Jadem6...bi-amping with SET and the Plinius would allow you to enjoy the benefits of single-ended midrange/highs for all music instead of just small scale acoustic and vocals. Rock and classical would still be just as dynamic and powerful with the added benfit of greater space, air, and tonality.
I run a very similar setup with my Cain & Cain I-Bens being sriven by the DRD 300B's or the Art Audio PX-25 that I own and my dual passives subwoofers being powered by an IcePower 500ASP module or 250wpc Hafler DH-500 SS amp. Due the lone 6.5" single-driver (super tweeter >12kHz), the six foot I-Bens provide extremely tuneful, but not powerful bass. Their stated frequency response is 45Hz-36kHz w/ super tweeter, but in my room the lower rolloff point is closer to the >70Hz range. My dual subwoofers do the dirty work from ~80Hz don.
That seems to be somewhat identical to your Dunlavys in a bi-amping situation. In Robert Deutsch's
1999 Stereophile review(1/2 down page) of your speakers, they set the biamping crossover point at 70Hz:
"The biwiring terminals allowed me to investigate the crossover between the twin woofers and midrange units. Set at 70Hz, with the expected first-order slopes, it allows the woofers basically to act as subwoofers."
I thik that setup will blow your mind on all types of music. It could end up being a near perfect situation. And while I know your Kubala Sun cables are some of the best currently available, in this situation you could easily get by with less expensive cables on the woofers and Plinius. At elast for tsting purposes and the short term.
"I may contact you off thread if I decide I could afford your amp."
Ooops, I hope I didn't give ou the impression that my amps were for sale - they're not.
But, there is a set for sale here on Audiogon right now for
$1,100 with some important upgrades that mine do not have. The amps don't come with 300B output tubes, so would to buy some TJ Meshplate 300Bs for ~$275.
Feel free to send my an email via Audiogon if you have anymore questions.