well, i did found the right one it was A how ever there are few factors in play here. like type or audio you play (there audio Hz ranges in the audio) this test was only voice, that is the middle range of the audio audit able spectrum; since no speakers had much of an issue getting the middle frequinces out. anyway low compress of audio even at 24Kbps ranges will not see much of a deference when played on a normal set of speakers since those speakers it self don’t play the full range of the audio spectrum. also the type a encoders/decoders you use will also make a deference. its like getting a $50 CD player with a $1000 CD Player most of us cant even say witch is witch by listing to it. even at HiFi systems. most of the time MP3 128 is CD quality level, meaning most of the audios do not get lost. but if you get a 48K file with a 128K file, you will see a notisable deference in the High Frequinces.

HEHE sorry about the English comment, 2 lazy to switch on the other computer.