Hi gonk,

I just did another test. First set my PC to output analog signals. I figured there was some difference in using digital signals. I used a Galaxy CM-140 SPL meter to take measurements. I had C-weighting enabled and "Slow" mode selected. I was in the "Medium" range (I think it's 50 to 100 dB).

First, crossover frequency did not seem to make a difference. Also, the sub selection of "LFE Only", "L+R+LFE", etc. did not seem to make a difference.

All measurements were taken using Bypass Mode.

So, to recap, I'm taking SPL measurement using pure tones sent using an analog signal from a PC. The 990 is in Bypass Mode for all measurements. The only thing I'm changing is the status of the mains from "Large" to "Small". I also scrolled through crossover settings and sub "configs" while measuring, and those seemed to have no effect.

Freq=76 Hz
Mains Lg = 73.1 dB
Mains Sm = 69.1 dB

Freq=50 Hz
Mains Lg = 63.4 dB
Mains Sm = 53.8 dB

I would expect there to be no change for the mains SPL readings based on Large or Small settings when using Bypass Mode.

Am I missing something?