Originally Posted by peechus
Don, I'm real tired replacing tweeters my 3.7i to the point of installing an after market planar tweeter. Do you know of any attempts, trials or dreams of accomplishments. By the way, the fuse never goes.
Hmmm... It has been a long time since I was a tech working on these, and never on a 3.7 though I don;t think the ribbon tweeter has changed much over the years. The only times I've dealt with repeated damaged tweeters it has either been simply too much power (too loud), somebody vacuuming them, and in one case I can recall (long ago) there was a crossover problem from the factory so the tweeter received too much low-frequency energy. (The latter I saw more often from people who decided to modify the crossover and did not pay attention to component values and changed it themselves.) I have found the fuse, again in the primordial past, would rarely save the ribbon, alas.
Has your dealer or Magnepan offered any advice or suggestions? Repeatedly blowing tweeters in a short time period is not usual IME.
- Make sure the AVR or whatever is not boosting the treble. Or that you have not inadvertently turned it up yourself (I did that myself to compensate hearing roll-off, stupid, good way to blow tweeters).
- Use the included tweeter resistors if you are not already to cut their output a bit (add after any room correction, natch -- some boost the treble and do not give you the option to reduce).
- You may be able to do a frequency sweep and look for the crossover points -- I have found that almost impossible to do in a room even with the mic close, however. Put the mic right at the tweeter (maybe and inch in front) and see where its response picks up). The goal is to see if the crossover is buggered for some reason.
When I was a tech (approximately the time we switched from stone to rubber for tires
) there weren't any viable aftermarket replacements. Infinity had their new EMIT and there were a (very) few other variations but they were no more reliable, and in many cases less so, than Magnepan's ribbon.
Sorry to hear of your problems, that is... vexing, to say the least. - Don