as an example i had my Verity driven with NAF 845SE 28watt stereoamp and although 95Db at 8 ohms nominal it was a j*ke i'm sorry to say.
it not only has to do with impedance, electrical phase behavior is way more important.
the volume behind the woofers and the size woofers in itself are all depending too.
30 watts may be all you need, but i have experienced too many amplifiers to look at watts only.
there may be 50 watts which are the most authoritive watts ever, there may be 600 watts as the most tiresome watts ever. it is all about topology and design -read powersupply- which makes or breaks any amp.
the Wavac 833v1.3 is one of the very best amps i ever heard, and at the same time one of the most authorative amps too. that comes at a price my friends.. after the 833v1.3 SET life will never be the same.
Wavac has reputation to really drive with authority opposed to many other SET amps.
