UPDATE----I've been using a very simple Kingrex preamp for about a yr now. I run the upper bass, mids, and tweeters directly from the source into the amp and send the bass through the Kingrex preamp then to the amp. This allows me to tailor the bass output with minimal editorialization. The Kingrex is quite transparent and doesn't lessen dynamics. And it was cheap! For $200 shipped, I found a very good fix for my situation.
need good minimalist preamp or headphone amp to actively drive woofers in a biamp setup
I'm biamping a pair of custom speakers, kinda like a Legacy Focus clone using mostly Eton drivers. I'm going directly from the source, either a Consonance Droplet 5.0 or a Raysonic 228, into a four channel Jaton amplifier. The woofers are a little less efficient that the other drivers so the bass, from a quad of Peerless 1259 woofers, is not what one would expect or desire. In the past, I've used either big integrated amps to drive the woofers or pro amps to good effect but I really like the bass from the Jaton amps. So, I would like to add a minimalist preamp between the cdp and the amp driving the woofers. I tried a Parasound ZPre II and it did the job but obliterated fine details so I need something more revealing. I'm considering the Morrison Elad but would like to hear other options. I'd even consider a good headphone amp though I have absolutely no experience with them and I don't want to run the bass through another DAC as I really like the sound from either of my current cd players. I'd like to spend around $500 or so for this project, no more than $1000 please on the used market. Many thanks for helpful recommendations!