Ultimate Open Baffle Gallery

[TerryO]

That almost naked Lowther in #1582 had been posted here somewhere years ago.

Actually both of them are retreads from the past.

Best Regards,
TerryO

 

[Rob41]

Here's the open baffle line array (OBLA-33) speakers I just finished.

 

[Poultrygeist]

Rob,

I think they're the "Ultimate" of the Ultimate OB Gallery.

 

[Rob41]

Wow, thanks so much! They may be the best sounding speakers I've ever heard, but there isn't a shortage of speakers in this gallery with craftsmanship far beyond my own.

 

[gainphile]

Very impressive !

 

[crazyfrog]

What a "knockout" effect!

 

[Rockaway]

What is the impedance for the line array?

Thanks,

Jason

 

[PMA!]

Yeah, and I'd probably run into that limit pretty quickly with my listening habits, I'm just wondering what the expected response on a slob like this is, I.E how far does it go down without help.

I've been flirting with the idea of trying a really big slot loaded device for a while. Call it morbid curiosity, wondering how many woofers of what size I'd need to get something that's competitive in output and extension with a typical tuned enclosure subwoofer.

I have a feeling I'd need a used Porsche worth of RE-XXXs to make it work.

I easily get 20hz in my room without much EQ, but my room does not sound good with much output below 30.

I really like playing loud (!) music at times, and the woofers barely move. Of course these are low x-max underhung woofers. I would not use high excursion woofers for a slob with high compression, the whole idea of the high compression is the feeling of absolute control and dynamics. The same goes for this kind of "tight" woofer.

 

[Rob41]

Very impressive !

What a "knockout" effect!

Thank you guys!

What is the impedance for the line array?

Thanks,

Jason

Jason, I'm using an active crossover and multiple amps so there isn't one overall impedance. The tweeters have an impedance of 6.9 ohms while the mid-woofers have an impedance of 5.6 ohms.

 

[Rockaway]

Thanks Rob.

Just noticed your in Northern MI.
Went to school at Interlochen Center for the Arts. Grew up in A2. Would love to move to Acme with a view of the lake.......one day

Jason

 

[Rob41]

Thanks Rob.

Just noticed your in Northern MI.
Went to school at Interlochen Center for the Arts. Grew up in A2. Would love to move to Acme with a view of the lake.......one day

Jason

Cool. I'm fortunate to live on the Black River in Cheboygan, just a short boat ride to the lake.

 

[Silent Screamer]

That's very risky

Some other finding:
www.technologytell.com/hometech/59783/functional-audio-art-a-qa-with-randy-kunin-of-sounds-by-design/

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Looks like a cut down of my "Ugly Man" design from a couple of years ago. http://www.diyaudio.com/forums/multi-way/215994-first-time-ob-builder-33.html

 

[jonnoshore]

Looks like a cut down of my "Ugly Man" design from a couple of years ago. http://www.diyaudio.com/forums/multi-way/215994-first-time-ob-builder-33.html

This is a good English read

Thanks for the link, which found this..

http://www.dipolplus.de/downloads/Open baffle 1.pdf

 

[MickRS]

Eminence Alpha and Tang Band 1808. Uses an active filter with (adjustable) dipole correction as pre-amp. I know, heavily inspired by Zev's speakers, but the filter allows a smaller baffle. That filter and some extra tweaks does set it apart from the speakers they were based on...

Still sanding my B-hind of to get that piano gloss finish though...

 

[MITsound]

But first

Not sure this is the right place for this, but I love cheap tweaks.
Tried a really basic LCR RFI filter on the speaker wire feeding my open baffle Markaudio 12p pair.
About 10 minutes a channel to build, with stuff I had lying about, would've cost @ $2.
And well worth it.
Sounds a little cleaner, and images a little wider and taller.

 

[superlian]

One of my recent projects: Audio Nirvana Super 8 Alnico and Acoustic Elegance Dipole 10.

 

[superlian]

And another project i made for my cousin. Tiny Alnico Open Baffle by Jon Vêr Halen. Lowther PM6A and Tone Tubby Red Alnico with hemp paper. Fantastic drivers.

An externally hosted image should be here but it was not working when we last tested it.

 

[superlian]

I did some measurement of the original first order crossover and it didnt measure well, i also heard that the TAOB speaker had more potensial. That because i have used Lowther PM6A in open baffle before with First Watt B5 with god results.

 

[superlian]

My filter who is more coherent with even frequency response. I made a little midbass bump because i like it

Lowther PM6A:
12 dB high pass: 33uF serie - 1,8 mH parallell
Serie notch: 3,3 uF / 0,1 mH / 27 ohm

Tone Tubby:
12 dB low pass: 5,6 mH serie - 100 uF paralell

With and without notch. It is absolutely neccesary.

 

[Face]

My work in progress.