Console controllers that offer a headphone jack do not exactly have a powerhouse amp onboard, and that’s just fine with the H3. You don’t need to understand headphone terminology to know that a bigger number is better when talking sensitivity, and here we have 125 dB at 1 volt. That’s high, and, coupled with the low 20 Ω impedance that means these don’t take much power to get loud. Perfect for low-power headphone amps like the one found in a game controller.
To sum up, these have excellent clarity, good bass, and a slightly “scooped” sound (think loudness control) that reduces midrange and emphasizes lows and highs a bit – a sound that many people prefer.
As to the microphone, I certainly wouldn’t characterize this as “studio grade”, but it’s just fine for a headset mic. It doesn’t offer any appreciable bass, though clarity is quite good. I noted that it was easy to overload it, so keep it a bit farther from your mouth. Background noise rejection was pretty minimal, but this would still be fine for chat (and the lack of bass actually helps – low frequency sounds just aren’t picked up at all).