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I couldn't find an existing appreciation thread so I felt compelled to make my own.  As a previous Crack owner I was very pleased when I decided to move up to the SEX amp.  The sound is easily up there with $1000 - $2000 amps, I found that I preferred my SEX 2.1 over the Balancing act when I was at a meet and able to A/B the two side by side.  It is also one of the more versatile amps in its ability to drive virtually every headphone using the impedance switches I can get it dialed in even more.  It also kicks ass with my bookshelf speakers and can drive my STAX headphones via the SRD-7.  I definitley think more people looking to go DIY should look into this amp.