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Multi-Way Conventional loudspeakers with crossovers

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Old 28th September 2010, 08:53 AM   #7371
Jmmlc is offline Jmmlc  France
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Hello Panomaniac,

Yes, there is some noise on the spectrogram (purple on black) and the pulse is designed "by hand", in order to show all the colors.

Best regards from Paris,

Jean-Michel Le Cléac'h


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Originally Posted by panomaniac View Post
That's a good one JM. Do I see a pulse with more slightly more energy at the low end? And background noise (magenta) before and after the pulse? If so, it works for me.
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Old 29th September 2010, 06:17 PM   #7372
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I'm on page 100 of Bob Cordell's Power Amplifier book. My comments are here. As a former technical writer for Tektronix, I feel it is one of the best technical books I've ever read, even if your interest is limited to loudspeakers or tube amps. Get it, read it thoroughly, and learn a few things about that mysterious black box you've been listening to for all these years.

Last edited by Lynn Olson; 29th September 2010 at 06:20 PM.
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Old 29th September 2010, 07:02 PM   #7373
ra7 is offline ra7  United States
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Lynn,

May I ask, which other books in your opinion, can stand alongside Bob's latest one? In other words, which ones would you say are a "must read?"
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Old 30th September 2010, 04:50 AM   #7374
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It's a short list:

Bob Cordell Designing Audio Power Amplifiers

Morgan Jones Valve Amplifiers, Third Edition

Morgan Jones Building Valve Amplifiers

Ben Duncan High Performance Audio Power Amplifiers

Ralph Morrison Grounding and Shielding Techniques

Newell and Holland's Loudspeakers - For Music Recording and Reproduction

Earl Geddes, "Audio Transducers" (order direct from Gedlee)

These are the books on my reference bookshelf, along with old-timers like the RCA Radiotron Designer's Handbook (4th edition), Valley and Wallman "Vacuum Tube Amplifiers", HF Olson's "Acoustical Engineering", every issue of Sound Practices, Vacuum Tube Valley, and Speaker Builder magazines, along with Audio Amateur going back to 1971. Also the AES Journal from 1971 through the early 80's.

Unless you are researching the history of audio, the books in the top list are the ones to get. Yes, they are pricey. If that's an issue, start with Newell and Holland, and then get either Bob Cordell's book (if you're into transistors), or Morgan Jones' book (if you're into vacuum tubes). If you are a beginner, get the Loudspeaker Design Cookbook by Vance Dickason.

Last edited by Lynn Olson; 30th September 2010 at 04:57 AM.
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Old 30th September 2010, 02:54 PM   #7375
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How could you leave out Toole's book? Granted Earl's book has some information on psychoacoustics, but Toole's book has tons of valuable information in it. If you don't know how your brain interprets what the speakers produce, then you have little basis for effectively applying information in any of those other books so in my world it's at the top of the list.
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Old 1st October 2010, 06:44 PM   #7376
ra7 is offline ra7  United States
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Quote:
Originally Posted by Lynn Olson View Post
Unless you are researching the history of audio, the books in the top list are the ones to get. Yes, they are pricey. If that's an issue, start with Newell and Holland, and then get either Bob Cordell's book (if you're into transistors), or Morgan Jones' book (if you're into vacuum tubes). If you are a beginner, get the Loudspeaker Design Cookbook by Vance Dickason.
Thanks Lynn... I'll start with one or two of the ones you suggested.
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Old 4th October 2010, 08:26 PM   #7377
ScottG is offline ScottG  United States
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This is the first product sheet (for this tweeter) I've seen:

https://www.madisound.com/store/prod...oducts_id=8954
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Old 4th October 2010, 08:43 PM   #7378
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Quote:
Originally Posted by ScottG View Post
This is the first product sheet (for this tweeter) I've seen:

https://www.madisound.com/store/prod...oducts_id=8954
That's some FR plot. I take it that it was done sans baffle.
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Old 4th October 2010, 08:46 PM   #7379
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Quote:
Originally Posted by ScottG View Post
This is the first product sheet (for this tweeter) I've seen:

https://www.madisound.com/store/prod...oducts_id=8954
Cool!
I just noticed this new compression driver from radian.
http://www.radianaudio.com/component...les/745NEO.pdf
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Old 4th October 2010, 09:53 PM   #7380
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RAAL has also recently announced a dipole ribbon tweeter. I found this early documentation. Personally, I would minimize the baffle area by separating the ribbon's transformer off of the front mounting plate.

www.solen.ca/pdf/raal/DIPOLE140-15D.pdf

A DIY dipole ribbon tweeter is simple to construct from 0.5" x 0.5" NdFeB N50 magnets and some 0.5" square 1018 steel. I build 4" long x 0.7" wide dipole ribbons which can easily be crossed at 1,500Hz, and mount it on top of no-baffle Lambda TD15D or Tang Band W8-1808 mids. Material cost ~ $50. A no-baffle dipole ribbon tweeter has modest area required for good dispersion.

I wonder if a Fish Speaker would sell well in the Pacific North West.
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