GM has kindly offered to look at my needs via this Forum. So, here we go.
I am looking for a starting point for port length for tuning the cabs.
I could work with Win ISD except it doesn't take into account the significant room gain in the corners of the room.
Cabinet internal dimensions: H=40.5 in., W=28.5 in., D=22.5 in. 3/4 in. braced MDF.
Nett Internal Volume with speaker mounted = 13.75 cu. ft.
Positioning difficult, Adjacent corners of 12 foot wide wall. Toe-ed in as needed. Otherwise no room to move them.
Driver: 416-8B the centre is 10.25 inches below the underside of the top.
Ports: 2x4 in. ID. the centres are 6 in. above the cab floor.
Castors raise cabs 4 in. off the floor.
Poly lining: light on back and sides, curtain between driver and back but clear of port area, heavier treatment under the top.
Room: Awkward. Basically an L-shape made up from 3 12 ft x 12 ft areas. Carpeted. Hard and soft furniture Various 1/2 height windows. Distance from wall behind cabs to the opposite wall(facing the cabs) is 28 ft.
Walls; bottom 1/2 height timber with plaster board above.
9 ft. ceilings.
House: Timber framed and clad, floor is timber on piers. Probably not good for too low of a tuning.
DEQ2496 for EQ.
Amplification: SS
GM, let me know if I have missed anything.
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