Originally Posted by craigsub
As for SVS being involved with getting someone to do what has happened here, I don't think that is what happened. Ron and Tom are genuinely good guys who are proud of their product line, and deservedly so. I just don't think they are the type to pursue a path as suggested here - so please, let's stop that speculation.
Thanks Craig. Sorry I'm late to the party; yesterday a few people asked me to check on this thread and provide comment on same.
Stan's comments and opinions are his own. No one at SVS knows Stan, except TV. SVS didn't ask Stan to post here to throw a wrench in Craig's thread.
I'm not throwing him under the bus either; by many accounts he's a legend in the DIY subwoofer community and has past associations with Deon B., Paul Scarpelli, Tom Nousaine, John Janowitz, etc. and was also one of the first to pioneer subwoofer measurements, experimenting with S/T Spectra, using the RS meter with correction factors, etc. It's a shame he got off to a bad start with you guys, because he probably has a lot to offer if we could all figure out how to peacefully co-exist.
Regardless, if I took real exception to anything Craig was doing, I'd post here myself. Aside from peak SPL monitoring on bassy scenes (something anyone at home can try) and FR at the listening position, I've long since eschewed any sort of indoor testing for various reasons.
If anyone really wants to compare the overall output capabilities of two subwoofers, I would suggest testing outdoors groundplane at 2 meters for any/all of the following tests:
1) Reverse sine sweeps at progressively higher levels to the onset of output compression.
2) Distortion-limited SPL at discrete frequencies using the CEA 2010 weighted harmonic distortion cap limits.
3) Max output (without respect to distortion) using a combination of sine waves (a favorite of JJ's over at Secrets) - maybe 25, 32, 40, 50, 63.
4) Max output (without respect to distortion) using broad-band pink noise (a favorite of Seaton's and Wiggins').
5) Peak SPL (without respect to distortion) at discrete frequencies using a 5-cycle shaped tone burst (aka "boinkers"), per Yates in the WDD shoot-out.
True max output limits not withstanding, the indoor FR at the listening position can (obviously) account for relative differences in output over any given portion of the pass band and that is more than likely what people are responding to when comparing two given subwoofers and forming subjective opinions of same.
I would encourage Craig to use the TrueRTA QuickSweep function to plot the level-matched FR of each subwoofer from 10-100 Hz on the same graph at the listening position, with each sub in the same test location. There may indeed be differences of 3-5-8 dB (or w/e) at various points over the pass band, and these will definitely affect the acoustic signature of the competing subwoofers.
At that point the subs can be ranked on the sound quality with their "native" FR. With the availability of PEQs like the BFD, SMS-1, DEQ2496, DSP-30, etc. owners/reviewers then have the option (or not) of re-shaping the FR for a flatter in-room response and then re-evaluating the subs again.