I was curious to see what are the latest thoughts and what people are doing for designs of a subwoofer in a cabinet with closed doors.

What treatment is used and how the sub is isolated from the cabinet ?

We have in the past always cut out the floor of the cabinet and provide 4 inches minimum around the subwoofer.

We use anti-skid mats like the ones found under rugs on a hard wood floor to prevent
the sub from moving on the floor inside the cabinet.

Mostly curious what treatment is used if any inside the cabinet and a source for
acoustical foam to line the inside.

Thanks, in advance

Peter

cut the bottom out of the cabinet so the sub sits on the actual floor, cut vents in the toekick (have cabinet guy do this), dynamat the inside of the cabinet, make sure latch for closing will not rattle if so change it to be more secure (have cabinet guy spec it), if there are glass shelves inthis cabinet with metal supports-felt the bottom of the metal supports,

last but not least explain to the client that this is not the most optimal solution

or you could try this but it may not be in the budget
[Link: jamesloudspeaker.com]

You could use Foam, or Owens Corning fiberglass batting, similar to what is preofessionally used for bass traps.

Are you talking about reinholtz resonator (Bass Traps) ?

because they need to be several feet thick depending on frequency and engineered to properly trap bass. ie.. x amount of holes per cubic foot.

Correct me if I am wrong but as far as I know foam unless it is very thick does nothing for bass absorbtion the length of the bass wave is too long for the foam to have any friction or absorbtion properties.

I could just build a baffle wall so only the grill is showing but that eliminates the rear wave which for must midfi sub designs is critical.



Thanks for the replys

Regards,

Peter

Helmholtz resonator. Didn't Reinholtz play for the German national team as a forward?

We generally strap the sub down to the floor with a cargo strap. Works great.

How about something like the following? I've never used it (have a sample sitting in my garage, just haven't set it up yet), but it seems with this you may not need to cut out the bottom of the cabinet floor?

Gramma Isolation Riser

There are foam sheets that are impregnated with high density particles that are commonly used to control noise from industrial equipment... And like you were saying, regular foam is not very acoustically opaque.