the sound of the upa 1's midrange was VERY forward in the presentation to start with. the bass was hardly existent. now after leaving the amps on for 32 hours the midrange is taking it's proper place and the bass is starting to thump. anybody who orders these and experiences this , don't worry this is normal. i'm thinking that after 48 hours i should get close to the sound i'll end up with with these. merry christmas all. john