I'd say that's accurate. The amplifiers are slightly more powerful, but as we all know the difference between 100w and 100w is nothing, 150w is a measly 1.5dB gain all things the same. The sub 1500 is a hell of a lot more sensitive than the 1000. Listening to Jean Victor Guillou's pictures at an exhibition on the organ, which is a torture test for subs considering the recording seems to have unlimited bottom end, the driver barely moves at a volume of 100dB. Movies have been the same experience.
The amplifiers may seem a bit underpowered on paper, but even on the sub 1000 I managed to achieve 108 dB using low passed pink noise with no audible distortion or port noise. I haven't played around with the 1500 yet but I can only imagine that even in a large room one could easily achieve the 115dB required for reference listening peaks.
I still think there's something wrong with that measurement. Per a conversation with the PE tech, the port is tuned to 25hz, the drivers Fs is 25hz, and plugging the t/s parameters into a calculator along with the box volume and port diameter/length gives you an f3 of 25hz. Someone else took measurements on avsforum and got 25hz as well
Tuning a box and port above the Fs of a driver would be an incredibly stupid design decision that would create a "one note wonder". I hardly believe they would do that. Parts express has always been fair and honest with their low frequency ratings of their subs and speakers, as every one of them I've owned has measured -3dB at their claimed response.
Sent from my SM-G360T1 using Tapatalk