Thing is, the E17 (a portable amp) could drive the DT990/600 about as loud as the SA-31 off those portables. It doesn't make any sense.
The 990 does get ear shatteringly loud when using the Mixamp to SA-31 or ODAC to SA-31 (albeit at just over the SA31's max volume on high gain). I distinctly remember the HE-4 needing a crapton more than anything else I've driven, even off the Lyr (though with plenty of headroom). This scares me. If the SA-31 needs to be nearly maxed to be at a loud volume.... I'm definitely not going to be happy. I expect this amp to have as much, if not more headroom than the Lyr. I'm beginning to think I chose the wrong amp.
As reported By clemmaster the fact is that some DAP , have a weak line out , E17 is a portable amp optimised to be used with such kind of device , for SA-31 seams that not . Regular Line Out are about 2.0V ... Some amp input are less or more sensitive . I experienced that too , with some weak DAP player i have to crank out the volume much more , but depending on wich DAP , Wich Amp it can offer very different results .
And DT-990-600 ohms and HE-4 don't have the same electrical requirement , wait for HE-4 for a final statement ^^
Edited by HaVoC-28 - 10/27/12 at 7:28am