New addition to the stable.
I made the decision to take advantage of the $600. price on the HiFiMan Arya Stealth, here pictured with the Meze 109 Pro. I think 2025 is going to be a really uneventful year so far as new purchases. I've also upgraded my Fiio BTR7 to the newly released BTR17 and I purchased the Earmen stack which consists of Amplifier, Linear PS, DAC & Streamer.
Dec 19, 2024
It's worth knowing that most people who buy the O2 usually continue on to purchase other amplifiers because while it's great to have a flat reference while you're getting started, as you go further down the rabbit hole, you'll probably want other amps because they have different sonic characteristics.
When I'm explaining these things, I usually tell people to think about headphone audio as a three part equation. Source + Amp + Headphones = Sound. By using an O2, you basically take the amp out of the equation, letting you more easily compare headphones and sources (something most people want to do getting started).
Over time listening to several headphones and IEMs with the D1, I don't feel as if I couldn't trust the D1 to be transparent. There's a general rule that the impedance of the headphone should be at least 8 times that of the output impedance of the amp driving it. Any less and there may not be enough electrical damping for controlling the headphone. The output impedance of the D1 is 10 Ohms, which means my headphones/IEMs with impedance of 16-50 Ohm are probably being colored by the D1.
I don't know how significant the effect is, so this is why I am so interested in getting the O2. Or in other words, it's just my lame excuse to buy another toy.
If you're interested in learning more, I highly recommend reading NwAvGuy's blog post regard headphone and amp impedance here: http://nwavguy.blogspot.com/2011/02/headphone-amp-impedance.html