It appears that JBL has applied DC biasing to crossovers in high end consumer speakers sold in Japan. I tried to find a technical paper on the subject but could only find the usual recycled hearsay or revellations regarding yet another great leap forward posted on various forums.

Is there a serious look at this subject available?

Cheers, Marshall.

p.s. whilst Googling this topic I came across a convert who also DC biases audio cables in order to "stabilise the dielectric".