Effects of concrete as base for subs, speakers and potentially equipment

@mpoll1 Wrote:

Effects of concrete as base for subs, speakers and potentially equipment

I chose concrete blocks and lead to raise and decouple the speakers from the wood floor. Concrete is a great energy sink and lead adds damping. I am very pleased with the results. Each speaker has four 35 pound solid concrete blocks and 30 pounds of lead. The speaker sits on a 170 pound energy sink. See my systems page left speaker. Wanted to hear how it sounds, before I did both. 😎

Mike

See below JBL Project K2-S9500 speaker introduced in 1989 was design with a concrete energy sink for it's base.

https://www.audioheritage.org/html/profiles/jbl/k2.htm

I added thick beam in my cellar, placed vertically from floor to roof, hammering it into place so it should take the weight off my record player and system. One of the best investments I ever made. I can jump up and down before my record player, no skips.

@OP If you have wooden floorboards, one problem with putting concrete slabs under speakers is that it can be difficult to get the slab to be stable. Personally, I favour making platforms of thick ply and screwing those into the floor. That provides a stable bass and stiffens the floor.

Heavy masses under electronics can be hit and miss. Resonance control requires the mass to be damped. Mass by itself will resonate by at low frequency and will continue to ring if it is not damped.

This is why i use some tuned mass damping  with two sets of springs under and above  differently compressed ...

Heavy masses under electronics can be hit and miss. Resonance control requires the mass to be damped. Mass by itself will resonate by at low frequency and will continue to ring if it is not damped.

Interesting stuff..👍