Yeah I mean it does have enough volume level if that's what you mean. Just my experience with what I thought was a pretty standard set of headphones the Beyerdynamic TYGR300R, which I mistakenly thought was 96dB/mW (according to official spec) but google shows me DIYAudioheaven spec is 93dB/mW (I assume this was measured?).
I get enough volume but with the Beyerdynamic I am running the A55 (factory firmware) with custom EQ at 80~86/120 volume and I don't consider myself to listen particularly loud, just pretty average I listening level I think. So it works perfectly fine, I just feel like I am wringing the output on the A55 (not too much left for headroom?).
Edit: I also should mention I am not using the dynamic normalizer, or any kind of gain corrections on files. So there is should be no reduction in gain from that aspect.