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Old 29th May 2014, 03:19 PM   #1
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Default Solid Wood Full range, Assisted Concept

Here is my current first concept for a speaker using a BMR 4.5" Neo Full range driver, 200Hz +

And a 10" driver as woofer. I currently have these running in simple MDF cabinets, but am looking to make a showpiece and something really special.

Birch plywood CNC cut frame. The rest solid wood. Currently thinking of making it in facets with a Birds Mouth router cutter, and planing into a smooth shape, inside would stay faceted, with no parallel faces.

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Last edited by Studio Au; 29th May 2014 at 03:28 PM.
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Old 29th May 2014, 05:08 PM   #2
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For 200 Hz XO, you wnat driver centre-to-centre to be maximum 17"

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Old 29th May 2014, 05:11 PM   #3
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Without making the thing monolithic, how best to address the centre to centre spacing?

Smaller driver close, wider cabinet (if kept its tapered shape would end up huge) side firing? Lower XO?
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Old 29th May 2014, 05:15 PM   #4
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All of those would push towards the C-C goal.

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Old 29th May 2014, 06:29 PM   #5
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Default centre to centre spacing options

Hi Louis,

Try using two ( or 3!) 8 inch drivers positioned vertically, they will work better aesthetically and sonically....
Cheers
Derek.
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Old 29th May 2014, 09:42 PM   #6
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This was the 'inspiration' for the bass cabinet, toe in full range idea...

Click the image to open in full size.

If using active XO, wonder how it would work having a few BMR's running down the length, with a 10" for 100Hz and under? Say with 3 in the bass cabinet with different cabinet volumes and crossovers at 200 - 300 - and the one on top running from 500Hz+. In essence a mini Line array with sub.

Reluctant to stick an extra 8" Mid in along with the 10", but perhaps a 8" covering the low end. Keen to try the Geddes/Swarm approach with multiple subs, so a good 8" driver should cover the last few octaves with a few subs covering 80-100Hz and down?

Aesthetics are defiantly important, especially with concept designs...
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Old 29th May 2014, 10:29 PM   #7
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Default R&D....

The BMR's break all the rules so you cant sim them effectively and all the old timers on the DIY sites who have had "over 50 years building speakers....!" will tell you the don't work....Ignore those guys!

The only way to be sure how it will sound is to build it....!
The attached crossed over between 200Hz and 400Hz.
Try sketching a curved vertical stack cabinet based on my old Encore bass design, but make it slimmer... approx. 230mm flat front curving out to approx. 345mm at the widest, then tapering back to flat rear approx. 100mm wide. Total depth can be varied to suit internal volume requirements of whatever drivers you use.
I would not advise putting in any extra crossovers above 200 Hz...The reason'dtre of the BMR is crossover free....!!
Cheers
Derek.
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Old 29th May 2014, 10:46 PM   #8
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Default oops, forgot pic!

Here is a pic...
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File Type: jpg 2006_0507Image0048.jpg (657.3 KB, 106 views)
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Old 29th May 2014, 10:50 PM   #9
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Default solid wood housing for BMR

With your cabinet skills you could make a cool solid wood housing for the BMR....A custom sorbothane pad is the best way to enable correct driver positioning with secure mounting, totally vibration free and cool asthetics.
I think three 8 inch bass drivers below it will be great!
Cheers
D.
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Old 29th May 2014, 11:10 PM   #10
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I see none of these.

GM
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