Enclosing a down-firing sub like that may present some problems. I'd toss the scenario past Outlaw tech support, but my initial response is similar to curegeorg's -- you may be hindering the LFM-1 by doing this.

Spiker -- nice marketing work. You know, acoustics also require some extra consideration within the HVAC system as well...

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review