Initially I was afraid that the cones would transmit more sound from the speaker enclosure
to the floor. What I have since realized is that even at loud volumes the enclosures are practically dead. My only thought now is to try to get them farther away from the floor, maybe up on stands.
I am not afraid of losing any low frequency, I keep the 50 and 100hz knobs below center as it is.
Turning it down would be a great solution, but I don't have that much will power. And it really doesn't have to be very loud to be audible next door.
If I am playing dance music with 2 watt peaks the bass is clearly audible outside.
I prefer to play it with 100+ watt peaks.
And my speakers are very inefficient old infinitys.
Maybe I should just put some satelites outside so the neighbors hear more than just the bass.
My old house was a wood frame house. I really thought that by moving to a CBS block house I would be keeping more of my noise inside.