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Old 15th December 2007, 06:56 AM   #1
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Default Pioneer B20FU20-51FW 8 TL?

hey everyone this is my first time being here...I'm new to home audio stuff. Normally I design and build sub boxes for me and friends.

I was wanting to build a transmission line for a couple of these speakers.

http://www.partsexpress.com/pe/pshow...TOKEN=58605347

Should I design the enclosure based on the 1/4 wavelength of the drivers FS??

Will it even sound good in a TL??
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Old 15th December 2007, 07:28 AM   #2
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Default Re: Pioneer B20FU20-51FW 8 TL?

Quote:
Originally posted by aznboi3644
Will it even sound good in a TL??
I'm pretty sure there is an ML-TL for these... the BIB and Chang. Half-Chang & Curvy Chang are popular. Add an appropriate tweeter and these are reported to so amazing well (and not only for their price.

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Old 15th December 2007, 06:03 PM   #3
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I just built the Half chang and its definitely something to consider, bass is powerful but not overpowering with no immediate need for a subwoofer, I'll post a full review when they are pretty enough to show off
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Old 15th December 2007, 10:01 PM   #4
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Quote:
Originally posted by Fast1one
I'll post a full review when they are pretty enough to show off
Using this line of reasoning, I'd never post one.
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Old 15th December 2007, 10:34 PM   #5
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Default Re: Pioneer B20FU20-51FW 8 TL?

Quote:
Originally posted by aznboi3644

Should I design the enclosure based on the 1/4 wavelength of the drivers FS??

Will it even sound good in a TL??
Greets!

I don't see why not, it's worked well in a wide variety of cab alignments me and others have designed/built already, though only Nelson Pass's is a TL per se AFAIK, which is buried in this recent thread along with some other designs: Why not much on Pioneer B20 MLTL?

Anyway, typically you design it a bit < 1/4 WL of Fs since the stuffing's resistance will shift Fp lower. MJK's Classic TL alignments will calc them based on Polyfil's resistance: http://www.quarter-wave.com/Theory/Alignment_Tables.pdf

GM
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Old 15th December 2007, 10:59 PM   #6
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Quote:
Originally posted by GM


Using this line of reasoning, I'd never post one.
Very true! I will have to post it soon, maybe tomorrow...
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Old 16th December 2007, 06:59 PM   #7
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I did a search for the half chang...to looks like it will fit the bill

I tried searching for the how to on building it...came up with nothing.

Anyone got a link??

Thank you
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Old 16th December 2007, 07:39 PM   #8
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Do you mean plans? http://www.frugal-horn.com/spawn-plans.html
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Old 17th December 2007, 04:00 AM   #9
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Quote:
Originally posted by GM
Using this line of reasoning, I'd never post one.
Ha! That's coming from the man who used to build speakers with nothing but hand tools in the parking lot of his apartment building.
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Old 17th December 2007, 05:30 AM   #10
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I resemble that remark! If I couldn't 'slam' a pair together in an afternoon I was goofing off way too much. Not that having power tools helped, though in my defense it was just a proof-of-concept made from house repair scraps to showcase Dave p10's doped/plugged 40-1197s:

Anyway, I normally left the finishing to the end user. For myself I didn't care since they were always big/loud enough that hiding them behind open weave drapes was easiest.

GM
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