Speaker reinforcements

Some 3-piece boxes have cheap, thin plastic walls that resonate and add a boxy coloration to the sound. Adding fiber mat doesn't always solve the problem. So I'm thinking of installing some kind of spring-loaded rod, or threaded rod, that would stretch between 2 walls and put some tension on them. Something like a shower curtain rod. But obviously those are too long.

A simpler idea would be to cut some pieces of wood, like from an old broom handle. Size them right for a snug fit, and just glue them down.

Anyone do anything like this?

My Sanyo C35 has timber reinforcements like you suggested: (Factory)

I've never put any kind of structural brace inside a speaker enclosure, but I have used a product called cover tape to add density to plastic cabinets. It's actually a rubber roofing product used to cover edge metal and small flashing details. It's uncured (sticky) on the back side, is very dense, and comes in a 100' x 5" roll.
That, with some poly-fill batting, definitely made a difference for the better on my Pioneer C-3.

The Silver SR5000 speakers have a metal reinforced strong bar factory fitted & it's a very tight fit.............

One inch PVC pipe should work well. I think that will make it more rigid. Paint it to match the speaker color if you want!

jimmyjimmy19702010 said:

My Sanyo C35 has timber reinforcements like you suggested: (Factory)

IMG_3388.PNG

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Uh, you sure nobody else has been in that box?

superlew said:

I've never put any kind of structural brace inside a speaker enclosure, but I have used a product called cover tape to add density to plastic cabinets. It's actually a rubber roofing product used to cover edge metal and small flashing details. It's uncured (sticky) on the back side, is very dense, and comes in a 100' x 5" roll.
That, with some poly-fill batting, definitely made a difference for the better on my Pioneer C-3.

Click to expand...

Just did a search for cover tape.....That stuff is expensive!!!

Nickeccles said:

The Silver SR5000 speakers have a metal reinforced strong bar factory fitted & it's a very tight fit.............

Click to expand...

Never heard of that box, got any pics?

BoomboxLover48 said:

One inch PVC pipe should work well. I think that will make it more rigid. Paint it to match the speaker color if you want!

Click to expand...

I think wood would be easier to sand to fit

jimmyjimmy19702010 said:

My Sanyo C35 has timber reinforcements like you suggested: (Factory)

Click to expand...

Had the same thing in my Sanyo C15!

Reli said:

Just did a search for cover tape.....That stuff is expensive!!!

Click to expand...

I do have somewhat of an advantage as a project manager for a roofing company.

I'm not sure if rubber roofing (EPDM) is an industry standard in CA, but if you're walking by a commercial job site and nicely ask a roofer if they have a small piece they'll probably give you some for nothing - I know I would.

I've also seen people use a product called Peel-N-Seal, which they say is available at places like Home Depot, although I've never seen it. I guess it's very similar to Dynamat, but way cheaper. I use cover tape because it's easily available for me and it's denser than Dynamat.

There is a peel and stick damping material for automotive application. This is expensive.

This goes inside the door skin area and other places. This is expensive. I have some in the garage. I will give more details on the make.

I see people are selling adhesive Sorbothane on Ebay, and there's a Dynamat imitation as well.

I'll get some wood sticks from Home Depot.

Thanks everyone!

jimmyjimmy19702010 said:

My Sanyo C35 has timber reinforcements like you suggested: (Factory)

IMG_3388.PNG

Click to expand...

Same with my Sanyo C2 - though they only use a single slice of wood in each cabinet.