Yamaha HTR-5660, LFE thump

margomaps · 6th March 2005, 05:41 PM

This is my first post here -- I hope I've chosen the right forum for this question. If not, I apologize, and I'm sure I'll soon be directed to the proper forum. That said...

I have a Yamaha HTR-5660 AVR in my home theater. I'd been very happy with it until recently. One day, apparently without provocation, it began to cause my subwoofer and tactile transducers (anything connected to the LFE/subwoofer-out) to make a nasty "thump" under certain circumstances. Those circumstances seem to coincide with the starting/stopping of an audio stream with information on the LFE channel. For example, changing cable channels causes the thump, because the AVR briefly loses and re-acquires the digital stream each time the channel is changed. The thump is very loud, and besides the annoyance, I'm worried whatever phenomenon is occuring may damage my subwoofer and transducers.

I'm not well versed in electronics, but it has been suggested to me that a capacitor in the AVR might have failed. For you electronics experts, does this sound like a plausible explanation for the thump? Do you think it would be fairly easy to identify the faulty capacitor and replace it? I'd really like to repair my Yahama rather than buy a new one. And if possible, I'd really like to repair it myself rather than paying someone else to do it.

I did a search, and I realize that various "thumps" are common. But the problems I read about pertained to turn-off and turn-on thumps only. My problem occurs while the AVR is on. And it's not a design issue, since it used to work fine. Clearly something broke.

Thanks for your help!

margomaps · 8th March 2005, 03:59 AM

After doing a lot more searching, I finally found a (temporary and ultimately unsatisfying) workaround. I suspected there was something wrong with the Subwoofer pre-out circuitry, so routed the LFE through the MAIN speakers instead. I hooked my subwoofer and transducers up via the L/R pre-outs, and that worked. No more popping, thumping sounds. Unfortunately my main speakers (Paradigm Monitor 7's) aren't really equipped to handle LFE, so as I said, it's not a great solution.

I'd still welcome any other suggestions on how to fix the problem, or what exactly might be going wrong.

6th March 2005, 05:41 PM	#1
margomaps diyAudio Member Join Date: Mar 2005 Location: Maryland	Yamaha HTR-5660, LFE thump This is my first post here -- I hope I've chosen the right forum for this question. If not, I apologize, and I'm sure I'll soon be directed to the proper forum. That said... I have a Yamaha HTR-5660 AVR in my home theater. I'd been very happy with it until recently. One day, apparently without provocation, it began to cause my subwoofer and tactile transducers (anything connected to the LFE/subwoofer-out) to make a nasty "thump" under certain circumstances. Those circumstances seem to coincide with the starting/stopping of an audio stream with information on the LFE channel. For example, changing cable channels causes the thump, because the AVR briefly loses and re-acquires the digital stream each time the channel is changed. The thump is very loud, and besides the annoyance, I'm worried whatever phenomenon is occuring may damage my subwoofer and transducers. I'm not well versed in electronics, but it has been suggested to me that a capacitor in the AVR might have failed. For you electronics experts, does this sound like a plausible explanation for the thump? Do you think it would be fairly easy to identify the faulty capacitor and replace it? I'd really like to repair my Yahama rather than buy a new one. And if possible, I'd really like to repair it myself rather than paying someone else to do it. I did a search, and I realize that various "thumps" are common. But the problems I read about pertained to turn-off and turn-on thumps only. My problem occurs while the AVR is on. And it's not a design issue, since it used to work fine. Clearly something broke. Thanks for your help!

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8th March 2005, 03:59 AM	#2
margomaps diyAudio Member Join Date: Mar 2005 Location: Maryland	After doing a lot more searching, I finally found a (temporary and ultimately unsatisfying) workaround. I suspected there was something wrong with the Subwoofer pre-out circuitry, so routed the LFE through the MAIN speakers instead. I hooked my subwoofer and transducers up via the L/R pre-outs, and that worked. No more popping, thumping sounds. Unfortunately my main speakers (Paradigm Monitor 7's) aren't really equipped to handle LFE, so as I said, it's not a great solution. I'd still welcome any other suggestions on how to fix the problem, or what exactly might be going wrong.

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