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Old 31st August 2004, 05:36 AM   #21
navin is offline navin  India
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what do you guys consider fullrange? 100-20k at 90db min acorss the entire range?
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Old 31st August 2004, 06:47 AM   #22
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Default Re: FE206E ML TL

Quote:
Originally posted by gmilitano
The FE206E (and 208E) has already been designed.

http://www.quarter-wave.com/Project05/Project05.html
Thanks for the link, but I was thinking of building Voigt Pipes. Can anyone provide dimensions & details about using the FE206E with them?
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Old 31st August 2004, 07:13 AM   #23
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Quote:
Originally posted by navin
what do you guys consider fullrange? 100-20k at 90db min acorss the entire range?
For a small driver ~80-100 to 15K qualifies in my book. The sensitivity has nothing to do with range but will affect distortion and definitely matters if the goal is a single driver speaker to run off a low power tube amp. For this application I like to see better than 95 dB.

A larger 12" FR would not be FR to me if it didn't go down to 40 Hz.
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Old 31st August 2004, 08:13 AM   #24
Nuuk is offline Nuuk  United Kingdom
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Quote:
A larger 12" FR would not be FR to me if it didn't go down to 40 Hz.
Don't try one on an open baffle then!
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Old 31st August 2004, 11:48 AM   #25
navin is offline navin  India
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Quote:
Originally posted by rcavictim
For a small driver ~80-100 to 15K qualifies in my book.... For this application I like to see better than 95 dB....A larger 12" FR would not be FR to me if it didn't go down to 40 Hz.
so this really means mostly 4" or larger drivers. the smaller "widerange" drivers I know cant do 95db at 100hz. are not larger drivers prone to beaming?
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Old 31st August 2004, 12:35 PM   #26
polsol is offline polsol  South Africa
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Just my tuppence worth but what ever happened to the Altai drive units as were used in the Kappellmeister DIY loudspeaker? Are they still available or, more to the point, were they any good?

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Old 31st August 2004, 01:05 PM   #27
jomor is offline jomor  Greece
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Check this too

http://home.new.rr.com/zaph/audio/audio-speaker11.html
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Old 31st August 2004, 01:13 PM   #28
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Quote:
I have just found a spreadsheet on the web for calculating Pipe dimensions.
Please be aware that the Excel spreadsheet based on Weems criteria is not accurate. You'll get much better results from learning to use MJK's MathCAD worksheet.
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Old 31st August 2004, 05:05 PM   #29
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Default Re: Pioneer full range

Quote:
Originally posted by gmilitano
Which Pioneer driver are you refering too and where is it available?
Taht would be the BU20FU20-51F, and it's available from
Parts express, although you can also check MCM and Madisound.

More information is available on the article on www.firstwatt.com
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Old 31st August 2004, 05:30 PM   #30
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Quote:
Originally posted by navin


so this really means mostly 4" or larger drivers. the smaller "widerange" drivers I know cant do 95db at 100hz. are not larger drivers prone to beaming?
Drivers that can do 95 dB at below 100 Hz are very hard to find I think. The output on most drivers drops like a stone below about 150-200Hz. The manufacturers use 'averaged SPL' at 1w/1m between the range limits to get a better sensitivity specification that can be misleading when expecting good output at the lowest octaves IME.

HF beaming is bad on some large drivers and makes them unsuitable for FR operation. Besides beaming is the doppler distortion issue of the bass moving the HF source towards and away from the listener. Some of the drivers in 12" size from makers like EV or Jensen from the Golden Age in the 50's/60's I have had a chance to play with offer high efficiency and are claimed to be full range. They do not have a significant beaming problem and the doppler is also acceptably low. Wizzer cones were often employed and I think cone profiles and stiffness were used to advantage as well. I wish the best of these vintage FR speakers with efficiencies in the high 90's were being manufactured today. They can be just the thing for low power tube amp applications, the reason they were designed some 50 years ago.

I've found commercial sound reinforcement drivers tend to have higher sensitivity specs but don't tend to go low enough for home use in the 12" and 15" sizes. An Fs of 55 Hz on a 15" driver is not good for nice low bass. There are of course exceptions.
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