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Seeking advice. I am looking at these two amps to pair with my Sony MDR-1R's. At first didn't think I would use amp with the MDR-1R's, but after auditioning the Slim it really opened up the sound and made the lows sound tighter and the highs more alive. I know where I can get my hands on the TTVJ Slim, but I've also heard good things about the Rx MKII, but have not had the opportunity to listen. Can anyone give some insight, comparison, opinion as to which one may be better and why?