Alpair 10 MLTL Prototype Plan

This Alpair 10 MLTL prototype plan was supplied by Dr Jim Griffin from DIY Audio Forums

My Alpair 10 MLTL prototypes were built from solid cherry hardwood for the sides and top with MDF for the front, back, and bottom panels of the box. The overall external box dimensions for my enclosure (with 0.75" thick material) are 47" H x 7.5" W x 6.75" D. The internal dimensions are: length (top to bottom) 45.5", driver distance from the top 15.5", port distance from the top 44", with a straight cross-sectional area of 6" wide x 5.25" deep, stuffing density of 0.50 lbs per cubic feet, and port radius of 1.03 inches with a port length of 4". I'll take photos this weekend to show-off the new speakers.

The stuffing density is 0.5 pound per cubic foot. In my prototypes I used Acousta Stuf(Trademark) damping fiber but similar material will suffice. The stuffing should extend from below the driver to the top of the box. I place a coarse metal grid or screen on top of the internal brace to prevent the stuffing from falling below the brace and tease the material as I fill the cavity. No stuffing is placed below the internal brace.