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The 1/2 foam is fine on 1/2 plywood. I was talking about the cost. Using those 2 products cost more than some other methods. Foam really quiets motor noise down the best. I didn't understand that was a concern of yours. I do HO and motor noise doesn't concern me as much it seems to matter to N scalers. I guess from talking to and seeing N locos they grind a bit more than HO, is that correct? Try sticking it to the plywood with Silicon in caulk tubes. This should further dampen sound transfer.
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