super dynamic
Pros: dynamics, drive, prace/rhythm/timing
Cons: bit "grayed out" in emotional tone and timbral color
So far I have used this amp with two different headphones: the Hifiman HE5LE, and the AKG K601. I'll start with describing how it sounds with the AKG K601. First, let me note that one absolutely must put a 120 ohm series resistor at the output in order to be compatible with the K601. AKG specifies that the K601 should be driven by amp following the IEC standard, which is 120 ohms output impedance. And I can say that without that resistor, the highs are harsh and fatiguing. With that resistor, the sound is balanced. The most outstanding feature of the EF5 is its dynamic power. Let me explain what that means. It does not mean simply that the amp gets loud. It...
(read more)