Bryston options

The new Bryston Cubed series amplifiers are a significant improvement over the older models. I have met a few people who prefer the older models over the Cubed series, but it's rare. So I'd certainly give that option some consideration. With the Martin Logan Vantages, you'd want at least the 4B3 for sufficient drive capability, but you'd probably even benefit from going with a 14B3 considering the Vantages low impedance at some frequencies.

Otherwise in general I think the load demand from the Vantages is going to be your biggest issue in terms of amplifier compatibility.

@grahamsphillips we have the Lumin AMP here, by default paired with the Lumin X1. I'm afraid I don't have a good idea of how well it will drive the Martin Logan Vantages which is a relatively difficult load.

The sound quality is very good but you need to be aware of the sound character Lumin has chosen to present. It is also much more expensive than a similarly powered Bryston amplifier.