I had been having a "crackle" sound coming from both my S38s, which as I use as my mains, so I emailed JBL to try and find out what the problem was. Here's what they said: I'm sorry to hear of the problem with your speakers. Usually when drivers (meaning woofers, midranges and tweeters) are damaged in pairs, this is the result of receiving a signal that they should not have received. There are two ways to blow speakers. The first is the one we all know and understand. If you pump 500 watts into a speaker that is only rated at a 100 watts, kaboom, it blows up. As a result, very few of us do this. So then why are all of these speakers blowing up? Because of the second reason, "under-powering". It's really a misleading term, but let's try to explain. First let's take it to the extreme. Example: You have a 1000 watt speaker and a 100 watt amplifier. The way you like to listen to music requires 300 watts. Typically, you will ask your amp to put out that 300 watts that you want to hear. The amp will do it, but it will "clip" and "distort". Unfortunately, the human ear can't hear distortion until it reaches almost 10%. By that time it's usually too late. The speaker keeps trying to reproduce this distortion that it's not capable or reproducing and eventually, it blows (usually the tweeter fails first). There is a very easy way to determine if you are asking too much of your amplifier. Follow these directions to perform this test. * Set the Bass and Treble knobs in the middle (flat). * Make sure all Equalization buttons are turned off (loudness, EQ, contour, etc.) * Put on a CD * Turn the volume half way up (electronic volume controls, display would read 0 dB). If you normally listen louder than this, chances are you are pushing your amp too far, causing it to clip, and blowing speakers. Generally speaking, when listening to CD, VCR, DVD, or Laser-disc, you are at maximum clean listening volume when you reach the half-way point on your volume control. The reason is very simply. These sources have a very "hot" output. In the old days when we were all using turntables, you would hit maximum volume at the 3/4 mark. This is because the output of a turntable is considerably lower than any of the new sources. The reason this standard has not changed is because of versatility. You may be trying to watch a home-recorded VHS or Cassette, and it may not have been recorded very loud. So you need the extra volume control to make up for the difference in a situation like that. Please keep in mind, if you normally listen with your bass and treble knobs boosted and/or the loudness button etc. pushed in, it is possible to push the amp too far with your volume knob as low as 1/3 volume. If you are pushing your receiver too hard, it is suggested that you realize your systems limitations or recommend that you get a more powerful amplifier. Please realize, if you only buy speakers that will handle more power and not a more powerful amplifier, you won't solve the problem. The speakers will still blow, because it is distortion that is blowing them, not too much power. If you are handy with a screwdriver, I can send you a pair of tweeters. Please email back with your shipping address and I will send them to you. If you would rather have an authorized service center take care of this for you, then please click on Product Support on the JBL Home website link of www.jbl.com . Enter in the model # and click Submit. Then click on Service Station Locator to find an authorized service center near you. The speakers have a five year warranty. Just show them a copy of your purchase receipt for warranty service. Now, I was amazed when all he asked for was my shipping address to send the new tweeters, and so I did give it to him and he is sending me new tweeters. My question is, how do I avoid this problem in teh future? I use a 100 watt per channel Yamaha receiver to power the speakers and I NEVER listen to anything above reference volume. So, what can I do to avoiding blowing the tweeters in the future? Would getting a voltage stabilizer or something like that help the problem?