Tweeters usually blow due to overheating. Woofers usually blow because they are driven past their excursion limits, which is easy to do in the very low frequencies. So, like some others, I think turntable/record rumble is likely the cause for woofer damage.. A better tonearm/cartridge combination might help the cartridge ride the record warps better, but a rumble filter would reduce the excursion as well.

You say your receiver does have a Low filter, which many receivers of that vintage had.

You mention you often use the Loudness feature, but at louder volumes you don't but just turn up the bass. Well, either provides a low frequency boost and that will continue down into the record warp range below 15 Hz or so. So you use the low filter but then you turn around and boost the bass--kind of work against each other!

Even though I have a big subwoofer, I use an old product called Warp Knots, which fit in the RCA phono inputs to reduce the level of record warps even to the subwoofer. I do not think they are available. I think this product works very similarly, but still, it won't help much if you keep turning up the bass.

http://store.acousticsounds.com/d/60...le_Accessories


Well, as I recall, the KG4 doesn't go all that low in the bass anyway, so if you like the sound, I do suggest a subwoofer. A subwoofer will have a high pass filter to reduce the level of bass frequencies going to the main speakers, and any good subwoofer will outperform most speakers in the deep bass, anyway.