Originally Posted by Brian Kinney
Hey guys, I am having an issue and wondering if anyone has any idea what is going on. I have two Parasound JC1's that are connected to a Bryston processor via XLR's. They are biwired to a pair of Kef Blade speakers. I am having an issue though some how the tweeters seemed to have gone dead on the speakers when the volume was turned to a moderate level. Now the tweeters do not seem to work at all. To see what was going on I connected a different pair of Kef R900's to the amps and at low volume the same thing happened to the speaker on the right, nothing came out of the tweeter. I connected those same speakers to a different reciever and the same problem occured. I am wondering if the JC1's could be somehow blowing the tweeters on the speakers? Is there a setting I have them on that could be doing this or could there be something wrong with the amps? Any input would be greatly appreciated, if I get the tweeters replaced I want to make sure this does not happen again.
Seems unlikely to have two amps fail at once, common to your problem scenario is the processor. If you ran some sort of room acoustic set up, there-in may lie the problem. I noticed once when I ran the audessey routine, it cranked the higher bands on my center channel eq to the max, re ran the routine and it went back to normal. If you can view your eq settings look there first.
It may also of been distortion that took out your tweaters. As powerful as the mono blocks are they can be pushed to clipping. At higher listening levels you have to listen carefully for distorted sound, once noticed you have to back off the listening levels. Dirty sound can be produced by driving components too hard and is also very dependant on the source material.
For every 3db you turn your volume up you require double the power to run clean sound. The wattage requirement snow balls very quickly. 400 watts is a lot of power, if the speakers aren't playing loud enough for you in your room you either need more power, or speakers with a higher sensitivity.
Hope this helps, good luck