McSpeaker- Martin C geddit?

BNC- BMR and Cone

Then if the bass driver keeps growing, the Dominator, Terminator, Dreadnought and all the other macho style names.

LSD sounds good to me. ACID- all cone integrated drivers?

Its not really flowing at the moment, the Mat(t)s are doing better at the moment.

That name is setting the bar high. We will need Kan and SBL owners to get reading for a rhythm sound clash!!

http://en.wikipedia.org/wiki/Rhythm_King

For a slice of dance music just before Acid House broke, Beat Dis, S-Express etc.

With respect Marcus

too many cooks !


I have auditioned the driver and I consider the merits outweigh the demerits.

The operating theory is fascinating where the output is not that from each mode as it progresses up the range but the sum of all the modes including the first or pistonic mode.

The time coherent output from piston range up is special, the Manger driver has it too at massive cost, and has some distortion too; when I last measured it pretty constant over the range , while the residual BMR distortion is narrow band and infrequently voiced. I have tried to subjectively identify it as a specific feature and so far I cannot.



It can sound nearer to a wide range ribbon or electrostatic

Note that there are several iterations of the BMR with detail build differences, and differences in resulting performance.


Kind regards

MartinC

Has a decision been made about what type of bass unit and crossover will be used?

Sounds good should offer bass in room to 35hz or a bit below that

Edited by user 20 December 2010 14:53:00(UTC)  | Reason: Not specified

could be nearer 8ohm, the bass is 8 and while the BMR is lower , by the time it is integrated in the system it could well reach 7-8 ohm overall .


MartinC

While it is not the same make of driver Naim provide this White Paper to illuminate the subject.

http://www.music-line.bi...in/pdf/wp_ovator_bmr.pdf

MartinC

Manger uses a relatively soft diaphragm with substantial viscoelastic damping.

BMR uses a reinforced honeycomb cored plate where the expression of the few bending modes present is controlled using dynamic balancing.

If perfectly made the axial response remains flat even though bending modes , ie resonances, exist.

Manger and BMR do have good time responses in common, ie they are linear phase.
They both have that special quality of a near full range driver.

MartinC

Phase 1 approach and technical design will be in the jan -march issue

MartinC

Just got my issue 4/4 *ahem- a bit late renewing the subscription* and I have read the BMR article. Rereading this thread and it all makes a lot more sense. The magazine article makes note of the importance of the cabinet construction, I have found that tweeters etc often sound better when taken out of the main woofer cabinet- then I note from this thread Martin mentions there is a mid/treble part to the enclosure. This could be crucial and so it will be interesting to see what Wilmslow offer. Seeing what they do for the Fostex drivers I am feeling positive.

"The Labyrinth cabinets are supplied in four different options as shown below, all are fully CNC machined and rebated from 22mm MDF.

Flat-pack option:

Cabinets supplied as a self-assembly flat-pack in either plain mdf or pre-veneered mdf of your choice. Both options are fully machined and rebated which means that the components all slot together very easily, just needing to be glued with the 'Evo-stik Resin W' wood adhesive that is provided.

All the neccessary holes and rebates for the drive units are pre-machined so you can assemble the cabinets without having any wood-work skills."

There might be an issue with the finish of the cabinets. As cabinets are often voiced with veneer on the MDF shell we are limited to the what Wilmslow supplies. Yes they have a reasonable range but I havent seen the veneers in the flesh/wood. Could a bit of Sonus Faber come in here and leather be an option for the front panel? Colour to suit your decor and taste?

It would be nice to try to avoid any compensation components in the crossover outside the actual crossover itself. I feel it would be best to use the full range nature of the BMR and avoid anything unnecessary in the way of the signal. But again Martin mentions an interesting crossover, so do we expect to see some magic capacitors???

Finally, it looks like this could be one of the first speakers to market with the BMR and so I am sure CSS will want it to add to their reputation. Martin at the controls, apart from us lot let loose with drills and hammers- what could go wrong?