Hi Analogluvr,
Since you made mention of using custom enclosures and Tannoy drivers, it gave me license to mention mine, HPD 315's in 150 liter bass-reflex, 1 7/8" thick MDF, cones converted to "Hard Edge", and custom crossovers using copper ribbon inductors, Mundorf SIO caps, and Dueland resistors.
I have used many different amps with these speakers, and have arrived at my holding point, with two completely different types of amps, an SET 300B, which matches beautifully, and Class D Audio CDA 254 amps, of which I am using two in bridged mono configuration, at 500 Watts into 8 Ohms.
The SET hasn't seen much use since I built these Class D's, the Tannoys sound spectacular with that much power (they sound spectacular with the SET 300B too, but with the additional power, there's no contest, as the Class D sounds very much like the SET on steroids).
I encourage you to pursue a project pair of Tannoys. Back when I built mine (ca 2009+-), I found my drivers on Ebay UK for around $700. They have gotten much, much more expensive since then, and will most likely continue to do so.
You should check and see what's available now, and if you're not too discouraged, get started. Done right, a vintage custom pair of Tannoys can give nearly any speaker a run for their money.
Enjoy, and regards,
Dan
