Astell & Kern has teamed up with Beyerdynamic to deliver the AK T5p 2nd Generation headphones, a pair of closed-back over-ear headphones based on Beyerdynamic’s T5p model.

Having undergone some tweaks aimed at delivering better sound, particularly when used with Astell & Kern portable music players, the new T5ps come with an upgraded price tag. Ultimately, we’re left a little unconvinced.
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https://www.whathifi.com/reviews/astell-and-kern-ak-t5p-2nd-generation