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edjosh23 12th July 2005 03:29 PM

Pioneer 8" fun
I made an order from Parts express last week and decided to give myself a little gift. I wanted something to play around with that would be fun so I got a pair of Pioneer B20FU20-51FW woofers. I wanted to start breaking them in a little bit and once again found the box that they shipped in very useful.

I think this is going to be a very fun little project. I modeled the driver and I'm gonna build a somewhat massive box that is going to be tuned to around 32hz (I can't remember exact figures right now) but the bass from the 1ft^3 box is not bad. They also seem to go pretty high, but I think I am going to add a helper tweeter. Its really hard to say what they sound like right now, but they seem to sound superizingly good.

For the real box I wanted to try tonge and groove joints all around. I wanted to know if the box will be at all sturdy if it is over 3ft^3 with no screws only tonge and groove and glue.



P.S. Here are some pictures of my 1ft^3 box from PE.
Sorry the pictures were taken with my phone this morning.

Nelson Pass 13th July 2005 01:27 AM

I got a good price on 200 of them, so I found myself a $0.29
blow-out tweeter from P-E that goes perfectly with them,
coming in at 10 KHz with a 1 uF cap.


AJinFLA 13th July 2005 02:40 AM

I'm doing the same type of thing Nelson, with this and a tiny JBL tweeter I have from one of their SCS series satellites that I got from a friend - for free. I may even try mounting it coaxially (it's that small) by removing the dustcap of the QSL and using the whizzer as a waveguide for the tweeter (10k sounds about right). $9 well spent:D .



edjosh23 13th July 2005 05:23 AM

How do you guys like them?

I have been hearing lows of things about waveguides recently and AJinFLA I saw your orions and I really like the tweeters your have on them and I was wondering where you got the wave guide for them. I was actually gonna email you and ask you that because I want to try using that tweeter and I wanted to see if it would mate well with these pioneers.

Nelson Pass,
1. Glad to see you away from your home, although I have never talked to you I have heard great things about you.
2. 200 of them? why do you need that many?
3. Which tweeter?

What do you all think about tonge and groove only? Do you think the box will hold up without any screws and being so massive.

I'm at home now and the exact figures are 33hz in a 3.75ft^3 box.

Any recomendations tas to what to try out with this project? I'm gonna try out duct seal along with high fiber wool. Anything else?



sqlkev 13th July 2005 07:39 AM

That's quite a huge box.
Please also consider the room gain in your modeling. With that much low bottom end. I'm afraid the pioneer might sound a tad boomy.

I also have a pair playing in their test boxes right now and have yet to find the right tuning yet.
Will be pairing up with RS lineaum dipole tweeters.

zobsky 13th July 2005 03:28 PM

you might consider a replikon horn for that driver (see recent threads on this design) , .. might be a good thing

Nelson Pass 13th July 2005 08:27 PM

At $19, the BUFU driver is probably the best deal in
full range speakers. With a high impedance source,
say 8 to 15 ohms, it does quite well. With a voltage
source you definitely need the tweeter and back loading.

Not the same mid and top you would get from the others,
but a smooth inoffensive character typical of less sensitive
motors. It has a decent bottom end and will take a little
abuse. A little bit like a big Jordan.


AJinFLA 14th July 2005 02:48 AM

Hi Josh,

the waveguide used was a Pyle PH65. MCM has what appears to be the exact same thing which is what Zaph used here
The XT-19 was the best 3/4" tweeter I could find. More info here. This site is a must read for anyone who wants to build speakers, along with SL's, JBL,etc.
I'm holding judgement on the QSL until I have time to actually listen to it (too many projects), but hey, it was $9!
Which brings me back to your question. A XT-19 with the Pioneer?
I'm not sure why, unlesss you plan to use it as a "super" tweeter, but then why the waveguide? It certainly wouldn't be needed and thats a rather hi-end driver to be mated to the not so hi-end Pioneer. Lets put it this way. If you subjected the Pioneer to those type of (non-linear) tests above, things would get downright ugly.
The XT19 could be used as a supertweeter , but the better question is should it be used. I think it would be a waste of a fine driver.



My only "fullrange" project so far ;)

loninappleton 14th July 2005 05:55 AM

What about the lowly Voigt pipe for the Pioneer?

I think I asked this ages ago in another life cycle,
but that Voigt always comes back as a design I want
to build: one driver, tapered enclosure, port
at the bottom,.... done.


joe carrow 14th July 2005 06:54 AM


Originally posted by loninappleton
What about the lowly Voigt pipe for the Pioneer?

I think I asked this ages ago in another life cycle,
but that Voigt always comes back as a design I want
to build: one driver, tapered enclosure, port
at the bottom,.... done.


I modeled that a while ago, and it looks like it would work fairly well. The main problem is that it's a fairly large enclosure to build for a $20 driver.... though Nelson Pass's comment about how nice they sound with a high impedance source has me thinking a 3 cubic foot enclosure might not be a total waste of effort.

If you have the space, it looks like it could work.

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