More on A7 Cabinet Resonances.

[dread64]

Folks,

How about making a sandwich?

Take a sound dampening sheet, commonly used in automotive applications, and place it between a sheet of MDF or Baltic Birch, and the flat surfaces of your mighty A7 cabinets, then screw it down. Do this top and botttom of basshorn, sides, top, and rear of cabinet exterior.

It is available from distributors (such as P.E.) in various grades, sizes and prices.

I intend to try it. Anyone care to join me?

Any thoughts, contructive input?

Dave

[GM]

Greets!

Not me. Constrained layer damping construction can work extremely well, but like most things, the Devil's in the details for best performance. Every place it's clamped creates a 'hotspot' where most of the damping is negated, so for best performance the fewest number of clamping points is best, so none except around the edges, plus these should be only tight enough to make 100% contact with no additional squeezing. Simple in concept, but hard to get right in practice and why folks used sand filled double wall construction to be sure.

Still, even done all wrong will yield significant improvements on the plywood cabs, though somewhat less so on the MDF units.

An easier/cheaper solution is to add a layer of MDF on the plywood cabs or plywood on the MDF units using a lossy/non-hardening adhesive as the damping medium.

Anyway, whichever way you want to go, these folks should be able to take care of you, and probably cheaper than through PE, etc.: http://soundproofing.org/infopages/flooring.htm

GM

[dread64]

Again, thanks for the info, and link.
This is why I came to this site: To get
the 411 on all the cool Altec tweaks.

Crank it up 'til the cops come!
Dave