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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Best bass posted by rick57 on September 25, 2002 at 22:56:43:
Very interesting and ambitious project you have there, Richard! I was an amateur speaker builder for almost 20 years, and still dabble in it from time to time. But I never undertook anything as ambitious as your project.Most of my projects were transmission lines, but I do not recommend a transmission line for your application. A TL is not a sure bet, and in my opinion the main advantage of a TL over a transient-optimized reflex tuning is better midrange because the stuffing absorbs the backwave in the midrange. But your dipole PHL midrange will be better than a transmission line would have been.
The lower down you can maintain that high 95 dB efficiency, the better. So I'd say take your main speakers down to 40 Hz or so if you can. The very bottom octave can then be reproduced by a less efficient sub. This scheme will preserve the outstanding dynamics of your PHL mid and ribbon tweet over the widest range possible.
My personal suggestion would be to use a high quality 15" woofer from 300 Hz on down to the 40 Hz ballpark. This will almost certainly be a vented box, because woofers whose parameters give the kind of efficiency you want are best suited for vented boxes. If you are leaning towards the Lambdas, shoot me an e-mail. I know someone looking to sell a pair of TD15X's.
There are relatively few woofers that will take you all the way down to 18 Hz. I looked around and found an interesting 18" driver made by a company called "BluePrint". You would need equalization to get flat response down to 18 Hz, but this driver has enormous displacement capability (two inches peak-to-peak excursion) so it can take more equalization than most other drivers can. I've never heard this driver, so I'm not endorsing it - just mentioning it as a possible candidate for your subwoofer.
Duke
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Follow Ups
- Re: Best bass - Duke 09/26/0200:12:52 09/26/02 (4)
- Re: Best bass - rick57 01:41:06 09/26/02 (3)
- Transmission line problematics - Duke 03:36:51 09/26/02 (2)
- 10hz from a transmission line, - GTF 18:01:45 09/26/02 (1)
- Re: 10hz from a transmission line, - rick57 21:59:06 09/30/02 (0)
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