Koss Pro/4XL vs. Pro/4AAA

Lebowski77

New Member
Hi there, wondering if anyone can give me some advice. I have someone offering to sell me Koss Pro/4X but cannot find anything really substantial. Are the Pro/4x's good headphones? I have seen good things from the Pro/4AAA version. I do listen to a lot of music with good bass so I am wondering what the difference between these headphones are? Thanks for any help/advice!
 
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