Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
I celebrated too soon. After only 6 hours of use the squeaky tone is back. Less than before but still noticeable.
Im probably gonna swap the unit for another 2. hand sub, but the repair was worth a shot....
Jumme
Member
Last Activity: 08-02-2022, 12:33 PM
Joined: 05-04-2015
Location: Copenhagen
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Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
Thanks for your kind reply. There wasn't enough space around the transformer to get a straw in, so I choose another route:
I took some red varnish made specifically for coloring light bulbs, and gave the transformer a thick coating. After letting it drip and harden 24 hours, I also covered the transformer and the whole area in hot glue.
(SO FAR) the high pitched squeaking is completely gone and I am VERY happy!
Though it was probably not the correct coating...Leave a comment:
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Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
You mean, completely under the transformer? Between component and board?...Leave a comment:
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Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
That depends on if you have something specific in mind??
I live in Denmark. Nothin is cheap here, not even in the cheap shops..
I think you're right, and that's exactly what Im hoping to do.
I'm not gonna spend a minute more than necessary, not knowing what Im doing. Im lucky if the unit survives this repair attempt....Leave a comment:
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Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
I understand.
The culprit is the coil wrapped in yellow paper or tape.
This is to already reduce noise, correct? Its also covered in some guey but hard compound, I think that's called conformal coating. Even so its making an audible squeaky whine.
Im pretty sure this is 230V in, and also the board that relays the sub in standby mode after a few minutes with no input. I have a suspicion whine is getting higher under load/after some time/warm, and worst when the unit...Leave a comment:
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Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
Thanks, that makes good sense!
Q: I read somewhere a long time ago that noise could be due to design fault; not being induced from the noisy component itself but rather somewhere else in the circuit. Thus tampering whit the component would not help, but changing eg a diode somewhere else would. Whats your opinion on this?
Is that explanation only related to speaker humm (which my problem is definitely not)?...Leave a comment:
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Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
Thanks a lot, much appreciated. 'Prod any coils', how exactly?
Sorry, English is not my first language....Leave a comment:
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Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!
So. Had my Boston Acoustics subwoofer for 4 years and it had a terrible coil whine squeal from day one.
I RMA'd it twice, but both times it came back (after a 6-8 weeks return time) and had the exact same problem.
Said they "swapped the amplifier module". As it didnt help, personally I feel more convinced its the PSU module. Company now bankrupt and I cant stand the noise:
Its a high pitch coil whine tone -it's terrible agonizing, when worst, I hear it clearly 4-5 m from the Sub (because sits in corner).
It wines without RCA input.... -
Re: Sony STR-DB940 pulled back from the brink
Sorry for hijacking this thread.
I resoldered the relay joints, but actually my current problem lies somewhere else with this receiver.
I have a ground type humming from the SUB channel, using the SUB PRE OUT (the only sub out rca on this model). Its very notable, even if volume is turned completely down on the receiver.
Beside this problem, everything is working perfect. 2 channel / 5.1 sound playing, and so on.
Also, if I use the "selector" button on the front, theres loud "echo...Leave a comment:
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Sony STR-DB940 hum/bleed in, in SUB channel only
Hello, been struggling with this receiver.
It did some relay clicking some months ago (back channel lost for seconds), but clicking stopped. After that working fine.
I purchased new speakers (Boston Acoustics), and for the first time used the SUB PRE OUT for an active sub. Worked fine. For one week.
In the middle of a tv program suddenly came loud, audible hum from the sub woofer. As the sub was new, I thought I had a faulty unit.
But after some troubleshooting, I narrowed the problem down to the old receiver. Please correct me if Im wrong, from the following... -
Re: New Members - please post your introductions here
Greetings everyone,
Im a preschool teachers coach, who once did technocal collage and still mess up hardware.
I found this cool forum through Google, trying to fix a older Sony 5.1 receiver with a minor defective.
Nice meeting you all. : )
Nb please beware english is not my primary language.Leave a comment:
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