IPB - IsoPac B
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6-feet wide x 7-feet deep x 6.5-feet tall IsoPac B - 50-60% perceived volume reduction
IsoPac B is similar to IsoPac A in sound reduction, but is slightly smaller, and allows for more of the drum kit to be seen.
There is an A2466x6 CSP with AX2412x6 Height Extenders in the front, and (3) S2466x2 SORBER baffles in the rear. The acrylic panels are a total of 6.5-feet tall, and the S2466x2 baffles are 5.5-feet tall, so there is a foot of open space around the rear of the booth and a six-inch clip-on fan to help with air exchange.
See pic for how to get in and out.