I heartily recommend the Spectron Musician III Mk.2!
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My speakers are power hungry WATT/Puppy 8 and I owned McIntosh 2110 tube amplifier. When I decided to upgarde my amp I checked many, many amps and finally I selected Musician III Mk2 - first stereo and now monoblocks with all upgardes and immensely happy with my choice!!!
Classe CA-400 is good solid amp but its not even in the same class as Spectron. I can't remember all details but one think I remember very clearly - as compared to Spectron, there is a VEIL between you and music.
I am not sure if word "lush" fit to Spectron but its sound is sweet and musically involving.
I own the Herron M-150s. I have never heard the Spectron Musician III MK2 or Classe CA-400, but, like you, I am intrigued by the Spectrons.
Here's another thought for handling your power hungry woofers: bi-amp the Herrons, if your speakers have the necessary binding posts. A reviewer for one of the audio ezines went this route and told me that another reviewer he knows of did the same thing. It would be cheaper than the fully upgraded Spectrons, because used M-150s can be had for $2,000 - $3,000 a pair. I would have done this myself, except my speakers have an almost unworkable set of binding posts that are a PITA for just one pair of speaker cables.
The Herrons have been known for a lack of lower end umph from the beginning. I remember reading suggestions to supplement Herron amplified systems with a subwoofer.
I had excellent bass from my M150s powering my Alon Vs. Probably a more benign LF load than your speakers.
I liked the Spectron Musician II amp I tried but I personally much preferred the sound of the Herron amps. I didn't try keith's newer amps, the M1s on my rig.
There is definitely a synergy with Herron pre and amps. If you like your M150s in all other erspects, I would try to bi-amp.
I'd also try to get the newest Herron pre if you can.
Thanks for the feedback everyone. I did eventually pick up a non-upgraded Musician 3 Mk II but it was not my cuppa'. As I posted in the Herron preamp thread, there is some serious synergy between my Herron pre and the M-150's, so the Herron monoblocks aren't going anywhere. I may end up bi-amping. I also have a likely buyer for the Spectron lined up.
As far as upgrading my preamp to the 3A, some day when the money gods are willing...
Have both Spectron and Classe CA400 before, Classe is veil like Michael said and you can tell right away it's a solid state trying to be tube by sounding overly smooth and veil. In another word, failure attempt to mimic tube, at least that's what I heard in my system.
Spectron on the other hand is very good. it's not tube, but it has pristine and very transparent top end.