Originally Posted by andygiddings
Hi, been reading quite a few of the pages from this thread but cannot find a direct answer to my questions so here goes:
1) I'd like to use the AK-100 with my existing IEMs from Phonak - the PFE232. Anyone see any issues with these as I'm a bit concerned about the comments related to the AK's impedance output
2) Has Gapless playback now been fixed in the latest firmware?
thanks for your help
I haven't heard the PFE232 with the AK100, but I did a lot of testing and research with multiple IEMs when I had the stock AK100 so I am confident in the following.
The PFE232 is nominally a 40ohm earphone, but has a steep drop down starting at 2000Hz to a low of 15ohm (at 9000Hz) http://www.innerfidelity.com/content/phonak-audeo-pfe-232-measurements
What this means with the AK100 is that the response will be true to the earphone design from the bottom end up to about 2000Hz and will then have a 4dB dip starting at 2000Hz, and bottoming out at 9000Hz, before coming back up nearly to normal by 12kHz (the top of the 232's range).
Given that the PFE232 has a spike at around 8-9kHz, the interaction with the AK100 should actually smooth out this peak and may make the earphone sound more linear, but it might also take away sparkle and air from the sound signature depending on your tastes, etc.
My guess from all this is that the PFE232 will sound warmer (darker, smoother, etc.) when paired with the AK100.
Hope this helps (and proves accurate)
Edited by Loquah - 8/12/13 at 4:18pm