You're welcome!

'Senior moments' at 50?! That's awfully young based strictly on my observations.

Hmm, you posted that this is a three layer 3/4" construction, so the vent length will be 2.25".

I don't see how you came up with a 168.3"^2 vent, but it's way too big plus in a simple reflex as your cabs are, Av = Sd or ~122.72" is the largest/optimum that should be used.

This, and all other on-line calculators I've tried calculate too long a vent [~70%! for this one], so as a general rule I prefer folks not use them if other than a closed vehicle or small room app where there's going to be some decent amount of room gain.

Some math that calculates an almost identical value to mine is in one of WP's PiAlign docs: http://www.google.com/url?sa=t&rct=j...MUbS-b8YN7Mt5w

Load them into Excel or similar, input this alignment and you're good to go if it calcs a Fre [Hz] = 53.681:

Vb [ft^3] = 8.8
Lp [in] = 2.25
Dp [in] = 12.5

GM

[table]
[TR]
[/TR]
[TR]
[/TR]
[TR]
[/TR]
[TR]
[/TR]
[TR]
[/TR]
[TR]
[/TR]
[TR]
[/TR]
[TR]
[/TR]
[/table]