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sreten 1st July 2011 02:11 PM

Near full range BMR (Balanced Mode Radiator)
Hi All,

Something that night tickle your fancy,

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) :

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.


enigmaticEntity. 4th July 2011 01:45 PM

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...?

digits 4th July 2011 06:25 PM

Good God, I just bought my first router on saturday, now they make triangular speakers!!!!!!!!

kach22i 6th July 2011 12:37 PM

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.

sreten 6th July 2011 01:12 PM

1 Attachment(s)

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

Or do the added masses change all that ?

This smaller driver does :

Also see :

rgds, sreten.

Boden 6th July 2011 02:08 PM

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?



sreten 6th July 2011 02:21 PM


Originally Posted by Boden (
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. '


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

rgds, sreten.

chris661 6th July 2011 03:00 PM

Certainly looks interesting. Any ideas of the price of the wide-band unit?

sreten 6th July 2011 05:57 PM


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

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

rgds, sreten.

theJman 10th July 2011 06:34 PM


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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