WOW!
I don't want to hype my new amp, and I try to NOT encourage a new FOTM (D10 has been my favorite for 8 months). But my iBasso D4 arrived today and right out of the box it sounds probably as good as my 1000+ hour iBasso D10 with TLE2141 class-A/EL8201 topkit. I love it already. It's not identical but pretty darn close. I've only tried it with my Grado HF-2 so far, but I don't want to stop listening. I am quite surprised that iBasso keeps upping the ante with each new amp. I am running it off 5v only since I need to charge up a 9v for it.
I will start the mandatory 300 hours burn-in now for my review, but this is one amp that does not demand burn-in and can be enjoyed right away (unlike the D2 Viper/Boa or Predator). The D3 was better out of the box than the D2 Boa and just got better, the D10 was as good out of the box as the 700 hour D3 and just got better, and so it goes for the D4 as well I believe.
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