The MP3's are the same and coming out of the same speaker(Bose L1). I can't tell what effects, if any, are added but it processes the loaded MP3 somehow.

In general,is the source of MP3 playback critical as long as good speakers are used ?
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact