Near full range BMR (Balanced Mode Radiator) - diyAudio
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Old 1st July 2011, 02:11 PM   #1
sreten is offline sreten  United Kingdom
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Default Near full range BMR (Balanced Mode Radiator)

Hi All,

Something that night tickle your fancy,

Click the image to open in full size.

In the next few months a very interesting driver will
become available from Wilmslow Audio in the UK.

Its a near full range BMR (Balanced Mode Radiator) :

http://www.music-line.biz/cms/filead...ovator_bmr.pdf

http://www.hificritic.com/forum/defa...?g=posts&t=469

Midband efficiency is not high, making bass driver choice and bass
loading type very interesting, there are lots of workable possibilities.

2x12" open baffle could be quite interesting.

Myself, I'm currently planning on building the TRK design.

/Sreten.
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Last edited by sreten; 1st July 2011 at 02:14 PM.
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Old 4th July 2011, 01:45 PM   #2
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It will be interesting to see how this turns out, it seems like an interesting variation of the "flat cone" drivers out there. I'm guessing that not letting it produce bass frequencies might be more beneficial at this stage while the technology is relatively new. They forgot to put damping material between the disk and the pole-piece, inside the voice coil area ;-)

Their bass driver doesn't seem radically different aside from the "de-modulation rings", which seem to replace copper rings in other woofers...?
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Old 4th July 2011, 06:25 PM   #3
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Good God, I just bought my first router on saturday, now they make triangular speakers!!!!!!!!
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Old 6th July 2011, 12:37 PM   #4
kach22i is offline kach22i  United States
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I went to save a copy of the PDF and my computer told me that a copy already existed. This means that I've must have seen this driver before, but just don't remember it.

An interesting unit, I'm a little surprised that the voice coil is not larger and or extends to the outer rim.
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Old 6th July 2011, 01:12 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

It does not appear to be driven at the 1st nodal point does it ?

Or do the added masses change all that ?

Click the image to open in full size.

This smaller driver does : http://www.cambridgeaudio.com/assets...hite_Paper.pdf

Also see : http://www.parts-express.com/pe/show...number=297-210

rgds, sreten.
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File Type: jpg BMR.jpg (21.5 KB, 2807 views)
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Last edited by sreten; 6th July 2011 at 01:16 PM.
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Old 6th July 2011, 02:08 PM   #6
Boden is offline Boden  Netherlands
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Nice pictures. I notice a shade of the so called Dr. Carl Pinfold driver, a balsa flatcone diy contraption described 'first in Wireless World and later in Speaker Builder around 1986. '

Doesnt Infinity also do flatcone BMR drivers?

Regards,

Eelco
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Old 6th July 2011, 02:21 PM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Boden View Post
I notice a shade of the so called Dr. Carl Pinfold driver, a balsa flatcone diy contraption
described 'first in Wireless World and later in Speaker Builder around 1986. '
Eelco
Hi,

I remember that but it wasn't a BMR, intended to be pistonic.

Looked a bit like : (but will a full length magnet and voice coil)

This is a HARP (High Aspect Ratio Panel) BMR

Click the image to open in full size.

rgds, sreten.
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Old 6th July 2011, 03:00 PM   #8
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Certainly looks interesting. Any ideas of the price of the wide-band unit?
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Old 6th July 2011, 05:57 PM   #9
sreten is offline sreten  United Kingdom
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Hi,

Sadly, being supplied by Wilmslow Audio its not going to be cheap.

http://www.hificritic.com/forum/defa...?g=posts&t=469

Some costing speculation in the above link, but knowing
W.A. IMO it could turn out quite a bit more than expected.

rgds, sreten.
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Old 10th July 2011, 06:34 PM   #10
theJman is offline theJman  United States
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sreten;

Is that picture of the new driver from HiWave? I know they have a few BMR drivers out now (HiWave: sensation innovation), but they're going to release some new models shortly. I believe those will include 3.5" and 6" round, as well as 2 oval ones that look virtually identical to what you posted.

I have a preliminary PDF of them, but it's too big for an attachment. If anyone is interested PM me and I'll send it to you.
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