hi ralph:
i own a pair of pk quad 57. you can get bass extension with a solid state amp. wayne has used several. in my own experience, beefy power supply and more power=greater extension and fullness.
personally, i wouldn't use a ss amp on the quads. i do not like the upper mids, lower treble, where ss amps are notoriously , unbalanced, i.e., somewhat peaky.
the problem with ss amps is not bass response, it is at 1000 hz and higher. I experienced this on my magnepan as well. i got reat bass with a 350 watt class a, but female voices and violins were a big problem.
i own a pair of pk quad 57. you can get bass extension with a solid state amp. wayne has used several. in my own experience, beefy power supply and more power=greater extension and fullness.
personally, i wouldn't use a ss amp on the quads. i do not like the upper mids, lower treble, where ss amps are notoriously , unbalanced, i.e., somewhat peaky.
the problem with ss amps is not bass response, it is at 1000 hz and higher. I experienced this on my magnepan as well. i got reat bass with a 350 watt class a, but female voices and violins were a big problem.