What is the best way to determine sensitivity in a room? I am placing a spl meter one meter from the M80 and I can achieve peaks of 116db at one meter before clipping from my onkyo 875. The onkyo can put out about 300 watts into 4 ohms before clipping. From this
116db/300w/1m
113db/150w/1m
110db/75w/1m
107db/37w/1m
104db/18w/1m
101db/9w/1m
98db/4.5w/1m
95db/2.25w/1m
92db/1.25w/1m
approx. 91db/1w/1m
I know that I cannot be sure that my 875 is putting out the rated 300 watts at clipping and the output is significantly affected by the quality of the input signal but it must be close within 1db. Note that 116db is best case scenario with the best quality input source I could find.
If the M80's produced 95db/1w/1m in my room then:
95db/1w/1m
98db/2w/1m
101db/4w/1m
104db/8w/1m
107db/16w/1m
110db/32w/1m
113db/64w/1m
116db/128w/1m
This means that my 875 would be putting out 128w into 4 ohms before clipping. I don't think this would be correct as the 875 is rated at 140w into 8 ohms. My 875 is set to an impedance of 6-16 ohms to avoid any current limiting. When the 875 is set to 4 ohms I can hear a signficant reduction in output due to the current limiting.
