This is my version of the "Pass TL" that I built from a drawing that I saw somewhere on the Intrawebs. I am using a Pioneer BU20F20-51F (8" fullrange) and Dayton Audio ND20FA-6 (6 ohm tweeter) The Pioneer has a zobel and a baffle step compensation circuit, but no crossover. The Dayton tweeter has a 12db/oct L-R crossover at 7600 hz. The bass is surprisingly good, deep and articulate, considering it is a single 8" driver. I have built several different speakers with the Pioneer driver. Bought a bunch of them before they were discontinued. This is the best yet. These speaks are imaging champs. I have looked but have not seen any other builds from this design on the web. Would be interested in hearing from others who have built this.
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The Pioneer BU20F20 is a gem, too bad they stopped making them.
I have enough to float another Speaker Camp, and I understand that the
Brocks have an interest in doing it again.
🙂
I have enough to float another Speaker Camp, and I understand that the
Brocks have an interest in doing it again.
🙂
Well, under the product description they do say, "Ideal replacement for the Pioneer B20FU20-51FW (also known in DIY communities as the BOFU)"
If you trust the GRS marketing department, try it.
Why not? They retail for only 14 bucks!
If you trust the GRS marketing department, try it.
Why not? They retail for only 14 bucks!
Hosted at frugal-phile.com
http://frugal-phile.com/boxlib/Pass-BOFU-TL-map-010910.pdf
The new GRS is not really a decent substitute.
dave
Thanks for chiming in Planet10. It's good to hear from someone familiar with the originals. The original BOFU bibs auditioned at Burning Amp in Sausalito several years ago sounded great!
That's it! These speakers were relatively easy to build and sound amazing considering how inexpensive the drivers are. They are big, but produce enough bass in my room to not need a subwoofer and second amp/crossover. I am using them with a Harman Kardon Citation 5 amplifier (~30 watts/channel) and they get plenty loud in a 500 sq.ft. room.
There will be a couple pair of the Pioneers raffled at BAF this year,
courtesy of your truly....
🙂
courtesy of your truly....
🙂
Don't know. I suspect that the TL is tuned for the BOFU and a substitute driver would need similar T/S numbers.
I was looking at the frequency response graph printed with the plans. The bass response below 100 hz is pretty close to what I measured in my room with the mike about a yard directly in front of the BOFU. But, this doesn't take into account the contribution of the transmission line. With a 6db BSC circuit in line with the woofer, I get strong bass down to 40 hz in my room. When I first set them up, I was planning to use a bass boost circuit for the bass. Turns out these speakers don't need it.
The betsyK is a good (great) speaker (*commercial interest disclosure), but doesn’t have quite the excursion or power handling the bofu does.
I’ve tried the K in a TL designed for the Bofu and wasn’t thrilled. The WiBaq is designed for the K.
You might be interested to know that there are two pair of Betsy drivers
going to BAF this year for the raffle. They were sent to me several years
ago by the kind people at Wild Burro, and they are in excellent condition.
🙂
going to BAF this year for the raffle. They were sent to me several years
ago by the kind people at Wild Burro, and they are in excellent condition.
🙂
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