AudioCircle
Other Stuff => Archived Circles => General Archive => Topic started by: john1970 on 28 Aug 2010, 02:13 am
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Dear Everyone,
I recently purchased a multichannel amp to use with my HT system. The amp is a solid state class D design. Today I installed it into my system and I noticed that when I turn off the map I get a loud (audible from 15 ft. away) pop from one of the speakers. When I turn off the amp all other equipment is turned off. Also, if I disconnect other speakers from the amp and move the speaker from one channel to the next that 3 channles make a loud popping sound and 2 are dead silent..
The manufacturer has a 30-day money back guarantee less 15%. Frankly, I am very much considering using it.
PLEASE OFFER ADVICE!
Best,
John
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Absolutely you should be concerned. Popping could be many things but usually indicates a breakdown in a solid state device or a cap shorting out when discharging. Possible DC going right to your speaker coils - can open the windings. Definitely not a good thing :o
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Absolutely you should be concerned. Popping could be many things but usually indicates a breakdown in a solid state device or a cap shorting out when discharging. Possible DC going right to your speaker coils - can open the windings. Definitely not a good thing :o
Thank you for the advice. I will be contacting the manufacturer first thing Monday morning and make arrangements for a full refund. Products sounds defective to me.
Best,
John
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If it was a soft thump I wouldn't worry about it but a pop from 15' is a bit much. And since the other channels don't exhibit that issue it sounds like a defective component of some sort. Yes, go for the warranty and in the meantime unplug it and box it up.
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If it was a soft thump I wouldn't worry about it but a pop from 15' is a bit much. And since the other channels don't exhibit that issue it sounds like a defective component of some sort. Yes, go for the warranty and in the meantime unplug it and box it up.
I agree. I am use to a soft thump or a slight hiss, but this is a loud popping sound on 3 of 5 channels!
Thanks,
John
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i turn my amp off first and on last. it seems to help for me. howard
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Turn on sequence;
You should always turn on your source first, then the preamp, then the amplifier
Turn off sequence;
Always turn off the amplifier first, then the preamp, then the source.
If your not doing it in that order , YOU NEED TO :thumb:
Kindest Regards,
Bill
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Turn on sequence;
You should always turn on your source first, then the preamp, then the amplifier
Turn off sequence;
Always turn off the amplifier first, then the preamp, then the source.
If your not doing it in that order , YOU NEED TO :thumb:
Kindest Regards,
Bill
Big +1 ..... :thumb:
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john1970,
Check on the boards if there are any multi-turn trimmers for adjusting DC offset. I have a some class D boards where one needs to adjust the trimmers for 0V DC offset. Measure the speaker outputs with a multi-meter.
IF this still persists, consider using a speaker protector that offers a 10 second start up delay, as well as instant turn off when you turn the power off. That way you never have to cringe everytime you power on/off. Nothing like destroying a $650 Accuton ceramic cone into a million pieces of china due to a transient.
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Dear Everyone,
Thank you for the advice. Because the unit has 30-day money back garauntee and I am sure that opening the unit violates the warranty I am going to return the unit. Seriously, the amp is brand new out of the box. You would think that a manufacturer would have check for this issue prior to shipping. I have spoken with another amp manufacturer and they stated that the amp could very well be passing DC and damaging my speaker's voice coils.
Best,
John
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Turn on sequence;
You should always turn on your source first, then the preamp, then the amplifier
Turn off sequence;
Always turn off the amplifier first, then the preamp, then the source.
If your not doing it in that order , YOU NEED TO :thumb:
Kindest Regards,
Bill
EXCELLENT ADVICE...! :thumb: