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Port Size for Altec 612C

204.13.42.55
Posted on June 17, 2024 at 12:21:49
Steelhead Mike
Audiophile

Posts: 112
Location: New England
Joined: September 2, 2000
 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

 

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RE: Port Size for Altec 612C, posted on June 17, 2024 at 13:16:09
Bill Fitzmaurice
Industry Professional

Posts: 5404
Location: New England
Joined: October 20, 2002
 Model it in WinISD 0.7 and you'll know.

 

RE: Port Size for Altec 612C, posted on June 18, 2024 at 04:59:03
Steelhead Mike
Audiophile

Posts: 112
Location: New England
Joined: September 2, 2000
 Thanks Bill.

 

RE: Port Size for Altec 612C, posted on June 18, 2024 at 07:22:22
rogerh113
Audiophile

Posts: 514
Location: San Francisco South Bay
Joined: October 20, 2014
 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, posted on June 30, 2024 at 23:56:33
GM
Audiophile

Posts: 595
Location: Georgia
Joined: April 26, 2000
 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.

 

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