Gemini,
I have both the Maarga and the Trishna, and they're both great speakers. Your caution is well founded, as most single driver implementations, while being superb for midrange heavy program material, have trouble playing a wide range of music well (because they're not truly full range).
Rethm designs all of their speakers for full range performance. Zu is another single driver designed for full range, but I prefer the sound of Rethm personally. In terms of full spectrum performance in a single driver design, it would be tough to do better than these.
As far as amplification, I get plenty of scale and authority from only 6 watts of SET. I had 15 watts of push pull power that didn't really compare, so wattage alone is not everything. If you're going with Rethm and need tube amplification, I would stick to SET; in terms of power output you won't find it lacking if you choose the right amp. Good luck.
I have both the Maarga and the Trishna, and they're both great speakers. Your caution is well founded, as most single driver implementations, while being superb for midrange heavy program material, have trouble playing a wide range of music well (because they're not truly full range).
Rethm designs all of their speakers for full range performance. Zu is another single driver designed for full range, but I prefer the sound of Rethm personally. In terms of full spectrum performance in a single driver design, it would be tough to do better than these.
As far as amplification, I get plenty of scale and authority from only 6 watts of SET. I had 15 watts of push pull power that didn't really compare, so wattage alone is not everything. If you're going with Rethm and need tube amplification, I would stick to SET; in terms of power output you won't find it lacking if you choose the right amp. Good luck.