Im currently using the RE Enclosure calculator (http://www.reaudio.com/speaker_box/LPort_Box_Calc.html) and after putting in the dimensions I can fit in my trunk and Im playing around with port size and what not and I was curious, the "tech" section on the Fi site says the recommended tuning is 33hz, I can only get my box to fit if I tune it around 34hz, is this an issue? would it be better to be lower than ideal if you cant get the ideal 33hz like 32hz instead... Or am I not even gonna notice? Also, again refering to the "tech" section, for the 10s it recommends 15 square inches of vent per cubic foot of air space, is it a major issue if I can only work around 12 square inches? Specs for the box for two 10in Fi Bls Air space after woofer displacement: 2.475 Cubic Ft Square Port Area: 31.25 Tuned Frequency: 33.79hz Good enough? Also side question, is there any disadvantage to having it built with the universal option as opposed to not?