Parameters for Pioneer B20FU20-51FW - diyAudio
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Old 3rd March 2009, 07:26 PM   #1
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Default 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?
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Old 3rd March 2009, 11:15 PM   #2
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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.

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Old 3rd March 2009, 11:38 PM   #3
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108 liters seems plenty big. F3 of 29 Hz is amazing considering all there is about this driver.
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Old 4th March 2009, 02:22 AM   #4
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Guess 'plenty big' is in the 'eye of the beholder', my fave B20 cab was a ~10.15 ft^3/30 Hz ML-horn........

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Old 4th March 2009, 02:26 PM   #5
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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
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Old 4th March 2009, 02:39 PM   #6
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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.

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Old 4th March 2009, 03:15 PM   #7
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I've got a bunch of these - I'll measure one tonight.

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Old 4th March 2009, 03:17 PM   #8
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That'd be useful. Thanks Nelson.
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Old 4th March 2009, 03:54 PM   #9
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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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Old 4th March 2009, 04:26 PM   #10
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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.

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