewire myself .. i know that its done properly and bypass all previous install / uninstalls
be a good time to run some rca's and a power wire tooComment
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I still have the OEM Bose system and have experienced alternator whine but only while I use the Bluetooth adapter that's plugged into an aux jack I had wired into the head unit. I tried a few things and the easiest fix seems to be a noise filter that I've plugged in between the aux jack and Bluetooth.
In your car since it's coming from the rear speakers my guess is the power amp in the trunk is failing. Or if you're lucky a bad ground exists either between the amp and/or head unit. Unfortunately the Bose amps are long gone now but if you want a referral for someone who specializes in repairing these systems I'd recommend Willmans Electronics.
Otherwise you might try a ground loop nose isolator or an Inline Power Noise Suppressor Filter... hope this helpsComment
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