Originally Posted by Clincher09
As for sources, I'm currently just using a Zune or my Galaxy S2, but I have a Pioneer receiver I'm going to start using once I move into my new house.
I've tried the PA2V2 and wasn't really impressed with it.
I would assume the Pioneer's headphone jack has a high impedance, so plugging the AH-D2000 straight into the Pioneer may not make a good combo, but plugging an external headphone amplifier into the Pioneer should be fine
I guess for around $100, there is the Schiit Magni ($99) headphone amplifier.
But my brain thinks that if you think the Fiio E11 is not driving the AH-D2000 well enough, then I doubt any other amplifier is going to make a difference.
The my Fiio E11 can easily drive my 300-Ohm headphones and the AH-D2000 are only 25-Ohms.
So the E11 provides way more power then the AH-D2000 could ever use.
There is the Little DOT 1+, which I believe is designed to work with low impedance (Ohm) headphones,
It might deliver power in just the right way that might "Wake Up" the Denon AH-D2000.
Might think about selling off the Zune and Fiio E11 and putting all cash towards a nice DAP (with a good built in DAC), like the Fiio X3 or iBrasso DX50, or even one of the Cowon models.
Might try asking about amplifiers for the AD-D2000 on this thread.
Could also just read the whole thread.