High Efficiency Speaker Asylum

Port Size for Altec 612C

204.13.42.55

Steelhead Mike

I'm thinking about having a pair of 612c cabinets built for my 604-8H-IIIs and I'm questioning whether or not the port size recommended by Altec in Altec Notes AN #5 for a 604-8K (48.68 sq. in./ 6 1/4" X 7 3/4") is correct for my speakers. Any thoughts?
Thanks!
M

Follow Ups:

RE: Port Size for Altec 612C - GM 23:56:33 06/30/24 (0)
Assuming it's ~the same net volume (Vb) as my '50s era specs (~6.32 ft3) then per Hornresp it's ~53 Hz, which makes it max flat if driven with a voltage amp, so once the driver displacement is factored in will cause a tiny bump up at Fb, i.e. standard vintage Altec tuning.
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
RE: Port Size for Altec 612C - rogerh113 07:22:22 06/18/24 (0)
Lots of competent help available on the Altec Users Board.

https://www.hostboard.com/forums/forumdisplay.php?f=700
RE: Port Size for Altec 612C - Bill Fitzmaurice 13:16:09 06/17/24 (1)
Model it in WinISD 0.7 and you'll know.
- RE: Port Size for Altec 612C - Steelhead Mike 04:59:03 06/18/24 (0)
  Thanks Bill.

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