Okay so I'm purchasing two Alpine type S woofer and I know of a local car audio place that sells boxes from Atrend tuned specifically to Alpine woofers, (at least the type E and S) the port is tuned to 35 Hz which is recommended by Alpine, just wondering if anyone has had any experience with this box. Alternatively I could have a box built that fits the woofers "optimal" specs though it still needs to fit in my small Cavalier trunk...