Posted by Brian Walsh on December 19, 2005 at 14:00:32:
In Reply to: New Sound Lab model; trickle-down from Majestic posted by Duke on December 15, 2005 at 17:18:23:
The M-1PX has just over 10% more radiating area compared to the M-1. The width of the PX panel is 4 3/8" wider than that of the M-1 (39 3/4" vs. 35 3/8"). This is due to both the 45 degree angle of the PX and the wider stator of the PX. The extra radiating area doesn't add very much to the overall response; it provides about 1 dB more sensitivity and dynamic range in the lower frequencies. However, it lowers the low frequency cutoff frequency by 10% compared to that of the M-1.
Reducing the dispersion angle by 50% theoretically increases the sensitivity by 6 dB due to doubling of the energy density. This assumes an anechoic environment. In the real world, the effect is not quite as dramatic because a large portion of the sonic energy in a room is the reflective field. Depending on the listening room parameters the increase in apparent sensitivity is on the order of 3 to 6 dB.
Brian