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Pass Open Baffle: need help
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Old 7th August 2017, 01:12 PM   #241
Kjeldsen is offline Kjeldsen  Denmark
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I have tested this woofer i various open baffles, and find it to be very good for the price (approx 200$)

http://www.gladen.com/GladenWooferPDFs/RS15FA.pdf
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Old 7th August 2017, 06:58 PM   #242
WalterW is offline WalterW  Netherlands
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Thanks! Will have a look at it.
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Old 9th August 2017, 12:39 PM   #243
WalterW is offline WalterW  Netherlands
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I ordered a pair of Faital Pro 15PR400 woofers, as seen here: OBL-15
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Old 5th September 2017, 12:32 PM   #244
Vix is offline Vix  Yugoslavia
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Hi there!

Its almost 10 years since I built my OB speakers. It all started as Visaton's "No box" project, but I used Eminence Beta 15 as a bass driver. (With Visaton B200 fullrange). Along the years I made modifications in order to improve it. First, I went active, biamping,since I wasn't happy with passive Xo's. Then, I removed side wings, since it sounded more "natural" (less resonances). Then, in 2011, after reading SLOB article, I made two more modifications:
-I just slapped two pieces of chipboard in front of the woofer, creating a kind of "slot" and..
-Modified active crossover, and made it very similar to the one in SLOB aricle. The fullrange was cut at 160 Hz hi-pass, and the woofer at 80 hz low pass + Eq circuit. The basic difference was that the hi-pass was done by using B1 buffer "blocks" while the low-pass was done using opamps, simply because I already had it, so I just slightly modded it.
The result was a satisfying speaker...until now.
What happened? I moved into a smaller apartment, (roughly 4x4 m room, sonically disastrous). Open baffles are next to a wall. It is highly impractical now to pull them out for a listen. At this position, they sound muddy and garbled. I am aware that Open Baffles are not well suited for a smallish room and they don't do their best close to the wall.
Now I am facing a dilemma: should I try modding them again, or abandon the OB concept and go back to boxes?
When I mentioned "modding" I was thinking wether I could get a better sounding "Open Baffle" by mounting the woofer like in a Mini-slob (face-down) firing into a slot (like the one desctibed in this thread)? I mean, how sensitive is the Mini-SLOB to the rear wall placement? Is it less sensitive than an "ordinary" OB?
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Old 5th September 2017, 01:08 PM   #245
Vix is offline Vix  Yugoslavia
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Some pics..just to get the ide. Sorry the front "slot" is not visible since the whole fron is covered...may take a pic when I get home. Will post it later
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Old 5th September 2017, 05:32 PM   #246
Nelson Pass is offline Nelson Pass  United States
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Going back to boxes is viable. I prefer sealed boxes if you have active
electronics to work with. FR might still be in OB.

With a little more work, you should be able to make the existing crossover
do the job.
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Old 5th September 2017, 06:04 PM   #247
Zen Mod is offline Zen Mod  Serbia
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try them baffle-less , squeeze few smallish subs around

I know you have those cheapish toys , to play with
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Old 6th September 2017, 06:49 AM   #248
Vix is offline Vix  Yugoslavia
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Yup, it seems that it is inevitable I am not happy to part with OB's,but a smallish square room is not OB friendly. Before making a decision (to dismantle OB's) I wanted to try a few different approaches in hope that they would work. One of them is Slot loaded OB and perhaps a Ripole. On the other hand, maybe it is a futile effort and just a waste of time and money. That's why I asked if somebody tried Mini-Slob in a smallish room, close to a wall. It seems that few people did that, and even Nelson himself didn't try that since he has a big room...
So..ZM, as you said, I'll have to look for other options, the most promising being the one with multiple (four) subs in order to make that work. I tried with two simple sealed boxes and it doesn't work, there is more bass in the kitchen that at the listening spot (room null)...
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Old 6th September 2017, 07:09 AM   #249
Zen Mod is offline Zen Mod  Serbia
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you now my baffles from pictures - practically in corners

every regular (so baffles properly in space ) sim is showing lack of bass , considering low Qts drivers and smallish (narrow ) baffle

in situ , I can't complain about bass (both quantity and quality) , quite contrary

to remind (both myself and) you - my baffle experiment was sorta conducted upside-down - I didn't started with project on paper - I had baffles so I just screwed what I had of drivers , tried .... then analyzed

so - in your case - only further minimizing of baffle will help , if bass is , as you say , on gigantic and sloppy side

feel lucky that you have Betas , not Alphas
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Last edited by Zen Mod; 6th September 2017 at 07:11 AM.
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Old 6th September 2017, 09:06 AM   #250
nesha is offline nesha  Serbia
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Vix, can you try this arrangement...
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