As some of you know, I have been a big fan of the E5 for a long time. And I believe the E5 and ASG 2.5 is an amazing combination; although my custom UE 11 pro IEM's do sound a little better. I love it even more now that I am using it hooked up to my car stereo. I have tried cd's, and every other player, phone, and amp that I own; and the E5 sounds better than all of them hands down in my truck. It has the same huge tight bass, and all the great soundstage. I run the onkyo X1 with 1 200GB card for Spotify, and 1 200 GB card with my CD collection, to the E5 and then to the car amps. And I control the E5's EQ through the X1 since it has the Bluetooth option, or I can control it from my phone via Bluetooth. I found the sound is better by connecting everything with IC cables than using Bluetooth so far. There is absolutely no need to spend thousands of dollars on a car stereo deck when you can use a phone or player and an E5.
And again I am still blown away by the E5 and ASG 2.5 combo. I was listening to some older music the other day and I heard some things I never heard in that music before. And the bass is just huge, clean, and tight.
So the E5 is the best personal amp for IEM's of the dozen or so I tried; and it is amazing playing videos, movies, gaming, and now great in your car. I am buying another one soon.