Cloudsbelow Posted September 29, 2014 Share Posted September 29, 2014 I have a pair of Tannoy Mercury F4 customs and a Luxman lv-105 amp. I noticed that my tweeter was dead.. replaced it.. couple months later same problem. Figuring either the crossover is hopped in the speaker or my amp is damaging the speaker. Any ideas? Quote Link to comment Share on other sites More sharing options...
dangorange Posted September 29, 2014 Share Posted September 29, 2014 Do you have a multimeter to measure for DC offset from the amp? I had the same issue with one of my ProAc's. One tweeter was dead, replaced the voice coil and then that started having issues a few months later. Luckily for me, the original voice coil dying was just from old age, and the replacement had gotten debris in it which was causing distortion. I cleaned it out and it's been fine since. I think DC offset is usually more harmful to the woofers, but could still be something to look into. Quote Link to comment Share on other sites More sharing options...
Cloudsbelow Posted September 29, 2014 Author Share Posted September 29, 2014 I have a multimeter. Just got off the phone with the Tannoy guys and they're stumped.. couple ideas of what could be doing it. Gonna have to have the outputs scoped to make sure the signal is the same out of both channels. Probably not the crossover... so frustrating. Quote Link to comment Share on other sites More sharing options...
dangorange Posted September 30, 2014 Share Posted September 30, 2014 I hear you, I'm sure it's something easy to fix, but maybe tough to sort out, good luck. Quote Link to comment Share on other sites More sharing options...
allenh Posted September 30, 2014 Share Posted September 30, 2014 Has to be slightly high DC current coming from somewhere and I doubt it's a crossover problem as I would expect you would hear that before there was any driver damage so it's got the be your output stage on that side, getting the amplifier outputs checked will be the answer though. There should be test point in there for you to check the idle current and the bias etc. so see if you can turn up a service manual. As an thought I expect it's dumping just a little too much current on that side when you power off and it's taking out the weakest link which will be the tweeter. Quote Link to comment Share on other sites More sharing options...
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