Use some polystyrene sheet as insulation inside the box and maybe also mount it on some rubber feet so it doesn't transmit as much sound/vibration to the floor. Alternatively why not build a home for it outside the wall with insulation and pipe the air in.
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Phil
'67 C10 long fleet.
350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon
2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission
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