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!