Originally Posted by MKtheater
How were those numbers measured? 2 meters or 1? Outside or inside?
This is how Don Keele describes the frequency response measurements
"To assess the frequency response, I made ground plane measurements, placing my test microphone 2 meters from the port and the driver. The results are essentially identical to those from standard 1-meter, anechoic measurement."
Don measured and published peak output numbers both with and without room gain.
"With room gain, the maximum peak acoustic output starts with a very high 101 db at a very low 12.5Hz, passes through 110 db at 16Hz, then rises rapidly to a local peak of 114db at 20Hz. After a slight dip to 113db at 25Hz, the output rises to 117.5 db at 50Hz, heading up (after another slight dip) to 120 db at 95Hz before falling slightly to 118 db at 200Hz."
It should also be noted that Don used his Crown Macro Reference amp for all testing and listening along with the HSU Electronic Crossover. The 60 pound Macro Reference is capable of 10,000 watt instantaneous peaks and that in the maximum peak output measurements, Don reports that the HSU TN 1220 HO was receiving over 1,000 watts at some frequencies. 1,350 watts at 20 Hz, for example. Of particular note is that at frequencies above 75 Hz, the Macro Reference was delivering extremely high wattage. Specifically, the Macro Reference delivered 6,500 watts to the HSU at 200Hz.
Tom Nousaine used a Macro Reference for his IB system which generated 129 db at some frequencies. That was back in 1999.