Woofer damage from new Star Wars THX DVD?


Both woofers in my JM Lab Utopias blew with the THX intro (exploding sphere) on the new Star Wars DVD. Happened at normal listening level through my Theta Casablanca II/VTL 7.5 preamp/Halcro dm58 amps. I've not blown a driver in over 30 years of being an audiophile. I've heard that the base was boosted as much as 36db on some of these DVDs. Even though the speakers are under warranty, I'm out $1,200 for a new Focal woofer (JM Lab only covers 1 driver for this kind of damage). Anybody with information or suggestions? Needless to say, I'm not happy about eating this expense if the fault really lies with an overmodulated DVD with no warning about increased bass levels. At the verey least, I'm curious to see if this happened to anyone else. The sound level was high enough that the concern for hearing loss came to mind (I'm a physician and I don't think I'm this concern is frivolous). Thanks for any thoughts or other input.
Ag insider logo xs@2xavimar

Showing 1 response by hifiho

Hmmm....
A 36 dB increase from what level? There's gotta be a reference point somewhere, right? And the frequency(ies) of attenuation might be better info to provide also.

But quick advice would be to check the disc vs. another. I'm sure SOMEBODY else besides you bought it. Distortion, rather than dB level might also be the problem. Whether produced by source, software, or amplifier (gain stages, yep!), the distortion is much harder for the amplifier to control than a clean over-emphasized recording.

Threatening the speaker manufacturer with negative newsgroup postings might get you some sympathy. Or maybe organizing a petition if enough people have actually had damage occur, you could contact the disc manufacturer. Keep accurate records either way. I'm curious.
As with most software, I would assume that the manufacturer only warantees the product, NOT the aftermath. Or connected components.

Back to the 36 dB issue.... WHERE did you hear this?

And lastly, if the SPL was enough for you to consider hearing damage..... Maybe you have a class action lawsuit on your hands. George Lucas probably has some mighty deep pockets. Of course, he might counter-sue because your Utopias aren't THX-Ultra II rated. Nor was the amp or the cables.