I'd like to do a simple build with the Pioneer B20 on an open baffle. I've read through most of threads but cannot seem to find an ideal baffle size.
I'm looking to put them in my game room which is 16'W X 30'L X 8'H.
Sourced from ipods, CD's and vinyl. Music is whatever i am listening to (classic rock, blues) to whatever my kids and their friends like (rock, country, hip hop). Maybe hook up the Xbox as well for gaming.
Could I do something 2'X4' with a tweeter or is that too big for the baffle?
Thanks
I'm looking to put them in my game room which is 16'W X 30'L X 8'H.
Sourced from ipods, CD's and vinyl. Music is whatever i am listening to (classic rock, blues) to whatever my kids and their friends like (rock, country, hip hop). Maybe hook up the Xbox as well for gaming.
Could I do something 2'X4' with a tweeter or is that too big for the baffle?
Thanks
OB is really easy to experiment with. You can make test baffles out of cardboard and try different sizes really easily. You can also play with Home of the Edge
repeddler,
Check out the design on my site under projects. Unfortunately, OB's generally need to be large to get decent extension (unless like MJK, you are balancing a very high Qts with a narrower baffle). A 2' x 4' ain't going to get you very low. Think 4' x 4'. That's why mine is folded! The Qts on the B20 is pretty low to go it alone (without a woofer), so you might consider doing something to raise the Qes (and with it, the effective Qts). If you've got a tube amp with a high output impedance (many do), you might already be there. But, also consider using particularly small speaker wire. First, 24g Cat5 (I like the plenum stuff), and if that isn't enough bass, maybe something 30g (Radio Shack's wire wrap wire or magnet wire). If that doesn't work, you can always add series resistors. Keep in mind that you can not build a baffle to big if the speakers Qts is around .7 or lower. If you go the size of mine, and you get the effective Q up to around .7, you can expect to get down to 70hz +whatever room gain gives you.
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
Check out the design on my site under projects. Unfortunately, OB's generally need to be large to get decent extension (unless like MJK, you are balancing a very high Qts with a narrower baffle). A 2' x 4' ain't going to get you very low. Think 4' x 4'. That's why mine is folded! The Qts on the B20 is pretty low to go it alone (without a woofer), so you might consider doing something to raise the Qes (and with it, the effective Qts). If you've got a tube amp with a high output impedance (many do), you might already be there. But, also consider using particularly small speaker wire. First, 24g Cat5 (I like the plenum stuff), and if that isn't enough bass, maybe something 30g (Radio Shack's wire wrap wire or magnet wire). If that doesn't work, you can always add series resistors. Keep in mind that you can not build a baffle to big if the speakers Qts is around .7 or lower. If you go the size of mine, and you get the effective Q up to around .7, you can expect to get down to 70hz +whatever room gain gives you.
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
If you can choose a driver tailored for OB you might have better luck. And you will be able to get away with a smaller baffle.
I've not heard the Wild Burro Betsy, but it seems a good bet, and not much more expensive than the B20.
I've not heard the Wild Burro Betsy, but it seems a good bet, and not much more expensive than the B20.
Hey, thanks for suggestions and links. Looks like I'm going to have to give it some more thought.
have you give a look at godzilla OB project? it will make some more hip and some more hop than a simple ob driver i think... http://www.diyaudio.com/forums/full-range/155213-betsy-boomer-ob-speaker.html
That speaker is acoustic suspension, meant for an enclosed system. It will not give it's intended respones on an open baffle. A 2'x4' baffle board wiil also cause problems. 1 to 1, 1 to 2, ratios on a baffle board will cause harmonic "distress" Yours is 1 to 2, and way too large for the speaker. I'd start, with a 10", at 13"W X21"H and 11 1/2" deep. Over-all dimensions.
What is harmonic "distress" and why do baffles with that ratio cause problems?
Well, I don't like to use the words cancellation, or resonance to describe the effect. So, distress seems a better term.
That said, most speaker enclosures are design to enhance bass response. So, if a wave travels the same distance along the baffle board, in both directions, in response to a certain wavelength, the baffle board will become a "speaker". Also, a doubled length will produce the same result. Past that ratio, makes no difference.
Now in electric guitar (not electric bass), the opposite is true. You design the cabinet to enhance certain frequencies. Also, any other cabinet designed to enhance a certain instrument.
All other situations, the speaker is desirable to reproduce a "flat" response thru all frequencies
That said, most speaker enclosures are design to enhance bass response. So, if a wave travels the same distance along the baffle board, in both directions, in response to a certain wavelength, the baffle board will become a "speaker". Also, a doubled length will produce the same result. Past that ratio, makes no difference.
Now in electric guitar (not electric bass), the opposite is true. You design the cabinet to enhance certain frequencies. Also, any other cabinet designed to enhance a certain instrument.
All other situations, the speaker is desirable to reproduce a "flat" response thru all frequencies
I've read through a couple more of the threads and links you guys have suggested, and see now that this driver is not well suited for OB. I had bought them a while back,but I'll build something else and wait on the OB till another time.
Martin's design looks good as well as Paul's Betsy. Guess it depends on how much dough I want to put into them.
Thanks again.
Martin's design looks good as well as Paul's Betsy. Guess it depends on how much dough I want to put into them.
Thanks again.
>>> this driver is not well suited for OB. I had bought them a while back,but I'll build something else and wait on the OB till another time.
I simmed charts of the B20 on ob and will post them again next week when i get back to office... it went down to about 200hz. I have them on ob but with woofers beneath them so they sound full... without the woofers they still make music but are not reaching their potential. They also need a tweeter to sound their best too. It's a good driver and can be used successfully in many ways.
Godzilla
I simmed charts of the B20 on ob and will post them again next week when i get back to office... it went down to about 200hz. I have them on ob but with woofers beneath them so they sound full... without the woofers they still make music but are not reaching their potential. They also need a tweeter to sound their best too. It's a good driver and can be used successfully in many ways.
Godzilla
I simmed these drivers on open baffle to see if they made it to 200hz so i can blend a woofer in (also on open baffle). The B20 sounded great actually. I have been rolling drivers on the same baffle for the last month. The Betsy, B20, PE Buyout and TB 1808 all sound great. The TB sounds best, having the most expressive midrange.
Godzilla
Godzilla
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