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Old 29th May 2010, 02:05 PM   #311
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Default NXT ( Shinhint ) 4.5 inch BMR driver

Hi Human bin,

The NXT patended ( made under licence by Shinhint in China ) Bending Mode Radiators ( BMR ) are really good little drivers.
I will post pics ( Telstar again thanks for your shrinking service! ) of the 2 versions, one pure flat "cone " or with the rubber surround internal ie same side of the cone as the spider.
I have made a two driver per cabinet and and a 4 driver per cabinet using these drivers. They can go down to around 70Hz in a very small ( 3 litres per driver) sealed box. I cross them over at 100Hz to subs in a 5.2 home cinema set up and they sound great.
They dont come close to the Manger in a high end speaker ( listen to the £6,000 Naim speaker using an 8 inch version of the driver...) but they are fantastic value compared to a small bass mid plus tweeter set up.

Cheers

Derek.
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Old 29th May 2010, 02:27 PM   #312
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Quote:
Originally Posted by Nelson Bass View Post
My clone of the Emerald Physics CS2:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

WOW !!

Are you replacing the Selenium drivers?

How hard is it to do the EQ ?
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Old 29th May 2010, 02:54 PM   #313
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Wink Baffles and boxes

Quote:
Originally Posted by trusound View Post
so you have came to the same revelation... lol.. boxes and baffles are useless
Hi Trusound,

Yes and no....!
Above 500Hz yes indeed forget baffles and boxes for domestic high end audio.
A naked Manger suspended from a thread... simply beautiful to listen to and to look at.

Below approx 500Hz we have a choice between huge cost i.e. multiple 21 inch drivers, plus multiple 8 inch drivers (plus a multiple 5 inch drivers plus a pair of AMT's above approx, 500 Hz ) huge physical size ( zero WAF needs dedicated room ) and performance. i.e. The ultimate sub 500Hz set ups is Stig Erik’s, it will go lower and louder with low distortion and will sound great.
But its big and expensive. Compare that to my small VPL open baffle ( pictured above ) design which uses one Manger plus two 15 inch drivers per side and is only 850mm tall!
How the sonics would compare is the $64,000 question, maybe one day I will load a pair of my speakers into the back of my car ( easy to move speakers make life easy ) and go visit the Stig for some beer and music time...!

Suffice to say my latest system out-performs my commercial Ovation, Encore and Finale speakers in every way.

The one area where sealed box stills rules by some margin, is in the home cinema arena. A sealed 80 litre box with the attached "Predator " driver in it will convert more electrical energy into low frequency ( sub 20 Hz ) kinetic energy than a room full of baffle - less 21 inch drivers.
Watch this space....!
Attached Images
File Type: jpg Predator II.jpg (199.3 KB, 2600 views)

Last edited by Overkill Audio; 29th May 2010 at 02:55 PM. Reason: missed words
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Old 29th May 2010, 03:01 PM   #314
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Default photo attached

This phot is just a CAD drawing of the chassis.
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File Type: jpg Predator II.jpg (199.3 KB, 2539 views)
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Old 29th May 2010, 04:51 PM   #315
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Quote:
Originally Posted by felixx View Post
....and also very important ....what crossover you use?
Very atractive design.
Thanks.
2xEminence Alpha 15a
1xBMS 4552Nd

I use software based crossover (Foobar mediaplayer plugin named: xover) and ASIO4ALL to handle two USBDACs connected to a apple mac mini running windows xp when playing music.

This way I could avoid the A/D conversion process and use my NONOS TDA1543 based USBDACs. :-)

I also got the coaxial drivers so I can upgrade the CS2 clone to be a CS2.3 clone. But I've no time at the moment so I may sell these clones and use some other speakers in the house.
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Old 29th May 2010, 05:08 PM   #316
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Quote:
Originally Posted by gainphile View Post
WOW !!

Are you replacing the Selenium drivers?

How hard is it to do the EQ ?
Yes, I use the BMS 4552Nd driver instead of the Selenium.

The equalizer within Foobar has only 18 band covering 55Hz to 20 KHz but I find it adequate. I'm not able to measure this setup as Foobar is needed as source with the crossover so I tuned the equalizing by my ears.
I only EQ the lowest bass a few dBs as I already have plenty of bass even that there are 1,75 meter behind the speaker to the wall.

This speaker system is quite impressive compared to nearly any other speaker I've heard. And I've heard a lot (e.g. B&W 800, Infinity IRS Beta, HÝrning Hybrid Eufrodite).

But I don't find the Alpha 15a very good playing up to nearly 1KHz so I bought the Eminence Beta-12CX 12" Coaxial Driver as used in the upgraded CS2.3.

But I've not replaced the waveguide with the 12CX driver yet as I've to build a passive LP crossover for the coax and a passive HP for the compression driver. One of these days...
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Old 29th May 2010, 10:05 PM   #317
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Default BMR pics

Hi Human bin,

Here are a few pics of the little BMR drivers.
If you or any one else is interested I can post details, graphs, and listening impressions a I have spent a lot of time working with them.

Cheers

Derek.
Attached Images
File Type: jpg BMR pics low res.jpg (208.5 KB, 353 views)
File Type: jpg BMR pics low res 2.jpg (168.0 KB, 453 views)
File Type: jpg BMR pics low res 3.jpg (155.5 KB, 429 views)
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Old 30th May 2010, 02:13 AM   #318
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Overkill, a thread in the about the BMR would be very interesting! not sure what section it should belong, let us know if you start one
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Old 1st June 2010, 05:10 PM   #319
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Thought I should publish some pictures of my OB which definitively outperforms the CS look-a-likes. I know because I have been down that road with the Alphas and B&C DE250. These are Alpha15s, 6ND430 and Neo3 (non PDR) without backcup all in dipole mode thus. The baffles looks bad but sound very good in all respects and with all kinds of music. Picture and frequency graph measured in my livingroom tells the rest now:

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/Erling
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Old 14th June 2010, 09:43 AM   #320
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Default Tang Band W8-1808 Open Baffle

Tang Band Open Baffles - Audio & Video Equipment Forums

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