Originally Posted by sbulack 
Here is how I would describe the SQ differences between the AMP3-Pro.1 and the AMP3-Pro.2:
1) The Pro.2 provides a milder, warmer overall sound - as though a layer of high-frequency glare had been removed from the sound of the Pro.1, which permits better hearing into the depths of the music. In this transition, none of what I would call the AMP3's "live" or "fresh" sound is lost.
2) The Pro.2 provides a more 3-D sound, related to the easier hearing into the depths and lower-level details of the music. In those details (which take on a warmer hue) are found additional spatial information as well.
3) The soundstaging of the Pro.2 is different than the Pro.1:
a) The listener is closer to the musical voices using the Pro.2 than with the Pro.1. It's a noticeably more close-up and intimate listening experience with the Pro.2.
b) The overall sonic space in which the listener and all of the musical voices are located together is more spacious - as if the walls and ceiling of this "virtual venue" had been pushed out farther.
I've used a few tracks in which there are a good combination of musical voices and events in the low frequencies, the midrange, and the upper frequencies. Using the Pro.2, the voices and events in the upper frequencies are less prominent than they are using the Pro.1 - not weak, by any means. To my ear and taste, I would call their level of prominence on the Pro.2 more balanced.
Overall, how do these differences affect my listening experience?
They make for a more relaxing listening experience, yet one in which nothing is missing, relative to the Pro.1 - in fact, more detail is readily discernible (it's interesting that it takes on a warmer hue - normally colder, more high-frequency component is thought to be associated with more detail). A warmer, milder sound, with more intimacy with the musical voices and a greater sense of spaciousness - all enhance my enjoyment of everything I listen to using the AMP3. Yesterday, I was using the Pro.1 exclusively while recharging the Pro.2. I very much enjoyed my listening using the Pro.1 as I very much have for the six or so weeks that I have owned it. AND, when the Pro.2 was done recharging, I gladly switched to using it, and enjoyed my listening a noticeable and appreciated measure more.
I have some binaural recordings of rain that I purchased from whitenoisemp3s.com. These actually sound noticeably better to me using the Pro.1. The sound of water flowing and splish-sploshing sounds appreciably more convincingly real to me using the Pro.1 than using the Pro.2. For pretty much everything else that I have listened to since Friday, when the Pro.2 arrived, I have a visceral and natural preference for how the Pro.2 portrays it. My listening has been done using my favorite AMP3 phones: either the PAA-1 or Sennheiser MX500 or MX660 earbuds.
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