Alright, so I finally got a replacement unit from Centrecom this Wednesday and also got the time to test it tonight for the first time (been busy with exam studies) and WOW...I am SO HAPPY!
The imbalance problem at low volume is not there anymore with this replacement unit. I have tested it with 2 of my low impedance headphones (Noontec Zoro and Klipsch x7i) and both of them have NO imbalance problem. The sound is still extremely high at low volume but not imbalance. For some reason I also noticed that the volume knob is a bit TIGHTER to turn on this unit compared to the other one (could be just my placebo though).
The thing I am really annoyed about the E1 is that the built quality is not very good (not 100% perfect). For those who have read my earlier posts here should know that the reason that I returned my first unit was because there were scratches on the front panel when I first opened the box. I was looking around this new unit tonight and the first thing I noticed was that the power button was not straight but slightly bent towards the top and there is also a dot scratch on the back of the unit too!!!
Oh well, I guess I can live with these tinny imperfections since they sound quite awesome to my ears.
Now the next thing to do is to put my 6 Muses01 into the unit after my exams. I want to listen to these stock op amps for a bit first so I can compare them to the Muses01 (they came this week too)!
I will post a link where I got the Muses01 from after I have installed them and make sure they work 100%. They are so much CHEAPER than anywhere else I can find!!!