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well, do you know the purpose of buying studio monitors/headphones for mixing/mastering audio? most consumer speakers/headphones maybe add a little treble, subtract a little bass, or what have you, in an attempt to create the best quality sound for your current audio. However, even though this may be an improvement (high quality bose vs cheap ass target brand shit), it distorts the sound. studio monitors give you (hopefully, if they're good quality) the truest reproduction of the sound without anything really added to it. So as where good speakers/headphones make their own additions for added sound quality, studio monitors subtract virtually everything and just give you the raw sound. if you mixed/mastered on headphones/regular computer speakers, you might get it to sound great on your personal gear, but you go to play it through your car, or your friend's stereo, and it might sound like shit because you mastered the audio on a distorted channel. same with your amplifier, i'm thinking. you've perfected (or whatever) your tone through your distorted headphones, but they're jsut that; distorted. to acheive the same tone, try and work the the knobs without phones. at least memorize how to get good tone just from your speaker, so that way when you ahve to perform, you know how to make your guitar sound good, even if you have to practice with phones in (i know how this is

).