I have a SET 2A3 beautiful sounding amp paired with a pair of vintage Wharfedale E30s 94db sensitivity 60hz - 18khz. I’ve also got a Wharfedale sub SW150 hooked up via the high level terminals to the amp.
According to the manufacturer the SET amp output transformers are 30 Hz to 40Khz…
The crossover on the subwoofer is currently set to 70Hz
The setup sounds divine, soundstage, vocals are so alive I can listen to hours on end.
The question I have is should speakers match the same frequency response as your amp or does it not matter ?