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can any one tell how this is for he4xx.. from power output rating of 1500 mV it seems perfect.
I can tell that the sound is very satisfying. I set my A30 amp on low gain and 9dB for my HE4XX and for most songs that I listen to the music gets loud when the knob reaches 3 o'clock.
Actually the low and high switches are not the gain and I have no idea what they do, because it sound the same whenever I switch them back and forth. Nevertheless, the sound is clean imo.
The High and Low is not a gain switch, A30 does have 9dB and 18dB gain on the 2nd switch. The 1st switch with High and Low is the supply voltage setting, you set it high for all your power hungry HP when using 1/4" plug, switch it to low for sensitive IEMs on 3.5mm.