Now what can I do with these?

weinstro · 21st October 2008, 05:37 AM

Hello All,

I attended Burning Amp 2008 yesterday and had a very nice, educational time. A raffle was held mid-day and I won some drivers from Nelson Pass.

- 4 Pioneer B20FU12W 8" full range drivers
- 8 really small tweeters

My quick research on this forum reveals:
- these things have been around for a while
- people have tried open baffle, sealed, and TL
- people like to tweak them
- a well documented design isn't easy to find
- the tweeter seems to be needed, but the selection of crossover frequency seems to be highly variable
- it's a great driver if your expectations are low enough

Any suggestions on what to build?

Is there any distortion data available for the B20?

I'd like something decent, but not hugely sized. I'd prefer to not tweak the driver excessively.

I can power these with a Dynaco tube amp, it that improves my acceptance on the full-range forum.

Thanks!

hifimaker · 23rd October 2008, 12:30 AM

The no brainer build is a BIB speaker using the Pioneer drivers and the whizzer tweeters with a simple 1st order crossover.

Search the site for BIB pioneers, and Variac's plans will pop-up.

They sound really great and much better than they should!

-David

Godzilla · 23rd October 2008, 12:58 AM

- it's a great driver if your expectations are low enough

LOL! It's true. But i have a musician friend that loves them and he's heard many other expensive speakers. I think they just float his boat like no other.

planet10 · 23rd October 2008, 01:22 AM

Quote:

Originally posted by weinstro
- a well documented design isn't easy to find

Pass TL
http://homepage.mac.com/tlinespeaker...map-300408.pdf

BIB
http://homepage.mac.com/tlinespeaker...ans-311007.pdf

G Chang double mouth MooseBVR
http://homepage.mac.com/tlinespeaker...map-170608.pdf

Half Chang single mouth MooseBVR
http://homepage.mac.com/tlinespeaker...map-170608.pdf

You'll have to email me for Curvy Chang plans and there exists designs for both a 2 x B 20 double mouth Spawn and IIRC a monster ML-TL (those last 2 are not well documented althou the former has been built and there are pictures on the forum).

dave

Trooper46 · 23rd October 2008, 02:59 AM

god this reminds me that i have to start working on my HC soon before it gets to cold to run a table saw in the garage.

lousymusician · 23rd October 2008, 04:19 AM

I built half-Changs for the pair of B20s I got at Burning Amp 2007. They work very well. WAF was too low to do teh full Changs.

weinstro · 24th October 2008, 06:36 AM

Man, those are big. VAS must be infinity. Maybe I'll make them "patio" speakers.

Anyone done an open baffle with this driver? Joy?

I'll figure out how to email you tomorrow.

Thanks!!

21st October 2008, 05:37 AM	#1
weinstro diyAudio Member Join Date: May 2003 Location: California	Now what can I do with these? Hello All, I attended Burning Amp 2008 yesterday and had a very nice, educational time. A raffle was held mid-day and I won some drivers from Nelson Pass. - 4 Pioneer B20FU12W 8" full range drivers - 8 really small tweeters My quick research on this forum reveals: - these things have been around for a while - people have tried open baffle, sealed, and TL - people like to tweak them - a well documented design isn't easy to find - the tweeter seems to be needed, but the selection of crossover frequency seems to be highly variable - it's a great driver if your expectations are low enough Any suggestions on what to build? Is there any distortion data available for the B20? I'd like something decent, but not hugely sized. I'd prefer to not tweak the driver excessively. I can power these with a Dynaco tube amp, it that improves my acceptance on the full-range forum. Thanks!

23rd October 2008, 12:58 AM	#3
Godzilla diyAudio Member Join Date: Nov 2005 Location: New York	- it's a great driver if your expectations are low enough LOL! It's true. But i have a musician friend that loves them and he's heard many other expensive speakers. I think they just float his boat like no other. __________________ www.zillaaudio.com/bib/bib.asp www.ZillaAudio.com

23rd October 2008, 04:19 AM	#6
lousymusician diyAudio Member Join Date: Nov 2005 Location: NorCal	I built half-Changs for the pair of B20s I got at Burning Amp 2007. They work very well. WAF was too low to do teh full Changs. __________________ The difference between theory and practice is that in theory there is no difference between theory and practice, but in practice there is.

24th October 2008, 06:36 AM	#7
weinstro diyAudio Member Join Date: May 2003 Location: California	Re: Re: Now what can I do with these? Man, those are big. VAS must be infinity. Maybe I'll make them "patio" speakers. Anyone done an open baffle with this driver? Joy? I'll figure out how to email you tomorrow. Thanks!!

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23rd October 2008, 12:30 AM	#2
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	The no brainer build is a BIB speaker using the Pioneer drivers and the whizzer tweeters with a simple 1st order crossover. Search the site for BIB pioneers, and Variac's plans will pop-up. They sound really great and much better than they should! -David

23rd October 2008, 02:59 AM	#5
Trooper46 diyAudio Member Join Date: Aug 2008	god this reminds me that i have to start working on my HC soon before it gets to cold to run a table saw in the garage.

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