The original manufacturer's paperwork from JBL recommends 150WPC for optimum performance.
That being said, the SET tube amp is probably a very poor idea.
IMO, the Pass X350.5 won't be much of an upgrade over the Nakamichi but the higher powered models from the XA.5 series of Class A amps would.
Dealer disclaimer
That being said, the SET tube amp is probably a very poor idea.
IMO, the Pass X350.5 won't be much of an upgrade over the Nakamichi but the higher powered models from the XA.5 series of Class A amps would.
Dealer disclaimer