Anyone tried active biamping with Martin Logans?

I haven't got 'em set up yet, so I don't know if this'll be a bright combo. I'll find out in a day or two and report back. I'll start with passive biamping, but I can't help but wonder if active biamping would yield even faster, tighter bass.

What affordable tube amp would you recommend for the MLs? It has to be able to drive the Aerius' minimum 1.7 Ohm impedance, and it's my (relatively uninformed) impression that most tube amps don't handle low-impedance loads well. I don't, however, need a lot of power, as I live in an apartment. One of the strengths of the Adcoms, aside from their generally good performance and the fabulously low price I paid for them on eBay, is their ability to pump a lot of power into low-impedance loads.

In his review of the Aerius i for Stereophile, Sam Tellig wrote:

"Keep in mind that a 60Wpc tube amp will probably put about the same 60Wpc into 4 ohms that it does into 8 ohms—but the 60Wpc Bryston solid-state integrated is said to put out 100Wpc into 4 ohms. This is likely the reason why the Bryston B-60 could drive the Aerius i's with a reasonable sense of ease and why the tubed Conrad-Johnson MV55 could not."

I'm wondering if this is really relevant, as I've heard that ML has successfully driven their speakers with a pair of 20-Watt Quicksilvers.

Any info would be appreciated by this tube-ignorant beer-budget music lover.

Well, I paid $1,350 total for the Aeriuses, two Adcom GFA-5200s, and an Adcom GFP-555. Next thing to get upgraded is probably my Harman/Kardon CD changer - I'm thinking a used Rega Planet might be a good, affordable move. Possibly Straightwire - braided (low impedance) for the woofers and coaxial (low inductance & capacitance) for the panels if I go the active biamp route.

Still, I'm interested in learning about tube amps in case more change turns up in my sofa cushions.

"All of these amps deliver a lot of current (as opposed to the voltage of the SS amps)."

I thought SS amps generally could deliver more current into low impedances than tubes (e.g. 50W @ 8 Ohms -> 80W @ 4 Ohms). No? The Adcoms are reportedly good at this.