Originally Posted by zheka
Good question. I do not personally know what makes a driver good or bad for EQ though I suspect SPL and power handling maybe useful indicators.
For me the takeaway message from the quote is that how flat the sub measure is irrelevant no matter what, in the modal region the room is a bigger factor anyway.
The prerequisite for knowing anything for a consumer would be to know what is their preferred EQ setting..... This can vary by content (many like different curves for movies/music) and loudness. They would need to understand the various contexts and how they affect things to make a good decision.
Assuming first that we have a system capable of producing a flat response, we can save the "current" eq as the baseline.
Now, you could have the customer listen to different content and vary the EQ to their taste. This would need to be done at different levels (i.e. 75, 85, 95 dB, etc...), as our perception of the loudness of different frequencies varies with the intensity. After a long and exhausting gathering of data we would have the customer's ideal EQ settings for various sources/volumes....
The customer could then take their various EQ settings and find the most demanding one of the set and look for a subwoofer which could match that setting up to the level (dB) they prefer. A really cool processing system could apply their various preferences as sources and level change dynamically....
A sub may produce 120+ dB at 50 Hz, but after you EQ it to your preference, you may only reach 110 dB, since you've essentially chopped off the top to bring up the lower frequencies.
A sub with a naturally flat response and a sub with a processed flat response are two different animals.
I will take the one which can produce the curve I want at the levels I want.... I'll do my own EQ as it most likely is not flat not one of the provided "presets". Everyone is different.
Everyone's perception of loudness and frequencies also varies from person to person, so to keep a system in its tip-top EQ, it would need to be regularly calibrated to your own tastes. Lets not even add how aging affects our hearing....