Near-wall design

David Gatti · 16th February 2009, 04:14 AM

I've been playing around with ideas for a shallow type of speaker cabinet, a bit like the old Boston Acoustics A150, designed to sit right up against the wall.
The pic below shows the idea I have in mind, with 45 degree chamfers from the front baffle to the wall. Depth would be about 200mm (8 inches).

I'm not sure what kind of diffraction signature this will create, and whether it will mitigate the reflections off the wall.
Does anybody have a comment or opinion on this?

planet10 · 16th February 2009, 04:43 AM

I've actually built a speaker like that...

dave

David Gatti · 16th February 2009, 05:18 AM

Care to give details? What was your impression of them?

planet10 · 16th February 2009, 05:40 AM

Quote:

Originally posted by David Gatti
Care to give details? What was your impression of them?

It was supposed to be an isobarik B110/T27 MTM... never finished them. The shape is a very good idea... at least i thot so

dave

David Gatti · 17th February 2009, 01:17 AM

Here's a more practical version.

planet10 · 17th February 2009, 01:49 AM

What kind of drivers were you thinking of?

dave

David Gatti · 17th February 2009, 02:21 AM

At this stage -:

Tweeter - Scanspeak illuminator D3004/6620-01
Link

Midrange - Audiotechnology C-quenze 15h5206sdk
Link

Woofer - Audiotechnology Flex 12" custom design with 4" voicecoil
Similar to this

or a Dynaudio MW190
Link

Crossovers around 200 Hz and 3.5kHz.

56oval · 17th February 2009, 04:51 AM

Hi Dave

our cabinet is similar to what I'm going to build .Mine will be on small stands with the bass drivers in seperate cabs .

I'm going to try a 70 degree angle .
Cheers

planet10 · 17th February 2009, 05:29 AM

Quote:

Originally posted by David Gatti
Scanspeak, Audiotechnology, Audiotechnology, Dynaudio

Full-on Danish system... gonna get Jensen caps & coils?

dave

David Gatti · 17th February 2009, 07:15 AM

Nice to see 56oval. What's the dimensions & drivers you're using?
Why did you choose 70 degrees? A lower angle would help with diffraction.

Planet10, I don't know if I'll have any cash left, but Jenzens would be nice. Maybe just on the tweeter.

16th February 2009, 04:14 AM	#1
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Near-wall design I've been playing around with ideas for a shallow type of speaker cabinet, a bit like the old Boston Acoustics A150, designed to sit right up against the wall. The pic below shows the idea I have in mind, with 45 degree chamfers from the front baffle to the wall. Depth would be about 200mm (8 inches). I'm not sure what kind of diffraction signature this will create, and whether it will mitigate the reflections off the wall. Does anybody have a comment or opinion on this?

16th February 2009, 04:43 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I've actually built a speaker like that... dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

17th February 2009, 01:49 AM	#6
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	What kind of drivers were you thinking of? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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16th February 2009, 05:18 AM	#3
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Care to give details? What was your impression of them?

17th February 2009, 01:17 AM	#5
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Here's a more practical version.

17th February 2009, 02:21 AM	#7
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	At this stage -: Tweeter - Scanspeak illuminator D3004/6620-01 Link Midrange - Audiotechnology C-quenze 15h5206sdk Link Woofer - Audiotechnology Flex 12" custom design with 4" voicecoil Similar to this or a Dynaudio MW190 Link Crossovers around 200 Hz and 3.5kHz.

17th February 2009, 04:51 AM	#8
56oval diyAudio Member Join Date: Jun 2006	Hi Dave our cabinet is similar to what I'm going to build .Mine will be on small stands with the bass drivers in seperate cabs . I'm going to try a 70 degree angle . Cheers

17th February 2009, 07:15 AM	#10
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Nice to see 56oval. What's the dimensions & drivers you're using? Why did you choose 70 degrees? A lower angle would help with diffraction. Planet10, I don't know if I'll have any cash left, but Jenzens would be nice. Maybe just on the tweeter.

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