square port questons...

[stickytak]

I have 1 5x5 square port tuned to about 35 Hz, however I realized that I need 4xmore port area for it to be "correct". (roughly 100 sq in. neeeded) So can I just make 3 more of these same ports and have it be ok, still tunred to 35 Hz, or does that effect the Hz?

[Cabin_Pressure]

PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

[stickytak]

That dosnt help me, I need to know If I add moreports, what It will do to the frequency and sound output (SQ/SPL)