I have the HA-2SE. It's line-out output is twice below the standard (usually it's 2 Vrms, not 1 Vrms). Whatever amp I plug it to I need to crank up the volume or use high gain. Have you tried high gain on your Magni 3? I don't have Magni 3 but I have Magni 2 Uber. Whatever other DACs I used with my Magni I used low gain with my headphones. With the HA-2SE I had to use high gain for comfortable listening with everything else being equal. This could be part of your problem.I am feeding the Magni with the line out signal from the Oppo which is supposed to be 1 Vrms.
EDIT: I remember reading a review (could not find it quickly) where the reviewer claimed that HA-2SE's phone-out sounded better and more powerful than line-out when connected to an amp. You may want to try that.
Are you using the line-out port, not speaker's?I tried feeding the Magni with the output from my PC's sound card and if I set the volume on the PC to 100% (on Windows and on the music app) I get a little better output but not enough to take the amp to the right levels.
Last edited: