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BOFU with and w/o whizzer cone ?

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Posted on July 14, 2012 at 13:18:24
floydandrews
Audiophile

Posts: 192
Location: SF Bay area
Joined: December 29, 2003
Anybody measure the high frequency response of the Pioneer BOFU before and after a "whizzerectomy"?

 

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Oooh I hope so, posted on July 14, 2012 at 16:41:48
badman
Reviewer

Posts: 8793
Location: Tustin, CA (Orange County)
Joined: March 10, 2001
Would love to see it since I use a supertweeter with my BOFUs anyway.



Bass is supposed to sound big. 6.5" is not a woofer size.


 

RE: Measurements, posted on July 14, 2012 at 17:06:17
Don M
Audiophile

Posts: 180
Joined: July 17, 2000
Did you take any measurements of your BOFU tl project after you added the tweeter?

 

RE: BOFU with and w/o whizzer cone ?, posted on July 14, 2012 at 17:23:07
Don M
Audiophile

Posts: 180
Joined: July 17, 2000
You may find the article linked below on the BOFU interesting.

Jeff Poth has written some excellent articles for the DIY community.

 

no but.............., posted on July 15, 2012 at 04:40:47
Norman Bates
Audiophile

Posts: 544
Joined: August 9, 2002
I played with it for a while.

Using a 10 band eq on a stock driver, I had a squeek of boost at 8khz and a little at 16khz. I also had cotton batten between whizzer and cone down by the voice coil.

I trimmed maybe 1/8 off the whizzer (a little) and I needed a bit more boost at 8khz and more at 16khz, but the honkyness improved a little also. It was better overall.

I then cut off all the whizzer, and the honky ness was gone !!!! But I couldn't eq in the high end. 8khz and 16khz sliders made no difference in the high end.

If I measured it after cutting the whizzer off, I'm sure that I'd have seen more of a climb from 1khz to 5khz then it roll off very steeply past that. Whizzers usually put out the really high stuff (like 5khz plus) and they also act out of phase for an octave, maybe 2 under it. By acting out of phase, it lowers the freq response of the driver there compared to the same driver without a whizzer.

This guy cut the whizzer off his coral flat 8 and made measurements. Removing his whizzer also narrowed his dispersion from 2khz to 4khz also.
http://www.diyaudio.com/forums/full-range/185012-whizzer-intelligibility.html

Interesting read.

Norman

 

RE: BOFU with and w/o whizzer cone ?, posted on July 15, 2012 at 17:37:46
freddyi
Audiophile

Posts: 2783
Joined: December 6, 2001
even the original BOFU was nothing to write home about other than being cool for around $15 - here's one NOS in a Druid type pipe vs a Fostex FE206EN (both ~on-axis) At least the old BOFU didn't have a 2K6 spike like my 206 :^)


Karlson Evangelist

 

No , posted on July 16, 2012 at 10:51:12
badman
Reviewer

Posts: 8793
Location: Tustin, CA (Orange County)
Joined: March 10, 2001
Though I should have. In my case it's a pretty straightforward design.



Bass is supposed to sound big. 6.5" is not a woofer size.


 

"nothing to write home about", posted on July 25, 2012 at 15:52:05
badman
Reviewer

Posts: 8793
Location: Tustin, CA (Orange County)
Joined: March 10, 2001
Certainly not your taste- but it's a milder sounding fullranger that can actually do some real bass- that's a nice combo, you get some of the fullrange clarity/"speed", but without the limited output/bass, or the shrieking high end.





Bass is supposed to sound big. 6.5" is not a woofer size.


 

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