Which amp will cause a larger increase in electric bill?

Threshold SA/4e or Threshold S500 II? How to determine? I cant find idle draw on SA/4e.

Thanks.

jpainter23601-03-2019 7:29pm

gs5556 Details Discussions Posts This discussion Message User 1,209 posts 01-04-2019 at 07:31am Copy Comment URL Report Comment Edit Delete Class A amps draw approximately 5 times their rated power at idle (and at load). The 100 wpc SA/4e will probably draw about 1,000 watts or a kilowatt hour of electricity when it’s powered on.
gs5556 Details Discussions Posts This discussion Message User 1,209 posts 01-04-2019 at 11:23pm Copy Comment URL Report Comment Edit Delete My 100W class A Levinson 20.6 mono draws 500 watts at idle (4 amps measured at the breaker). That’s 20% efficient and it is most definitely a push-pull, not single-ended. The 100 watt Pass XA100.8 mono draws 420 watts at idle. I am pretty sure that one is a push-pull also. Push-pull amps have UP TO a 50% efficiency. I know for a fact the Levinson has a push-pull Darlington in the driver stage to keep a surge of bias current flowing for the output stage, which adds to the inefficiency.