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I've had a bad streak lately. About 4 months ago, I switched to a Dual 505 turntable with a XV-15 Pickering stylus due to problems with my other Project-1 deck. I have a B&K 2140 amp, B&K PT-3 pre-amp, and Creek OBH-8SE phone pre. My speakers were a Signets SLIIs. Well, the Signets had been played pretty hard and when I switched to the Dual a tweeter blew out right away.I wanted to upgrade my speakers anyway, so I bought a pair of B&W 603 S2. They sound great! I was (am) happy with them. When I bought the B&Ws, I asked the dealer if I had to worry about the B&K amp blowing them. He assured me that the B&Ws would not and that it was a great a fit for the amp.
Last night I was playing a record at mid to high volume and out cuts the woofer on the left channel (same channel as the Signet). At the time, I did notice a strange smell, much like electricity, whch could have been something inside the speaker frying. The speaker itself has no visible damage on the outside, but the only sound I have is out of the tweeter.
So now I am wondering if the Dual turntable is the culprit. Is it at all possible that a turntable could spike the signal causing a speaker to blow? Maybe the B&K? I am not an engineer or audiophile so it's hard for me to troubleshoot, but I don't want this to happen again.
Fortuantely the speakers are still under warrenty but I'm bummed to be without a decent system for awhile.
Follow Ups:
Im willing to bet on itOf course DC will not take out a tweeter because of the series
cap but I would suspect that amp channel and look into it further
Hey Stuart,If his amp is indeed putting out DC on the left channel, that would be easy enough to measure with a DVM and the OP said he didn't have an issues when playing CD's or DVD's and the blown woofer(s) only happened when playing vinyl so that would most likely rule out the possiblity of the amp no?
Cheers,
Ah...I did not read fully or I was not paying attentionI did not know the issue was only when he played Vinyl
If this is the case he has turntable rumble issues and needs
to roll off the low end /aka filtrationHowever, this does not explain the tweeter failure on the same channel other then high output levels/distortion/heating up the voice coil
to the point of failure or just age of the tweeter and useTurntable rumble is not an issue on a series cap to a driver
Scott has most likely nailed it.Sounds like U have a bad case of a tonearm/cartridge mismatch and/or a bad case of rumble on your TT. Either of these will produce very low frequency oscillations and when U play a warped record and see the woofers pumping like mad, U are dumping @#$%loads of current into your speakers and the B&K 2140 will certainly deliver it without protest!!
Also, playing a warped record at mid to high volumes with the woofers being taxed to their max as is most likely the case, then I am not surprised that U blew another woofer.
After U get your speaker fixed, look into eliminating the rumble/mismatch problem on your TT before cranking your favorite record again :-)
Cheers,
~kenster
Tonearm resonance could be the culprit. Play an LP at moderate volume on the good speaker. Does the woofer move in and out like mad? If so the table needs to be better isolated or get a low pass filter. I'm appreciative that vintage gear often has this feature. The problem never happened while playing a CD right?
That right. Now problems with CDs or DVD-A's. Also, the Dual has a grounding problem. If I leave the B&K pre-amp on the phono stage and a record is not playing, it starts to buzz like mad. I have to move the Creek phono-pre or move the tone arm to make it stop.
That was supposed to read NO problems with CDs, etc.
No blown speaker! It was just a wire that came loose and needed to be re-soldered. Phew! Thanks for the input from everybody.
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