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RHA T20 review:http://www.head-fi.org/products/rha-t20/reviews/14056
my synopsis thread:http://www.head-fi.org/t/781655/rhas-flagships-rha-t20-i-vs-t10-i-with-comparisons
RHA T10i review: http://www.head-fi.org/products/rha-t10i/reviews/14057
RHA T20 vs T10 comparison: https://www.youtube.com/watch?v=K1NZC2pSt58
Various informational links:
http://www.rha-audio.com/uk/headphones/t20.html
http://www.rha-audio.com/uk/headphones/t20i.html
http://www.head-fi.org/t/765549/rha-t20-in-ear-headphone-featuring-dualcoil-driver-technology
source