Headphones used: MEElectronics M6 Pro, Sony MDR-ZX300
 
Sources used: iBasso DX50 (various MP3's and FLAC files), Galaxy Note 4 (Pandora)
 
Amps used: FiiO E11k
 
Granted I only had the unit for a few days on the Aune X1S review tour, in those few days I could tell this DAC/amp was a great value.
 
The first day, I plugged my DX50 in through the coaxial output and into the Aune X1S. I first used my M6 Pro's and just sat back and listened. The wow factor isn't there right away, but the more and more you listen through the X1S the more you notice how great it is. Clarity of the music was the first thing I noticed after listening for a while. The X1S really made me value my DX50 more after listening for just a few hours. I would always read reviews on how great the DX50 sounds and now I actually know.
 
The amount of volume adjustment you have on this thing is great. The volume knob has such a great range that you can really get into the right sound level for whatever you're listening to. Not to mention the number of inputs you have to choose from, there is no way you should not be able to get the best out of your music collection from the X1S.
 
I then used my Galaxy Note 4 and my Sony's to see how the X1S does with lesser sources and headphones. It did not disappoint. After a few hours of listening, this DAC really showed what it can do, even with lesser quality components. Streaming through Pandora sounded more detailed and open. I used the E11k just as a reference point since I've used that amp with my Sony quite often. The X1S does a good job of amping but it's definitely on the bright side. The E11k helps in the low end, especially with the bass boost on and gain switch to high.
 
Overall, I would definitely recommend this to anyone looking for a desktop amp. It has the best value from what I can tell; numerous options for inputs, great sound quality, and broad range of volume adjustment.
 

As my first universal IEM, I did a lot of research before purchasing the MEElectronics M6 Pro. After a few months of ownership, I am very glad to have purchased them as they have been a great IEM to listen to. Almost any review I read had said these headphones were a great bargain for the price, and they were RIGHT.
 
The amount of accessories alone that you get with these IEMs make this a great value. The extra set of cables, one with a volume slider and mute button for smart phones and one normal; the various sizes of tips including one pair of comply foam tips; and most importantly, the hard case, yes a HARD case that can fit both your DAP, the extra cables, and extra tips easily.
 
With the 7 different pairs of tips to choose from, you're almost guaranteed to find a great seal with the M6 Pro's. I thought I would always be using the comply foam tips but I got curious one day and tried a few of them. The 7 different pairs are split up into 2 pairs of triple flange tips (small and large), 1 pair of medium sized double flange tips, and then 3 pairs of single flange tips (small, medium, and large sizes), and of course, the comply foam tips. The medium single flange tips fit me the best, as well as the double flange and the large triple flange tips. All provide a very good seal but it is very much so dependent upon the size of your ear canals, hence the number of different sizes provided.
 
Overall, the sound of the M6 Pro's is great, they cover a good range of lows, mids, and highs. I would definitely not describe them as sharp or bright but warm and soothing as far as sound signature is concerned. I listen to quite a bit of R&B/Soul, Jazz, and what not and have found that the bass on these is pretty prominent. It's definitely not overpowering by any means but has good punch to it.
 
Vocals sound great, clear but somewhat drowned out every now and then by the bass. Instrument separation is pretty good. The more I listen to the same album with these the more I notice things I didn't the first time around.
 
I've used these while mowing the lawn quite a bit and the isolation on them is great, especially with the comply foam tips. I can hear the mower running but can hear the music over the mower more so.
 
All around a great universal IEM, perfect for somebody looking for something better than their Apple Earbuds but not willing to spend over $100. 

I was contemplating buying this or the Fiio X3. I didn't like the size of the X3 or the button layout and the other reviews on the DX50 were just too good for me not to pick it.
 
I bought mine used from a member on here, he included a 32gb microSD card with his music collection on it (thanks trojan2900). Right away I fired it up, picked a random song, and started listening and couldn't have enjoyed it more. The sound quality was amazing, a very warm, soothing sound, good through the highs and the lows, even through the cheap earbuds I was listening through.
 
With the built-in amp there isn't exactly a need for a separate amp, but depending on your headphones you can definitely benefit from one.
 
The user-interface is a little bare, Rockbox can help here but it is a little tricky getting everything figured out and working properly.
 
Overall a great DAP for anyone looking to get into the hi-fi world or as a dedicated, everyday player.
 
Edit: After owning the DX50 for a few months now, I love it. It is everything I wanted in a DAP. The more I use it the more I realize the stock Mango software is actually better in some ways than Rockbox. I just couldn't find a theme I liked from Rockbox that fit well with the DX50. Also, being able to create a playlist is something I never figured out how to manage with Rockbox (if it's even possible) and enjoy having that function with Mango.
 
Up until now, I always thought the DX50 sounded best with the gain switch on "medium", I switched it to "high" a few weeks ago and I haven't switched it back. I've really only been listening through my M6 Pro's but they sound so much better. I'm waiting on the OPPO PM-3 loaner set to come my way so I can decide between those, Hifiman HE-400, or AKG K545.
 
In just the past couple of days, I have used the DX50 with the Aune X1S review program and I must say that DAC is great. Clarity, refinement, and overall better sound signature are just some of the ways I can describe what the X1S does. I wish I could keep it but if I ever need a desktop amp, I am definitely leaning towards the X1S.
 

 

As my first review, bear with me. My previous headphone experience only includes earbuds that came with any smartphone I purchased and Bose Tri-port headphones.
 
These are my first Sony headphones and I knew right away that these were going to need an amp to sound good at all, which is true but they are definitely lacking bass. I wore these on an airplane thinking with the amp they would be fine, I heard more airplane nose than anything. The isolation on these is terrible, and turning up the volume in any sort of noisy environment only brings out the highs and hurts your ears.
 
At home or in the office with no other noise around you, they're completely fine, but this is where the comfort factor comes in to play. After a session of listening to them the pads really start to flatten down, which gets to be very uncomfortable. For short, quick listening sessions those these will work fine with an amp.
 
For the price, they're not bad, but considering the comfort factor and the need for an amp, I wouldn't buy these again.