Don't know if tubes are in your playbook, but I have a pair of Spendor SP1/2Es and use an Image Audio 65i amp. It has KT88 outputs (and can also use 6550s) and makes for a perfect match in my book.
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Sounds to me like you're looking for something to give you a bit more fullness at low volume. That's a common thing for apartment-dwellers, who can't (and don't want to) turn up the volume. In my room, I've found that a rear-ported speaker seems to load the room a little better, but that's not going to do you much good, as the Spendors are front-ported, I believe. I might suggest two things - as you seem to like Cambridge, perhaps one of their better integrateds with tone controls. Not the purist way to be sure, but a little bass boost can go a long way. My friend uses Harbeths with a Leben amp and it's bass lift works wonders. The other option, also not exactly purist, is to lower the speaker height, either on a conventional stand, such as the 18" Lovan Jazz, or one of the Mapleshade stands. You can try your speakers on the floor tilted back to see how that works out before investing in stands. The Mapleshade Gibraltar looks really interesting, albeit expensive. Unfortunately, speakers are at the mercy of the room and sometimes it's just pure luck to find a speaker that clicks with the room to give us the sound we want. Good luck.