sorry for the screwed thread title! can't change it. so there's my question: i want to bulid an extension cab for my GK MB150. i want it to be quite compact, low budget but good quality. the GK obviously lacks lows in the longer range, so it will have to be a fair bit bigger than the GK. i was thinking about the size of a SWR WM10 cab but wider, then put on it's side. the result would be a rather high cab, a tad wider than the GK and way deeper. my questions: sealed vs. ported? my intuition says sealed. speaker? it'll have to be a single speaker or two cheap ones. cost is an issue. i was thinking 1x10, 2x10 or 1x12. leaning towards 1x12. i will use it for DB on bigger stages and in th elong run for GB (6 string) in medium loud settings. from the eminence range, which 12 ist the best buy? i can ie get a beta 12 for 55 euros. it seems to have a good Xmax. i don't need extreme power handling, it will only have to cope with 100 watts or so from the GK. will a beta 12 in a sealed box sound good? are there as cheap or cheaper speakers i should take into consideration?