Let a conventional-looking speaker reproduce both Common and Differential Mode by adding – or separately amplifying – a second mid-driver, with the Differential Mode phase-split across the pair. The most consumer-scalable form of the principle: no exotic enclosure required.
The chain, crystallized for the living room
The distinctive move is a spectral-interlacing crossover that lets two closely spaced drivers carry opposite-phase Differential Mode without cancelling in the air. Because the input is any stereo or multichannel signal and the drivers are conventional, it can be licensed to OEMs as a DSP block plus a design rule.
A midrange/woofer pair spaced 15–30 cm, optionally with a tweeter between them carrying Common Mode only.
A base DM signal from the channel difference is split into +90° / −90° versions; each driver gets Common Mode plus one phase – which is why each needs its own amplifier channel.
Complementary interleaved bandpass combs keep the two phase-shifted DM signals from cancelling at low frequencies; DM is omitted in the treble where it adds nothing.
A granted, long-dated transducer adds Differential Mode emission to an otherwise conventional loudspeaker.
The functions behind this market