Carver 275 Crimson tube amp --- any feedback appreciated

Correct. Tube amps primarily work best with speakers that have a higher sensitivity - in addition to a flat impedance curve. Many speakers have dips and spikes in the impedance curve at various frequencies that are not mentioned in the specs. The marketing material may just say that the speakers are a ’nominal’ 6 ohm impedance. But, that could be a median average. It could be misleading when trying to match an amp with speakers on paper vs auditioning.

@angelgz2   The best place for your amp question would be at the Martin Logan owners forum. Even with their feedback, I still would recommend auditioning before purchasing.

When I had e-stats years ago, I drove them with a 300w/ch SS amp - that double-downed. The speakers sounded pretty good - even with a dip down to 2ohms. I wanted to try tubes - so I purchased a pricey pair of triode push/pull monoblocks. With these monoblocks, the e-stats sounded slightly worse than coming from an empty Campbell’s soup can. I tried a pair of Speltz Autoformers, no improvement.

At an audio show, I visited a room by Roger Sanders Sound Systems. His 10e e-stats were driven by his Magtech amps with room correction. The sound was absolutely stunning. Far better than any other e-stat (and many other speakers) that I’ve heard. But, having owned e-stats in the past, the extremely narrow sweet spot was a deal-breaker. If you leave the listening chair, they just don’t sound good off-axis.