Audio Science Review of Expert 200.

[thumb5]

Thinking about my own results a little more, I got to just under 6 watts with SPL's in the mid 90's, at 0dB gain.  Not that loud or that much power.  Considering the 10kHz tone was at about -18dB, these numbers actually look about right.  Certainly not super accurate, but in the right ball park.  So in theory, if the gain is then increased to +18, or a full 0dB test tone is used, then mathematically this would need about 380 watts to produce the tone at 113dB. 

It would make sense to me if the meter on the front panel displayed peak level rather than RMS, in which case a reading of -18 dB would mean the test tone was at -21 dB (RMS).  If that assumption is right, scaling up from the ~6 W you measured would mean about 750 W output into 4 ohms for 0 dB (RMS) input.  In the right ball park, as you pointed out.

Anyway, no tests are planned today - Time for some music ….. 

Good plan