So, I received AMP16 a few days ago, well, it was on Thursday, had it on burn-in (over 100hrs now) while switching the playback between solid-state Class
AB and dual Raytheon
Tubes output modes, and am now starting to listen to it. Just spent a few hours with it. First impressions are very positive. This new amp card is like getting 2 DAPs in one because you get two distinct sound tunings in one card. Relative to IEMs I tested it with, I hear AB output delivers a more powerful, more resolving, more dynamic, faster, punchier sound. On the other hand, Tubes give you a softer and laidback presentation of the sound with more rounded bass, and sweeter textured mids, while the treble remains crisp and detailed, similar to AB treble. From the spec, AB BAL output is 6Vrms (in high gain) while Tubes BAL output is 4.6Vrms (HG), so when switching from AB to Tubes, you do need to raise the volume to match the output level.
With DC-in connected and Super Gain boost on, the mid-bass sounds tighter, more articulate, with faster attack, and shorter decay (better control of bass notes), while the background is blacker, and the perception of the soundstage width expands as well. The improvement with DC-in is similar to how it was with AMP15, except that to my ears, I think I even prefer AMP16 AB over AMP15. Again, this is based on short listening time, but to my ears, AMP16 has a wider soundstage expansion and a more noticeable mid-bass punch in comparison to AMP15, which has more sub-bass rumble and a softer mid-bass punch. AMP16 AB sound is faster, punchier, and more dynamic in comparison to AMP15.
You do need to keep in mind, AMP16 is PO only, doesn’t have LO. Another thing I noticed, you need to restart the DX340 after exchanging the cards; otherwise, the new card is not recognized. Not a big deal, just need to keep in mind this is not plug’n’play. Btw, make sure you run the OTA fw update since you need the latest release to recognize AMP16. Also, with very sensitive iems, lowering the amplifier gain helps to reduce background hissing, but that is expected as well. I tapped a few times on the DAP chassis while in Tubes, and didn’t hear any ringing.
Overall, I’m quite impressed with AMP16, it makes a great addition to DX340