FYI:
You can easily sim a Topas style cab in MJK's BLH worksheet. For a first approximation use a vented box program to calc a T/S max flat to get the base cab's Vb, then using the linear flare, make S-throat = SL and S-mouth = Sd, with the length = either 13560" or 34442.4cm/8/Fb.
Once you get an acceptable design it's just a matter of folding it up to suit.
GM
You can easily sim a Topas style cab in MJK's BLH worksheet. For a first approximation use a vented box program to calc a T/S max flat to get the base cab's Vb, then using the linear flare, make S-throat = SL and S-mouth = Sd, with the length = either 13560" or 34442.4cm/8/Fb.
Once you get an acceptable design it's just a matter of folding it up to suit.
GM
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