[CBRworm]

I have a different isolation question than normal. I have moved weight room and my system up to the second floor. The second floor is not concrete, but wooden joists with plywood (or something similar) covered with padding and thick carpet. With my speakers sitting on the floor (they are mid size floor standing speakers) the whole floor resonates with the music. This means that downstairs (and outside) everyone gets to listen to my beat. The house is a CBS block house. I would like to do anything reasonable to keep the noise upstairs and inside.

The speaker cabinets weigh about 60 pounds each. I tried putting a 45 pound weight under the speakers thinking that the mass would deaden any resonances but it doesn't seem to make a difference. I can put them up on short stands if it would help but I thought I would get some 'professional' opinions first. I thought about putting some kind of gel between the speakers and the floor.

I am not concerned about the impact on sound in my room as much as minimizing it outside my room. My neighbors are old (as in retirement old) and they congregate in front of my house shaking their heads. Of course none of them actually ever say anything to me other than one guy who commented that I must have a pretty powerful stereo. None of them ever go to work either.

[joetama]

This is a very interesting problem that you have.

Something you might try as a cheap solution is a set if 'isolation' feet. This would help to dampen the direct loudspeaker to floor coupling. But, it could cause a reduced low frequency response.

Here are some isolation cones.
Cones

If you don't want to drill holes in your speakers these might work as well.
Cones 2

If the floor is resonating because of the front waves of the speaker and not vibrations transfered the only thing you are going to be able to do is to turn it down.

[JimJ]

I've got a similar situation, minus the crabby neighbors. I currently have my BIB's just sitting on the carpeted floor, I bought a set of spikes but I'm waiting to put them on until I get the cabs stained and finished, put binding posts on...etc. Being lazy, pretty much.

I'll ask my neighbors if they notice a difference

I doubt it, though, with the crap I hear emanating from the apartments downstairs I doubt they'd hear any of it...

[CBRworm]

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.

[Hic]

without modifying the house your best bet would be to move.

There are deadening products, etc..,

Kinda reminds me of the cars on the streets { boom, boom, sizzz ... license plates a rattling, hoods a flexin },[ zero preparation ]

[amsignal]

I agree with hic, modifying your house, or at least the room your speakers are in, sounds like the only option. Either that, or just turn your speakers down.

[jvc]

There are products like these: http://www.auralexelite.com/products...id=26&bundle=0 They are meant for subwoofers, but can be used for any situation. You might could build your own..........