What interconnects are you guys using for bi-wiring speakers? I need a Y XLR based cable.

OP... What PreAmp are you going to be using in this setup? Does it have X 2 sets of XLR Outputs, each with plenty of voltage so you can feed a proper signal to each of the Amp Inputs?

If you don't have X 2 pairs of XLR Outputs on the Pre I wouldn't attempt this arrangement as the use of splitters are a true hack job IMO.

I ran a similar arrangement in the past with X 4 Monoblcks and a pair of B&W 803 D2's using a Classe CP-800 Pre with good success.

This PreAmp has multiple XLR Outputs and a total of 18v on tap at the Outputs to drive multiple Amps correctly.

@auxinput

Yes the CP800 is a pretty unique beast and it took me quite a long time to find such a beast that can do what it does. I still use it today strictly as a PreAmp and get no sense of it being a weak point in my system despite it actually being the least expensive component in my whole rig. Heh, my speaker wire has a higher price tag :)

@mgould

Please share the model Krells you are thinking of using in this setup. I'm inclined to think there must be at least two, 2 X channel amps at your disposal of the same exact type and similar age...etc?

The good news is that IME, the B&W D2 and I suspect the D3 have a pretty high power handling capability so that shouldn't be an issue unless you go full crazy mode. I was pushing my "Upper Section" with a Mono amp capable of 575w into 2ohms and the " Lower Section" was pushed with a matching separate amp of the same capability and the speakers never even blinked. My neighbors would have been knocking before the speaker even showed signs of braking a sweat. My balls ran out usually in the 112db range at seated position.

Anyway, based on what I'm hearing regarding the PreAmp at play you may be better served by Bi-Wiring until a more suitable Pre can be obtained. No offense meant by my statement :)