It's actually amazing the number of companies that make these. For example, Accuphase, Bryston, Krell, Pass (old and new, i.e the PCXe and the XVR1), Luxman, and last but CERTAINLY not least, the ACS-1 from our buddy John Curl.
I've owned the Marchand products and I think they're decent.
There's also the concept of a PLLXO (passive line level crossover), which you might consider researching a bit and Marchand sells as well.