Good to know I'm not the only one to notice this. I fear for the man and phones that use this bad boy on 9... Although I suppose that'd be for harder to drive cans.
Yes, the impedence of the headphones will make all the difference to how far you need to turn up the volume. I have the original X3 and with my 32 ohm headphones I have it at around 100. That is pretty loud. I once tried a 16 ohm pair of IEMs and I had to turn it down to below 70 to make it sound like it was the same volume.
If you had the Q1 with 250 ohm headphones, you would need to have it way past 2 on the dial as well as being on high gain. I have the original E10 and E11 and they both have volume dials. I always have them both on high gain as I prefer the volume dial to be more sensitive. When using the amps with my PC, I hardly ever have to go past 3 on the dial on either of them.
Something that I notice about the line out on my X3 though is that it is so loud! It is hard to go past 2 on the dial of my E11 with most of my music on my X3. I assume the newer FiiO players will also have a pretty loud line out too. I am just wondering how this Q1 would compare to my E11.
if I was to get it, I would want a similar level of bas boost but from what some people have said here, it doesn't look to make a great deal of difference.
My AT ATH-AD700s are very bass light so they need a fair quantity of bass boost before it makes a very noticeable difference. This looks much nicer than my E11 and the build quality and the design would suit me very well too. The ports are just where I would need them to be if I wanted to strap it to my X3.
Edit:
I should have also read your previous post. I also have a similar problem with one channel cutting out before the other on both of my amplifiers with dials.
On my E10, when it is on 0.5, the right channel cuts of before let left. On my E11, the left channel cuts out before the right when its dial is at 1.5. On both of these amplifiers, these volumes are extremely low so it isn't a problem for me. It can be more of a problem the louder the input is. If the input is very quiet, it would require you to turn the dial further which would solve the problem. It can be a little bit irritating at times but from my experience, it is a pretty normal thing to happen with amplifiers with dials.