What Amp/Pre with Spendor S8es.

I didn't get too many responses on the loudspeaker forum so I thought I'd try here. I'm curious to know what amp combos people are using to drive their Spendors. I love the speakers but I don't think I'm getting the most out of them with my current Rotel gear. Looking to add some depth which the Rotel simply doesn't have. Front ends are a TT w/a Project Tube Box and a Cambridge 850C CDP.

Always contemplating the next upgrade and I've done everything else, so amps are next.