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In Reply to: Re: Some new pictures at Lambda Acoustics - Unity - wonder how TD15 will work and what price? posted by Mark Seaton on April 04, 2001 at 19:03:56:
Hi Markcertainly this 94dB version would be a nice compromise for many people and I'll look forward to your posting the specs - do you think the the 94dB unit may be able to xover as high as 1.8Khz? (I know this is high but I like it with some pro woofers and compression horn)
once I tested a woofer @150 watts - within a couple of minutes the voice coil melted the poly cone - then silence - I'm impressed by such a small change in Re under such conditions and hope to see the short-throw model with accordian surround.
Your Unity project should be a good one.
Freddy
Follow Ups:
Oops, I forgot to mention the top end performance of the TD-15. I recall Nick mentioning that the useable response is up to nearly 2kHz. I think he had said that the high end of his prefference would be about 1.5kHz. In fact he had talked about offering a version with the TD-15 mated to either a Raven tweeter or a compression driver like the TAD. Obviously dispersion will narrow some at the upper octaves, but I imagine it could mate well to a horn of similar dispersion at the crossover point.
Agreed Freddy,I myself am not so much a fan of efficiency for the sake of efficiency, but the amplifier options, huge headroom, and mostly the reduced power compression are my main reasons for the interest. At the same time, my subwoofer design is rather compact for what it does.
The higher efficiency versions of the TD-15 woofer will prove very interesting indeed, and I'll be looking at the benefits/compromises between those for my design.
It's hard to realize how much heat is really getting dissipated with those 200W delivered. If we go back to the actual efficiency (no. in %) of the woofer itself, the percentage of power which isn't turned into acoustic output HAS to go somewhere. Most all of that power turns into heat. So, the more efficient versions of the TD15 will have less heat to dissipate with the same input, and obviously will also have more acoustic output for that same power input... Things get quite scarry, especially given the physical throw these drivers are capable of :-).
I'll post the T/S specs this afternoon.
Mark Seaton
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