Dbl refurbishing LF cabinet acoustic foam

[Charlie]

I’d have to look it up myself again, but it’s mentioned somewhere up in this thread …

[delft]

Hi Leadpin

I used the same foam manufacturer as Charlie.

Custom Foams.

Not cheap but the overall end result on my DBLs has been superb.

Karl

[Leadpin]

Hmmm, recently I found a sound acoustic shop. They sell these foam

I will cut it and replace it. Since I’m all the way in Malaysia, 75£ for the interior foam for the allae is ridiculous personally and also not including shipping.

[JimDog]

I just ordered 1 sheet of ‘Acoustic foam flat sheet’ soundproofing foam from efoam .co.uk.

“Significantly reduces reverberation, reflections and flutter echoes.”

Sheet size: 25mm thick x 76 cm wide x 100cm long.
£17 inc. delivery.

Will let you know how it sounds after I install it.

[JimDog]

Hi AHT and @bongoman
Detailed Q re SL2 top cabinet pads:
Did you cut a notch in the top of the pad before inserting it to accommodate the wooden brace in the top centre of the cabinet?
Or did you just cut the top of your pad straight across and force that down under the brace (as per the original pad)?
Thanks
Jim

Anyway - I’ve just cut 4 pads with notches in them, and they seem to fit tight and snug.
For reference, I cut pads that are about 15cm x 11.5cm - from 25mm thick acoustic foam. The notch was 6cm from the rear end of the pads and was 2cm wide and 3cm deep.

Do you know what the main purpose of the foam is?
Is it mainly to dampen the vibrations of the wooden cabinet?
Or to stop soundwaves echoing around inside the cabinet?

(Apologies for thread drift from DBL foam!)

[JimDog]

hey just plugged them back in

cymbals sound particularly crisp and clear on test tracks

[AHT]

@JimDog Yes, I also cut out notches, similar to yours.

[JimDog]

Many thanks for encouraging me to do this.

A bargain for £16!

[bongoman]

@JimDog

Looks good. I cut out notches too based on paper templates from the original foam.

[JimDog]

Hi AHT and @bongoman

Do you recall how thick the foam was you removed from your SL2 top boxes?
Mine was approximately 25mm thick.

Someone on my SL2 foam thread has had great SQ results with 12mm foam backed with cardboard too:

SL2 owners - MUST READ: re. foam

Agree so much with everything on this thread! I couldn’t believe the difference when I replaced the top cabinet foam on my gorgeous maple SL2s a week ago. They were amazing before, but now they are simply wow! I didn’t even know there was foam in the top cabinets until I read about it in the DBL restoration thread… a fascinating read, incidentally. When I checked, my foam was crumbling really badly… I couldn’t even get the foam out in one piece. Just crumbled into dust. Since the foam looked ve…

(Looking at your photos in the post above, @bongoman, it looks as though you replaced your foam with something about 25mm thick - as I did.)

thanks
Jim

[bongoman]

I can’t recall the thickness of the original foam. I replaced with two foam layers.

I no longer have my SL2 so can’t check but the total thickness of 25mm sounds about right.