I'm thinking of making a sub instead of buying one, and I'm on a very tight budget. I'm thinking $180 max. I found on the Madisound website the Swan 305 for $58, and the Eminence Eclipse 12" for $61 the specs are here I tried using WinISD, but I have no idea how. I was thinking of using a 250 watt amp since it would deliver about 180 watts to the Swan woofer which is only 8 ohms, and it can handle 200 watts. The Eclipse 12" is 6 ohms. I don't think I did it right, but here's a pic of my response curves for both woofers in a 5 cubic foot vented enclosure tuned to 23 hz with 125w of power. picture Can anyone offer any help? Thanks!!