Did you ever buy too much bass?

@sgreg1 Appreciate the tips. I will set aside an afternoon for experimentation with suitable material that I know well (or believe I know well).

For my mid-sized room setup was the key. I have a modest KEF LS50 Metas + a single KC62 sub. The goal was to provide some foundation and also crossing over the LS50s at a frequency that would remove the low bass burden. While my initial setup sounded pretty good I still felt there was imbalance. I went through the sub crawl and finally found a spot that was 1) not too intrusive into the room, and 2) made even acoustic stand-up bass sound like it was coming from the actual performance placement. It's amazing that even 1" of sub movement makes a difference in my room. Now I'm wondering what a second sub would add and if it would just pose more placement variables that I would have to deal with. 

Tomsch , I used to have one sub only? Like you I wonder if I will add more sub? I thought SWARM system of audiokinesis would be a phenomenal addition, unfortunately I have no more room for extra Amp nd four sub.Knowing that the modified pioneer sub are excellent? I bought a pair from a guy in UTah . Once I was able to integrate them on my system? There is no going back.The KLH model 9 did became more holographic and instruments sounded natural with weight.yes if you have room 2 or 3 or even 4 is good.

I have several amps but one blows away anything I've ever owned or auditioned. The Mcintosh Ma6550 is unbelievable in its bass... you don't need a subwoofer with this amp at all. I have the bass turned down almost all the way when I listen to music otherwise it will blow you out of the room. If you have doubts, try one out if you can find one.

Bass is a strange creature. I was running a small 8" sub that only went down to 40hz, but wanted more bass, so I bought another 8" sub.

At the listening position, the bass was softer like I was in a vacuum, but as I walked out towards the edge or stood up, the bass was booming hard! Poor neighbors.

I learned the second sub activated standing waves and nulls and achieved the opposite of what I wanted. I went to one properly positioned bigger sub and now life is good again.