When the volume is set quite high (near max setting of the phone, definitely unhealthy for long-term use), it doesn't hold a candle to the Topping DX3 Pro v1[0] I use on my desktop. Important: I don't recommend the v2[1] that's currently on sale, as the measurements aren't anywhere as good. They did destroy the product with the amp redesign they did to get around a high early failure rate hardware problem on the v1 that they were never able to debug. I would suggest the JDS Atom + Atom DAC set or the Topping DX7 Pro instead, cheap (yet powerful well measuring) and expensive (but balanced and ridiculously well measuring) respectively. Or a Schiit Hel for a very portable usb-powered solution for the laptop backpack that also has mic input.
But at lowish volumes (used most of the time, don't destroy your ears!) then yes, phones tend to have reasonable headphone amps in them. With decent power output and lowish output impedance. Unlike most computer motherboards, which have excessive output impedance and out power is so low I'd call anemic, when not flawed in other ways (noise due to poor isolation, or non-flat frequency reproduction due to shit implementations of aliasing filters).
I mostly connect the headphones to the phone to play rhythm games like Love Live sif, allstars or idolm@ster deresute, mirishita. My phone (chinese and a few years old) does very successfully drive the HD600 to a pleasant output while playing these games.
As an aside, I absolutely recommend Sennheiser HD600 to anyone who wants a durable (plus tool-free modular with good availability of parts, and compatibility with HD580/58x/650(aka 6xx),660S parts, thus effectively forever) all-rounder open back headphone with a focus on accuracy that's cost efficient and extremely comfortable. Plus they've been around for a good two decades, thus there's no shortage of reviews to base a purchase decision on.
But at lowish volumes (used most of the time, don't destroy your ears!) then yes, phones tend to have reasonable headphone amps in them. With decent power output and lowish output impedance. Unlike most computer motherboards, which have excessive output impedance and out power is so low I'd call anemic, when not flawed in other ways (noise due to poor isolation, or non-flat frequency reproduction due to shit implementations of aliasing filters).
I mostly connect the headphones to the phone to play rhythm games like Love Live sif, allstars or idolm@ster deresute, mirishita. My phone (chinese and a few years old) does very successfully drive the HD600 to a pleasant output while playing these games.
As an aside, I absolutely recommend Sennheiser HD600 to anyone who wants a durable (plus tool-free modular with good availability of parts, and compatibility with HD580/58x/650(aka 6xx),660S parts, thus effectively forever) all-rounder open back headphone with a focus on accuracy that's cost efficient and extremely comfortable. Plus they've been around for a good two decades, thus there's no shortage of reviews to base a purchase decision on.
[0]: https://www.audiosciencereview.com/forum/index.php?threads/r...
[1]: https://www.audiosciencereview.com/forum/index.php?threads/m...