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Old 17th July 2017, 12:39 PM   #41
Frank40 is offline Frank40  Denmark
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I have been experimenting with this unit for some years now. As mentioned, it is designed for open baffles.
But I find that it can be used in other configurations as well, depending what you want and need. When used in a small closed box, it does have a small peak at low frequency’s. But if this is taken in consideration and placed far from the back wall, it doses preform pretty well.
I have tried a larger box with stuffing, but with no back plate (open in the back), that is even greater. So, the idea about using an aperiodic design, sounds like a good idea.
Another design I have tried is an open baffle using two units. The unit no. two is cross over at the frequency where the baffle starts to influence the respond. This works amazing, the respond is almost one oct lower, when using a proper second unit.
I have posted some pictures for inspiration.
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File Type: jpg IMG_0187.JPG (82.8 KB, 884 views)
File Type: jpg Capture_840.jpg (585.6 KB, 882 views)
File Type: jpg Sal1.jpg (99.4 KB, 880 views)
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Old 17th July 2017, 11:53 PM   #42
Nelson Pass is offline Nelson Pass  United States
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Nice to see what you're using Frank, and so neat too.

Here's my listening room a couple days ago.



I have a solution for that peak in sealed boxes, which is a nice negative
output impedance on the amplifiers. A DF of -5 or so just about does it...
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Old 18th July 2017, 12:22 AM   #43
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by planet10 View Post
This cross-section of the PR200 (an advanced aperiodic box) gives some ideas on this approach.
remarkably similar to the BOFFLE isn't it.
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Old 18th July 2017, 12:45 AM   #44
planet10 is offline planet10  Canada
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In ways yes. You could call a Boffle an early aperiodic box.

dave
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Old 18th July 2017, 04:39 PM   #45
Nelson Pass is offline Nelson Pass  United States
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Forgot the photo.....
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Old 18th July 2017, 05:03 PM   #46
Michael Rothacher is offline Michael Rothacher  United States
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Looking good, sir. Love that room

Baffles look great and I like the black line-level chassis.

The Xenomorph is cool too.
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Old 18th July 2017, 05:21 PM   #47
Zen Mod is offline Zen Mod  Serbia
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Open Baffles are for Sissies

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Old 18th July 2017, 08:55 PM   #48
Michael Rothacher is offline Michael Rothacher  United States
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Quote:
Originally Posted by Zen Mod View Post
Open Baffles are for Sissies

Is that a BAFF-O-MET?
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Old 21st July 2017, 08:10 PM   #49
Variac is offline Variac  Costa Rica
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Frank,

Welcome to your thread. Very nice to have you around, and those experiments you've done look quite interesting...
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Old 22nd July 2017, 03:50 PM   #50
mbrennwa is offline mbrennwa  Switzerland
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Does anyone have a free-air impedance curve of the SAL driver? (Not just the bass peaks in the Nelon Pass Youtube video...) A figure covering DC to daylight would be nice, and raw data would be even nicer.
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