Can’t help much on this one. The idea of the ‘T-amp’ sounded good but I suspect that they got overtaken by quality improvements by the big suppliers and conventional class-D amplifiers.
We use very ordinary amplifiers in the Orbitsound soundbars….TDA8932 which are inexpensive but handle quite high rail voltages. The weak link is always the loudspeaker driver.
For experiments with current mode, I used LM3886 which is a rugged class A/B amplifier that is relatively easy to convert to current mode.