Best Tube Preamp with Biamp Capability


I've received some feedback that biamping using Y-connectors is less than optimal. I'm looking for some suggestions for a tube pre that has biamp XLR capability. Neutrality would be great, but a sweet midrange and solid bass would be second best. Budget: Less than $5k.

The preamp would send signals to four channels of an EAD PowerMaster 2000 which would drive a pair of Revel Studios.

Thanks for you advice!
leftistelf
A used BAT VK-50SE. Very neutral, very dynamic, great bass, all tube, dual XLR output, can be upgraded to VK-51SE.
The Sonic Frontiers Line series pre-amps have 2 outputs per channel to facilitate bi-amping, and the SF pre-amps are known for their neutrality. I can highly recommend the Line 2 and the SE version of it. SF is no longer producing them, but technical support is still there, and they are available used for good prices. Good Luck. Craig