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Added on June 3, 2008, 4:22 pmhai , recently i bought a Edifier M3300 from ALL IT hypermarket..i was pleased with it performance.. but it is already 1 week , and today i found out that the bass performance  is getting weak, not functioning properly..first , i can listen the difference today and yesterday bass... yesterday bass is stronger a lot.. to ensure this , i put my hands near the holes of sub woofer about 1cm...it blow the air out softly ...normally , when i set the window volume 60%, player 100% , and the edifier master volume 50%, bass max .. i already can felt the air blow out strong even i put my hand 7cm apart from it... beside i test with my hand , i also test with paper... on the first day , i put a receipt near the holes about 1cm and it vibrated fiercely,.. but today , a same setting , even i set the max volume and bass setting.. it blow air softly and can barely vibrate the receipt but not fiercely ...guys , any idea how can i ensure my sub-woofer is working alright ? i still got 1 year warranty... help me pls...thank

If budget allow, give S550 a try