my new 604 cabinets I'm building.

[cradeldorf]

You need to be exact with the numbers to be accurate with the results. I think you said 12.44 cubic feet in an earlier post.But from that .jpg looks like you put in 12 cubic ft.IIRC you have 2 different 604's that you had GPA recone correct ? If so what did they recone them as 604 g,h, ???

He came up with the 41 Hz from your port dimensions I think.You may need to add length to the port to lower it some. 25-30 Hz port tuning is more in line for HiFi/HT I think GM was getting at.

Thank's AB I calculated my box dimensions then deducted what I calculated for all the braces plus 432 CuIn (.25 CuFt) for the speaker displacement and came up with a grand total of 12.184 CuFt of volume. so now I'll recalculate the box frequency using those numbers.

I would be more inclined to change the size of the port per GM's recommendations as opposed to lengthening it.

I'm mulling over filling all the voids between the braces with 2" egg crate foam. I hope the 2" is the total height of the foam plus the eggs and not just the foam itself.

With those dimensions I come up with a box freq of 29.3448, there seems to be a conflict because Altec list's the cone freq. at 25 where T/s parameters put it at 27.1...... : /