Did you ever buy too much bass?

In my experience ported subs are efficient but the sound is not as accurate as with a sealed box sub. You also want hear the bass through the air than by shaking the floor.

I really like my Dynaudio 18s which is sealed with dual opposed drivers 9in drivers - sounds very musical and reaches below 30hz. The opposed drivers have the benefit that zero ( I mean zero) vibration is transmitted via the floor. I think this is an excellent choice for small/medium room.

I find the the best test for smooth response integration is to listen to a male spoken voice  (e..g play a podcast) there should be no boominess when the voice drops through the crossover range, or shift in perceived location. At the same time time the reponse for, say, jazz bass, should be rich, uncolored  and satisfying

@hickamore 

First is the numbers displayed and a subs crossover control are not always accurate or true. I have tested some subs with meters way back in the day that confirmed this. Now I just go by what my ears can hear and I can bet yours will hear different than mine. What I have done is turn the setting to the highest point and then turn down until I like the sound. Key is not focus on the low end but the midrange depth it adds. When adjusting the control treat like a clock and turn one hour at a time. I also have Vandersteen 2 se sig II that have a passive radiator that can deliver pretty good low end on their own. Another reason I don’t like numbers as all systems are different. Hope this helps and enjoy the music!

@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.