I'm using this headphones with a NAD 3225PE in very good condition, connected directly to the speakers output using the hifiman box, and a Sony QS cdp740. I've compared with a Beyerdynamic T1 coonected to a Teac DAC UDH01 and Opera Cyber Consonance headphones amplifier with Valvo-Siemens tubes and ECC82 Raytheon (And also directly to the DAC). The ampli NAD is with 8ohm speakers, soft clipping off (with opposite setting it distorts at medium volume)
On low medium volume there's no match. Hifiman wins for transparency, micro details, neutrality, effortless dynamic and sub bass extension, sense of air...
On high volume they match on details on the mids, I guess because the hifiman loose something. Beyer T1 has also a better central soundstage and coeherence in the soundstage. But Hifiman has better lateral and depth soundstage, better micro dynamic and low level details, sub bass and generally bass that you feel like real. And all that using just a NAD 3225PE. In the next days I'm going to try it with a modded Aereo Space Tube amplifier.
This headphones, with the NAD amplifer only, is a must deal, I can't use any other
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