Originally Posted by jmsaxon69
That X-Can v2 puts out 1 watt of Class A power
If there is a better reason for the lack of bass extension and weight I'd like to hear it, I'm all ears....
One other thing, I don't listen very loud, at least that's the impression I get after reading people talk about "concert levels"
I've been in the HiFi biz for 25 years and still can hear pretty well for a reason, I know when too loud is too loud....
Impedance mis-match, as has been mentioned, is probably what is wrecking havoc with the bass response right now. If the speaker's impedance is 35, and the amp-out is like, 33, the damping factor is about 1, which sucks bad. If you had headphones with an impedance of 300, the damping factor would rise to a still not great but much better 9.4.
People in this forum argue that a ratio of about 8 to 1 is the 'right' ratio to ensure that amp output impedance and headphone impedance are well matched. It is not all that surprising that the Annie's 'work better' with the X-Can, because they have twice the impedance and are more efficient as well. They would have about 'twice' the damping factor of the HE-400s, which must be an audible improvement given your comments. But given the 8 to 1 ratio, the X-Can amp would be ideally matched to headphones with an impedance of 256 or higher.
"1 watt of class A power" (at what impedance?) does not preclude good bass, in part because the amps output impedance would mean serious power drop-off as impedance goes up. More importantly, power does not = bass. It only = SPL or loudness. If the frequency response of the amp were total sh** - rolling off bass frequencies, then that would be a real instance of the amp impacting bass response. But flat out the amount of power is irrelevant in terms of sound quality. There are other more important factors.
My current headphone setup would provide a damping factor of maybe 50. In my car, about 40. The actual amp in the car has a damping factor rating of 500, but I am dividing the speaker impedance by the amp's output impedance to get a rough figure of 40.
My suggestion would be to try the HE-400 on a laptop, phone, iPod, stereo, etc. Anything but the X-Can, in other words, to see if you can get a better response. If you do, and you like the phones, IMHO you will need a different amp (with an output impedance of 2 or less) for best results.
Edited by MrMateoHead - 7/22/13 at 8:08am