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
Summary of Contents for OVATOR S-400
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