You're making this too hard (although I think you should understand the math):
Port Length Calculator
Port Length Calculator
The import costs to get the port here would be too much, the port wouldn't fit on the front wery well with design (I don't like back ports that much) and I'm just a slot port wh.. Addict!
Ha ha, ok, I take your word for it..
There will probably come a time when the only things that exist in the world will be on line calculators.......then, what will we do for fun?...
Anna,
Looking at your figures above, I believe you have it correct: shelf port 0.45" high by 7" long. My best guess is that this should work just fine. (although you should remember what Ben Franklin said: Free Advice, worth every penny you paid for it.)
Changing from round to slot will have some effect--greater surface area means more friction with the air slug in the port. Dave Dlugos (P-10) uses this feature in his Fonken and related designs to good effect.
If you want to compensate for the internal volume lost to the thickness of the slot plate, you might add 0.3" to the height of the cabinet. If you want to do a round-over on the ends of the slot plate, then add a fraction of an inch to the length to compensate; exact length depends on the radius of the round-over.
Cheers, Jim
Looking at your figures above, I believe you have it correct: shelf port 0.45" high by 7" long. My best guess is that this should work just fine. (although you should remember what Ben Franklin said: Free Advice, worth every penny you paid for it.)
Changing from round to slot will have some effect--greater surface area means more friction with the air slug in the port. Dave Dlugos (P-10) uses this feature in his Fonken and related designs to good effect.
If you want to compensate for the internal volume lost to the thickness of the slot plate, you might add 0.3" to the height of the cabinet. If you want to do a round-over on the ends of the slot plate, then add a fraction of an inch to the length to compensate; exact length depends on the radius of the round-over.
Cheers, Jim
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