Originally Posted by deadkenny64
Yes, I had the 10 Ohm and sent it in for the 1 Ohm mod. Much better control of the bass and seems to be more even in the FR from low to high. I'm using low ohm custom IEMs (UM Miracles) so I didn't want to color the sound at all. With higher Ohm headphones you probably wouldn't notice much difference.
I'm using some AKG 550 with my DACport. They are pretty easy to drive/sensitive, so I was at first having tracking errors at low volume levels (on the DACport).
I sent it in to Centrance and they replaced the volume pot and maybe made other adjustments (I let them know what cans I was using). Cost about a hundred bucks, but worth it.
The volume tracks better now. At low levels before, one channel cut out before the other. Now I have lots of range in the lower volumne levels. Also, the occasional crackle when changing the volume is far far less than before.
But since the AKG550 are about 60 ohms, the ideal resistance for a headphone amp would be below 6 ohms.... rather than the 10ohms that the standard DACport is rated at (to achieve the best damping factor). So the 1ohm mod is of interest to me.
1) Perhaps CENTRANCE made that mod when I sent it back, and that is why I have more range in the lower volume space already?
2) How much did CEntrance charge you for the 10ohm to 1ohm mod?