Ah, the joys of experience.... Hooked the Nightbass up to my Hiwatt only to discover that it sounds generally dreadful when more than two effects are engaged; it renders hopelessly generic the sound of an Alembic bass guitar. Yech! Maybe I can get $200 for it on TalkBass or Ebay.
What I am looking for is a super-clean, wide-bandwidth hi-fi sound; why else does one play an Alembic? One can always dirty things up a bit with a tube preamp or a tube stomp-box overdriver when a bit of SVT burr or more radical grunge is necessary. I do all of my tone adjustments with my bass' filters. EQ is generally not a big thing for me. An optional little of that tube enhancement is all I desire.
Fortunately, I found that my long-forgotten-about (and one owner, bought new by me in 1974) Maestro Bass Brassmaster, still works like a charm. All original, and if anyone is interested in a weird, ridiculously rare, vintage fuzz/octaver, please PM me.
Think that I will opt for a G-K Fusion 550 and it's companion 2x12 plus tweeter Neo cab and an EBS Uni-Chorus (the only effect I use fairly often). I LOVE 12s for bass and used 2 6x12 Orange cabinets with a 1974 Hiwatt 100 DR103, Maestro Full Range Booster, the Brassmaster and a Morley Power/Leslie Wah back in the glory days of 1975. That rig could blow windows out of their frames and out-loud my then-band's Phase Linear-powered PA!
10s are too wimpy and just don't go low unless there are at least eight of them, IMO, and 15s are too massive to render the appropriately silvery, piano-like shimmer that Alembic electronics should deliver on top.
But if I could find a nice used F-1X and a well-cared for switching supply QSC power amp I could be wooed away from the G-K head.
Decisions, decisions.