kenjit is right for a refreshing moment.
I’m surprised if you get 90 dB in room with those 83 dB sensitive transducers.
Try some Ice power OR get some >90 speakers with the QS.
What we have here is
"A Failure To Communicate"
Even this sez you need => 92 dB with the 60's:
http://www.kaplanhtdesign.com/QuicksilverAudio_Sixty_Watt_mono.html
I’m surprised if you get 90 dB in room with those 83 dB sensitive transducers.
Try some Ice power OR get some >90 speakers with the QS.
What we have here is
"A Failure To Communicate"
Even this sez you need => 92 dB with the 60's:
http://www.kaplanhtdesign.com/QuicksilverAudio_Sixty_Watt_mono.html