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MartinLogan Dynamo IW-O High Output Back Box
This is the matching back box for the MartinLogan Dynamo IW-O open-back subwoofer (not included in this purchase)
This back box is very large, so it's only appropriate for new construction (except for rare exceptions).
Shipping weight: 21 lbs
Shipping demensions: 16" x 6" x 51"
As you can see, this back box is HUGE - but that's what makes it sound so good!!
Since in-wall subs don't have quite the force of free-standing subs, most AV professionals recommend two in-wall subs for home theater spaces (which means two back boxes).