Thanks for the info. Will come in handy when I decide to build a 'real' box. For right now though, I think I am 'shooting blind'.The sub is a 10 year old 4ohm 12 incher that was overpriced when I bought itin Spain some 10 years ago For 40 Euros. There is no longer any info of that manufaturer or make and model on the internet. What I would really appreciate, is an educated guess basd on experience. I think the main challenge is porting a 1.4 cuft box for a 12" sub. So might a 2" port perform any better than a 3" and then what might be a half decent frequency to tune it to. I realy don't expect miracles.