So I guess the most headphones should work fine with it, at reasonable volume. On DT880s, the same file plays at around 93-94dB, which needs almost 0.5Vrms.
At 1KHz, the AKGs have around 66Ohm of impedance, so 90dB equals to ~0.2xVrms, and 98dB equals to 0.4xVrms. I measured the maximum SPL out of AKG K7XX using a 1KHz test tone at 0dBFS and found out that the SPL was around 98dB. On very quiet tracks eg classical recordings, AKG K7XXs are loud enough, but DT880s can be very slightly too quiet to my liking. It can push my 250-Ohm, 96dB/mW Beyers and 62-Ohm, 106dB/V AKG K7xx to at least 90dBSPL as (measured by an iOS app) at max power on average music that's not subject to stupid loudness compression, and I'm quite sure it can go a few dB louder on tracks with brick wall compression. Many sources on the net including this one say MBPs generally have 2Vrms max output. Speaking of power output, which is the most important for me.
(I personally believe the main culprit for distortion is output Z, this is what makes tube amp sounds warm, IMO.) It sounds pretty much like my transparent sources, say, sources with zero-ohm output impedance.
To my surprise, the overpriced laptop sounds darn good! No 'warm' distortion present as with the 10-Ohm Yulong DAART Canary.
HEADPHONE JACK NOT WORKING MACBOOK PRO 2012 PORTABLE
Today my stupid Chinese desktop DAC/Amp Yulong DAART Canary was dead with some serious hums and buzzes, so I was forced to use the laptop's phone out since my portable amp had run out of battery. It is the 2016 version of 13' screen with touch bar and 2.9GHz, Intel 6267U 'Skylake'. Well I owned the unit since Dec 2016 but never once used the phone jack.
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