It's not needed for SPL reasons per se but more to help even out the bass response in the room as well as give you stereo bass. I know folks say you can't hear where bass is coming from and that is true...but the harmonic overtones they create (if that is BS...just someone tell me) are directional and I think for that reason you should have stereo subs.
Besides, if you can get a second one used here on Audiogon for a good deal, then do it. If it turns out you don't like the addition, then sell back here.
that's how I learn about audio equipment and speakers. I buy them. Listen to them and then evaluate their performance compared to past gear. If I don't like it, I sell back on Audiogon where I picked it up. usually I don't even take a loss.
Besides, if you can get a second one used here on Audiogon for a good deal, then do it. If it turns out you don't like the addition, then sell back here.
that's how I learn about audio equipment and speakers. I buy them. Listen to them and then evaluate their performance compared to past gear. If I don't like it, I sell back on Audiogon where I picked it up. usually I don't even take a loss.