Parameters for Pioneer B20FU20-51FW

jackfish · 3rd March 2009, 07:26 PM

Are these the correct parameters to use for the Pioneer B20FU20-51FW? http://www.partsexpress.com/pdf/290-045.pdf Or the published parameters from Pioneer?

GM · 3rd March 2009, 11:15 PM

Hard to say since the individual components are always being 'improved' by order of the 'bean counters' and retailers rarely bother to update their measurements like Eminence, JBL, etc., do. I mean I have measured specs from 10 yrs ago and they're not even close to the PE's, dictating a much smaller cab, so fortunately can be easily made to work with later driver's alignments, hence the specs that yields the largest cab are the ones I recommend since it's easier to shrink a cab than 'stretch' it.

GM

jackfish · 3rd March 2009, 11:38 PM

108 liters seems plenty big. F3 of 29 Hz is amazing considering all there is about this driver.

GM · 4th March 2009, 02:22 AM

Guess 'plenty big' is in the 'eye of the beholder', my fave B20 cab was a ~10.15 ft^3/30 Hz ML-horn........

GM

freddi · 4th March 2009, 02:26 PM

re:big - did it play clean? - - I've never heard B20 "clean" but only had it in modest size BR and pipe - - show me some two tone modulation tests - lol

GM · 4th March 2009, 02:39 PM

In the intended app, yes, but if you're asking if it defied the laws of physics or had the damping of a BP, of course not.

GM

Nelson Pass · 4th March 2009, 03:15 PM

I've got a bunch of these - I'll measure one tonight.

Scottmoose · 4th March 2009, 03:17 PM

That'd be useful. Thanks Nelson.

freddi · 4th March 2009, 03:54 PM

I've used B20 in a little klam at high spl - are they popular on flat baffle from 250 or so upward with helper woofer? - that and network runs the cost up

GM · 4th March 2009, 04:26 PM

The ML-horn started life as an OB with the B20's woofer variant filling the bottom end with a bit of added mass loading and a piezo horn nestled in the lee of the two in an absolute minimum driver spacing MTW. At apt./small room levels it was pretty impressive for the cost, but obviously there was only so much that could be done about the B20's basic mids/lower HF lack of high SQ resolution, so went for the low buck single driver in-room bass 'wow' factor plus piezo since it was for mostly '50s-60s DooWop, R&R, etc..

How'd it do in a Klam? I don't recall seeing any details/measurements of it.

GM

3rd March 2009, 07:26 PM	#1
jackfish diyAudio Member Join Date: May 2007	Parameters for Pioneer B20FU20-51FW Are these the correct parameters to use for the Pioneer B20FU20-51FW? http://www.partsexpress.com/pdf/290-045.pdf Or the published parameters from Pioneer?

3rd March 2009, 11:15 PM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Hard to say since the individual components are always being 'improved' by order of the 'bean counters' and retailers rarely bother to update their measurements like Eminence, JBL, etc., do. I mean I have measured specs from 10 yrs ago and they're not even close to the PE's, dictating a much smaller cab, so fortunately can be easily made to work with later driver's alignments, hence the specs that yields the largest cab are the ones I recommend since it's easier to shrink a cab than 'stretch' it. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

4th March 2009, 02:22 AM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Guess 'plenty big' is in the 'eye of the beholder', my fave B20 cab was a ~10.15 ft^3/30 Hz ML-horn........ GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

4th March 2009, 02:39 PM	#6
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	In the intended app, yes, but if you're asking if it defied the laws of physics or had the damping of a BP, of course not. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

4th March 2009, 04:26 PM	#10
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	The ML-horn started life as an OB with the B20's woofer variant filling the bottom end with a bit of added mass loading and a piezo horn nestled in the lee of the two in an absolute minimum driver spacing MTW. At apt./small room levels it was pretty impressive for the cost, but obviously there was only so much that could be done about the B20's basic mids/lower HF lack of high SQ resolution, so went for the low buck single driver in-room bass 'wow' factor plus piezo since it was for mostly '50s-60s DooWop, R&R, etc.. How'd it do in a Klam? I don't recall seeing any details/measurements of it. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.


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3rd March 2009, 11:38 PM	#3
jackfish diyAudio Member Join Date: May 2007	108 liters seems plenty big. F3 of 29 Hz is amazing considering all there is about this driver.

4th March 2009, 02:26 PM	#5
freddi diyAudio Member Join Date: Aug 2005	re:big - did it play clean? - - I've never heard B20 "clean" but only had it in modest size BR and pipe - - show me some two tone modulation tests - lol

4th March 2009, 03:15 PM	#7
Nelson Pass The one and only Join Date: Mar 2001	I've got a bunch of these - I'll measure one tonight.

4th March 2009, 03:17 PM	#8
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	That'd be useful. Thanks Nelson.

4th March 2009, 03:54 PM	#9
freddi diyAudio Member Join Date: Aug 2005	I've used B20 in a little klam at high spl - are they popular on flat baffle from 250 or so upward with helper woofer? - that and network runs the cost up

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