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BMR Isolating Enclosure

BMR Suspension

BMR Driver

The Ovator Balanced Mode Radiator (BMR) is the result of many years of intense effort in 
both development and manufacture. Not only does the design of such a driver demand great 
intellectual understanding, but consistent manufacture requires extraordinarily fine specification 
and control of the physical characteristics of its components. The underlying concept of the 
BMR is to engineer a practical implementation of the theoretically wide bandwidth and linear 
acoustic output of an unconstrained vibrating diaphragm. In practice, this is achieved by 
attaching balancing masses to a constrained diaphragm in carefully calculated locations.

 

Such “mode balancing” modifies the diaphragm’s vibrational behaviour so that it 
simultaneously operates in pistonic and vibrational modes to generate wide-bandwidth 
acoustic output with a flat frequency response, consistent dispersion and low distortion. 
Thanks both to the BMR’s exceptional inherent performance and to the absence of any

 

mid/high frequency crossover discontinuity, it takes just a moment’s listening to appreciate

 

the Ovator breakthrough levels of musical coherence, timing and clarity.

The BMR units in both the 

S-600 and S-400 are isolated in 

their own nested enclosures, a 

12.7mm wall thickness extruded 

aluminium tube in the case of 

a the S-600 and a 10mm wall 

thickness composite tube in 

the case of the S-400. Both the 

S-600 and S-400 BMR isolation 

tubes extend the full depth of 

the enclosure and are gradient 

filled with damping materials 

selected through technical 

analysis and critical listening.

The S-600 BMR module, 

comprising the driver and its 

enclosure, is suspended within 

the main enclosure by circular 

front and rear duralumin leaf-

springs, while the S-400 BMR 

itself incorporates a high-Q 

elastomeric suspension 

system The resulting isolation 

in both systems decouples 

at a frequency many octaves 

below the BMR pass-band.

The S-600 and S-400 

BMR drivers comprise a 

honeycomb diaphragm 

driven by a voice-coil 

immersed in a twin 

neodymium magnet system 

optimised for linearity 

through finite element 

analysis. The pressure 

die-cast chassis provides 

the rigidity necessary to 

ensure that every last note 

of musical detail is

 

accurately reproduced.

Balanced Mode Radiator explained

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