Quote:
Originally Posted by W9TR
Serge,
Interesting video. What was missing was a measure of how loud it was getting on peaks in the room.
The iPhone is an average reading device.
The calculator you linked ignores the room acoustics (live vs dead) and the size of the room so is inherently flawed. It won’t even be close and will overestimate the power you need.
A live room will get you significantly more level due to the reverberant sound field.
So your iPhone meter is probably closer than you think!
Tom
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My room is on the power sapping, damped side with thick carpet and fabric couches and chairs. I tested again with the Radio Shack meter which measured 2dB lower than the iPhone for what it’s worth. In any case, the important test here was that the 70w in ultra linear mode is more than enough power for my typical listening and chances are this amp will be partnered with smaller Harbeth speakers in a much smaller room anyway.