I've got a couple of Peavey cabs , the old Peavey TX 210 / 175 wats per cab models, with 2 x Emi Beta 10a's mounted instead of the old Peavey units.
The internal vol of each cab measures approx. 79.5 litres, ( 39.75 liters per 10" unit ) and thats not taking into account the displacement of the 2 speaker cones or the 2 sunken handles, or the single port tube per cab
Port flare size on each cab is 3.75" diameter, though the flare itself is only about an inch long, and the actual tube itself, after that 1" length flare, opens out by about .75" so the tube is actually 4" diameter after the 1" of flare. Port tube is 4" long per cab, though for 3" of that, its 3.75" due to the flare on the tube.
Now, i dont have a comparison cab here, so i maybe ok already with the reproduction these cabs have. I dont play a 5 string, only a 4, and i dont push lots of low end on the amp. I reduce gain on EQ at 60hz and below.
Would i get any benefit from altering the tubes in any form?
Either lengthening / shortening or widening / narrowing, or any permutations of those? Or even adding a 2nd port ?
They may already be at optimum ( though i doubt it, due to the different speaker units ) or maybe there's nothing that can be done whatsoever.
I'll live with 'em no matter what
TSP of Beta 10a from US Speaker