I have an older JL 12w1 and lack the time and tools to build a box right now. JL recomends a 1.5 cu ft enclosure. All the prefabs I find are from 1.25 or 1.7. Which of these should I spring for? Is it better to be undersized or oversized. What would be the differences in SQ? This is not a high power precision system just needing some clean thump for accent.