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[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[taunton-hobbit]

Try carpet underlay felt (not the synthetic 'Tredaire' type) - works a treat and can be fixed with drawing pins (!).

[Bill Fitzmaurice]

Any of the various recommended materials will work. Don't bother with the brace, it's too small to be reflective.

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Bill Fitzmaurice]

When you give the back of the cab, or any part of it for that matter, the 'knuckle test' you should hear a high pitched solid 'whack', not a low pitched hollow thud. Spline bracing is better than no bracing, but what works better than any other method is a brace that connects to the opposing panel. Bracing and damping are two areas where manufacturers cut corners more than any other, as you can't see what is or is not inside the cab unless you open it up.

[Jus Lukin]

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Edited February 24, 2022 by Jus Lukin

[luckydog]

Poly loft insulation (NOT fibreglass) is essentially the same stuff as acoustic wadding, and plenty of it. But panel resonances is the elephant, and wadding can't help that...........brace, brace, brace !

LD

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Bill Fitzmaurice]

[quote name='Jus Lukin' timestamp='1468425701' post='3090857']
The panel lining made from a cheap yoga mat I bought at Lidl!
[/quote]Assuming that's a typical yoga mat made of closed cell foam it won't work. Foam must be open cell.

[taunton-hobbit]

EBay is your friend - felt carpet underlay is 4.95/sq mtr, plus postage....that'll work........

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Bill Fitzmaurice]

[quote name='Jus Lukin' timestamp='1468432159' post='3090914']
The mat was there more to damp the panel vibration a little, as there was a bit of ringing going on from the back, despite all the bracing.
[/quote]It won't help that, not enough mass.

[taunton-hobbit]

........as I 'said' ........

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin

[taunton-hobbit]

Glad it seems to have come right for you, please post & let us know how its real-world test goes !

[Bill Fitzmaurice]

[quote name='Jus Lukin' timestamp='1468666274' post='3092487']
I'd read much about the de-coupling effects of casters and was left with no expectations either way, but once applied they made a big difference with boom-in-the-room,
[/quote]FWIW casters will have no effect, unless they stand a foot or more high. That's because there's no such thing as mechanical coupling, and it takes that much distance from the floor to audibly impact acoustical coupling. OTOH adding damping to a under-damped or un-damped cab can have a major effect eliminating midbass boom.

[Jus Lukin]

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Edited February 22, 2022 by Jus Lukin