Jacques_nasi wrote:
1. how much of a gamble is it to buy used monitors, is there much that can go wrong with them?
They are electronic and electromechanical devices, so yeah, they sometimes go wrong (My KRK V8s had a bad tweeter right out the box). I wouldn't buy without testing that they work (and work well - no distortion, no crackles, no loose sockets). Failing the chance to audition them, I'd probably only buy from someone I knew or a store, so there was recourse.
2. do I really need 6inch monitors instead of 5, my little room where they will be used is only 2m X 2m?
Not really, a square room that size is going to have severe modal problems in the low end anyway, so the higher cutoff point of a smaller speaker will work to your benefit (and I'd still recommend you bass trap every corner possible).
