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QC55 : the four-way coaxial unit

The design of the lens, holding the TC23 in front of

the 22" woofer on the same axis to form a four-way

point source, required very long theoretical and

experimental studies including tests of several versions

and numerous filter modules. The shape succeeds in

creating a portion of pulsating sphere with minimum

diffraction effects. The shape of the arms and of the

front panel of the lens contributes to the quality of the

high and mid frequencies, whereas the shape and the

damping of its rear side have been designed for the

low-midrange specifications.

HIGH

L. MEDIUM

H. MEDIUM

BASS

A spherical enclosure

The spherical shape of the cabinet loading the woofer presents numerous advantages:

- rigidity inherent to the shape.

This is essential to avoid any low frequency vibration that might create noises or a fuzzy sound scene. Thanks to the resulting

extremely good pressure resistance, the shape allows use of a very small volume for a 22" woofer and thus provides 96 dB efficiency

and a linear response down to 20 Hz, in anechoic room conditions. Any other reference system specifying equivalent characteristics

in the low frequency range needs a minimum of four to six times more volume for the woofer(s).

- no standing waves.

There are no parallel surfaces, so it is not necessary to fill the enclosure with a lot of damping material and internal bracing. The use of

those items reduces the internal volume of air available to load the driver, thus requires the use of a larger volume, thus lager panels

that require more bracing and damping...

- perfect symmetry in every direction and no diffraction effects from 20 to 20,000 Hz:

The very essence of the spatial coherency.

There was a hitch when considering a full range spherical loudspeaker enclosure. A problem that required a long term collaboration

with a French designer, famous for his variations around spheres and circles, to answer the following question "which type of stand

will be able to position the tweeter from La Sphère at the optimal height, ensure a no compromise stability of the system even at very

high low frequency sound levels and will not create diffractions spoiling the response coherency out of axis?"