Pioneer B20 in a sealed stand mount

[Coreyk78]

Hi all, I have read a lot of the threads on the forum here about the Pioneer B20FU20-51FW but I don't know if I found them all since the search tool won't accept 3 character search terms. So sorry for yet another B20 thread but I didn't know where to put my post.

I want to build a nice little cheap project using some Pioneer B20s loosely following Godzilla's sealed design. Rather than building tall floor standers I was thinking of building some short and fat standmounts with internal dimensions of 22"H x 9.75"W x 10.5"D which would give me 1.3 ft^3 like Godzilla used. I would like to use the goldwood piezo tweeter, but mounted on the front of the cab with an 8 ohm resistor and crossed somewhere between 6-10khz. Bass extension below 80hz is not important to me, I have a sub to fill that in.

Any reason why this box shape absolutely wouldn't work? Otherwise I'm going to go ahead and build it with some 3/4" MDF, worst case if it sounds bad I can build different cabinets and scrap the short and fat ones.

[mrybczyn]

I used similar dimensions in a 1.3 ft^3 sealed cabinet and was rather dissapointed with the sound of the B20s. Muddy bass, low SPL, and nonexistent highs. Not a fan of the B20s.

Cheers,
Mitch

[norman bates]

Well, once you put some loose cotton balls between driver and whizzer, and I had it in a large empty sealed box (qtc .577 or 1' deep x 2' wide x 3' tall) I loved it. When I had it in a smaller 1.7ft3 sealed box with sand filled walls, it was shouty and more cupped, more saxophone honky, echoy sound. I think the smaller enclosure size had everything to do with it. It was the same driver.

I had better results trimming 1/4 of the whizzer off but then I had to boost the highs even more with a 10 band eq, but it was less echoy than the un trimmed whizzer with no eq.

But many seem unable to deal with a larger box.

Once you push the baffle step low, it sounds much better.

Norman

[Godzilla]

Single Driver Website

I used the B20 in a .75 cubic foot box and it sounds good. piezo on front just like you want too.

some love this driver and some dont... i think its a good deal.

Godzilla

[Coreyk78]

Originally Posted by Godzilla

Single Driver Website

I used the B20 in a .75 cubic foot box and it sounds good. piezo on front just like you want too.

some love this driver and some dont... i think its a good deal.

Godzilla

Thanks for that link Godzilla, it appears you already built exactly what I was thinking of.

[gychang]

I am also very fond of B20 speakers, recently I finished a test version vented as detailed here: Dark Vador speaker!, test version

I am very interested in coupling with the piezo tweeter (I have several in the garage) also. B20 indeed is worthwhile project, I agree it has a nonfatiguing sound once the size of vent is figured out correctly. I am very interested in all projects with B20...

gychang

[badman]

I used this in a 25L box, tuned to 25/30 with a slot port. Worked well to give a little BSC boost. The driver absolutely needs a supertweeter to my ears, however.

[gychang]

Originally Posted by badman

I used this in a 25L box, tuned to 25/30 with a slot port. Worked well to give a little BSC boost. The driver absolutely needs a supertweeter to my ears, however.

any pictures and details of BSC boost?, I totally agree B20 needs supertweeter above 10K.

gychang

[Coreyk78]

Originally Posted by gychang

I am also very fond of B20 speakers, recently I finished a test version vented as detailed here: Dark Vador speaker!, test version

I am very interested in coupling with the piezo tweeter (I have several in the garage) also. B20 indeed is worthwhile project, I agree it has a nonfatiguing sound once the size of vent is figured out correctly. I am very interested in all projects with B20...

gychang

Hi gychang, reading some of the other threads that you were involved in is what convinced me that I wanted to try out the B20. I find that I generally prefer a more laid back sound so I'm really excited to hear how they play. Plus the low cost is a definite bonus! I can buy all the parts to build a pair of speakers for just a little more than a single Fostex FE207 driver