How much of a jump in quality would you say it is? Is it the proverbial ‘night and day’ some people like to use around here, or more subtle?
I wouldn't say its night and day no, but I found the R28 sound was a touch flat and also, with my Atticus it gave it a slightly tizzy upper end, which the M9 also fixed. The M9 has just a more powerful sound which gels really well with the ZMF headphones.
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