Coupling vs. Decoupling for Bass Response

auto salvage sissor jacks and beams for temporary support,plus the carpet over padding?

Jax, if you can work on the support under the floor, especially where the speakers are, do it. You might have to run a couple 4x12 beams underneath with adjustable posts, height depending, underneath them. If the support underneath, joist, posts are solid, check to see if any of the pine planks are loose or warped. Nail or screw them down. If they are shot, replace them or use some 3/4" plywood as a area sub floor. If the joist are more than 16"oc, see if you can put some additional ones in. It will cost you quite a bit to do the whole room, just concentrate where the equipment is first, then the listening area.

A 1400 sq ft room (20 x 70?)will be tough to fill with bass regardless of the flooring. A well-matched sub-woofer might be in order.

Apart from the excellent suggestions above, you might want to stabilize the speakers themselves by placing some very heavy concrete pads on the floor and then use padding material (per Newbee) and/or spikes on top of that. At least you might be able to keep the cabinet itself from moving with the bass waves. Just a thought.

Hi Marco,

You are correct that the pointed spikes are coupling your speakers to the floor and their vibration is causing negative effects such as directing unwanted vibration towards the equipment rack, your listening location, possibly to neighbors, etc. Much of the speaker's energy is being used to set your flexible floor in motion rather than is producing music. Not only is your bass response being compromised but much of the musical range is being affected as well. This is the case for all suspended wood floors and is a significant issue for many audiophiles. It is also an issue for concrete floors but not quite to the same degree.

The best method to deal with your issue would probably be more expensive than you have in mind but there are a few inexpensive solutions that will be helpful. If you mass load the floor under the speakers much of the floor's flexing will be minimized. Some other areas of the floor may also benefit from mass loading. You mentioned that you are on a loft so floor jacks under the joists is probably not an option. You should also decouple the speakers from the floor and from any massive supports (the exception would be a high mass support that is also highly absorptive). There are high quality and inexpensive compliant feet available that will accomplish this. You can contact any of the major audio suppliers for a specific recommendation.

Best Regards,

Barry Kohan

Disclaimer: I am a manufacturer of vibration control products.

It's not the speakers, it's Diesel the dog that's pounding the floor with his big paws.

Put tennis balls on each of his four feet and see if that helps.

By the way, I'm jealous that your studio is so much bigger than mine.