[Wayne A. Pflughaupt]

I tried 3 corners + middle next to coach. Best position was just beside the sofa left of the listening position. Here's the sub alone at 150 hz crossover and no EQ.

Holy cow! I’m typically not adverse to aggressive equalization, but that’s an unequalizable curve, as far as I’m concerned. I’m surprised you got end results as good as you did.

Your room isn’t all that big, at least based on the diagram you showed us at Post #4 way back on the 1st page. And it’s obvious that the brick-wall response at 30 Hz you had before isn’t indigenous to the subwoofer. This sub should have no problem hitting below 20 Hz in a 1700 cu. ft. room with little or no EQ down there. Obviously something’s amiss. Your picture makes it look like your room is a typical rectangular “shoebox,” with no openings. Is there something else we need to know and consider?

I’d be interested in seeing your corner graphs. I know you mentioned before that you and your friend “both agreed that the corner placement added most punch, however at the expense of a very uneven response curve.” But I can’t imagine response being more “uneven” than this! Very often what we find with corner placement isn’t necessarily the best response, but response that’s the most equalizable. Typically the best corner is the one with the longest lengths of interrupted wall in both directions, but according to your room picture, you have no shortage of those. Again, is there something about your room I’m missing? (I didn’t read each and every post from these four pages, so I might have missed something mentioned before.)

Don’t mean to deflate your balloon – just think you should be getting a lot more from this sub in this room.

I tried using fase control etc, however didn't get any noticeble results.

I’ve noticed that we hear that a lot, to the point that I wonder if the thing even works! In your situation, with the sub right next to the couch, it should make a difference. But maybe the distance between it and the mains is more than the phase control is capable of.

Regards,
Wayne