FS - BMS 4552nd Compression Drivers - Brand New (Australia)

[Rialb]

Pair of BMS 4552nd 1" compression drivers. 16ohm.

A$500 including postage Australia wide.
Will ship overseas at additional cost.


Drivers are brand new. Will happily e-mail photos on request. These were for a project which never eventuated. I am selling as I am building a new home.

 

[Rialb]

TTT

 

[flshzug]

sorry , hella expensive, shop is cheaper than that, not to mention I might buy the ferrite sooner and not care about nD.

 

[Rialb]

These are not available in Australia. I had to have these shipped to Australia from a supplier in America.

Taking into acount what I paid for them, International EMS To Australia and then the $US - $AU conversion I am not even recouping what I paid for them.

 

[Rialb]

Price dropped to $450

 

[Eva]

How much would them cost including shipping to Spain?

 

[flshzug]

there are measurements done over JBL forums ( audioheritage ) very nice indeed, extends over 15khz , its the 4550 with nD magnets

 

[Eva]

I would like to see some pictures. Is it a bending ring radiator or a conventional dome?

 

[Rialb]

See the below link for info. Will get shipping info asap.


http://www.bmspro.info/index.php?show=item&usbid=10278&id=54364

 

[Eva]

I already knew BMS website and I had read about their bending ring radiators, but pictures are very hard to find, particularly pictures of its internals. I feel quite curious about that.

 

[Eva]

Are you no longer interested in selling?

 

[-CGL-]

Eva, what kind of pictures would you like ?
I do have some BMS drivers...

 

[Eva]

Oh, thanks. I would like to understand internal layout of the ring diaphragm, rear chamber, compression chamber and the first horn section that goes from the diaphragm to the exit of the motor. It seems that the new BMS ring radiators don't use the same layout as the classic inverted dome compression drivers.

 

[-CGL-]

The patent shows the structure quite nicely.

5,878,148

I´ll take some pictures tomorrow to support the patent.

Edit:

(Found a recone kit)

Here´s a blurry re-cone-kit for 4554 1,4" driver.

 

[Eva]

Thank you very much. I think that patent drawings solved my doubts, I was not sure about wehter the cavity had a 180 degree fold in the beginning or not. The dual diaphragm version got me quite impressed too.

They solved the old problem of lack of repatability in compression chamber size, usually resulting in different response in the top octave and bad stereo imaging by including the chamber in the diaphragm assembly.


Hey Rialb, are you alive?

 

[Rialb]

Hi Eva

Sorry I have had another party here in Australia interested and I'm just qualifying them as a serious buyer before I look at shipping overseas.

I have looked at shipping and It's going to cost approx A$100 plus insurance to send via Airmail to Spain....

Blair

 

[Eva]

No problem. I will wait, anyway I would save little or no money due to the expensive shipping, so if the local buyer is serious go for it. Otherwise I may be still interested.