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I didn't buy my NX1s from Massdrop as lets be honest, you can get it at lower price with cheaper shipping if you look around.

Anyways, personal impression after using it for a few months, it's a beast. It doesn't sound really good when paired with a pair of hybrid IEMs like the Fender FXA7 or the Aurisonics ASG 2.0. Things will sound a bit lack lusting without the bass boost turned on and the soundstage seemed to be more compressed than without the NX1s (just a bit). However the improvement with the NX1s with IEMs and without is very noticeable still and it's not bad. And same goes with Dynamic Drivers only IEMs like the SE215 SE (blue) and the Audio Technica IM-50.

Interestingly, when paired with a pair of pure Amateur Divers IEMs like my friend's UM Pro 30, the difference is very significant. The NX1s is capable of bringing out more bass from the Pro 30, making it more balance sounding. And believe it or not, though it does not bring out the full potential, the NX1s is capable of powering and bring out more details from the monstrous SE846 without turning on high gain - at least much, much better than direct output from an iPhone in comparison.

As a whole, considering the low price and it coming in such small form factor, the NX1s is nice deal for me as I was looking for a portable amp to go with my iPhone. Battery life is also nice as I can go on for at least three to four days before plugging it into charge. (I typically listen to music for at least 3-4 hours per day and often forget to turn it off and kept it on without playing any music for an hour or two.)

Just some personal opinion to try and help out anyone considering this. Hope this helps! :)
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Yes I think so, for instance the SE846 I tried the past weekend gave me the exact feeling that low-gain is underpowering it still despite of the fact that it was already much better than a smartphone direct output. The high-gain setting will distort and lead to a loss in quality of audio though, so I never really turned on high-gain in any cases. I'll see if I can try the SE846 some time later with high-gain and give you a more certain answer!
Cheers. :)
ansonchc
Awesome, thanks! I agree that the high-gain setting can lead so some distortion in the highs, but it really depends on the IEM/Headphone. My Ultrasone Pro 2400's handle it fine, but on some IEMs it ruins the sound profile.
This or the Fiio a3?
I'm one of the rare individuals who can only pay through PayPal for reasons I'll keep to myself. So sites like Amazon are a no-go.
TheTaggerung
Use gift cards
Dose of reality, $39.99 Amazon with free shipping (US) and they take returns without a whisper https://www.amazon.com/TOPPING-Portable-Headphone-Amplifier-Smaller/dp/B073SSPCSY/ref=sr_1_4?ie=UTF8&qid=1515343906&sr=8-4&keywords=Topping+NX1s+Portable+Headphone+Amp
ScroogeMcDuck
There are reasons to buy from MD, even when prices are close to Amazon. For one, Amazon has become horribly sloppy with shipping things to where I live (PR), so even if I have a Prime membership, they're taking a month or more on many things, so even though Massdrop uses a horrible shipping service, they sometimes are able to get the product to me faster than Amazon! I really have no idea what's going on with Amazon's logistics, but this is an issue I've raised over customer support with them multiple times and they give me extra free months of Prime and credit balance but still can't get things shipped to me any faster so Massdrop has become much more attractive, even if the savings is just $5 or so (though sometimes it's much more).
$40 amazon.
Bronx1guy@yahoo.com Just bought the NX1s not from here i actually got it cheaper and i have to say it's a beast . I own the Fiio fujiyama and the Mont Blank by Fiio and right now this one is my favorite besides the fact you can hide it on your phone with a couple of tiny pieces of loctite putty and it comes right off anyway,the sound this little guy gives you is amazing nice tight bass with bass boost but what got me the most was the detail in the music I was listening to. It's probably the hi res audio but this little amp kills. Now I'm going to buy the NX2s and I'm almost positive I won't be disappointed did I mention the build it's solid precise and sexy it just feels great and the sound it creates won't disappoint IMO.
$39.99 and you will get it Thursday.
https://www.amazon.com/TOPPING-Portable-Headphone-Amplifier-Smaller/dp/B073ST7NNY/ref=sr_1_3?ie=UTF8&qid=1511884940&sr=8-3&keywords=Topping+NX1s
Mass drop lies on the retail price. I just researched, and the retail price is 39.99. I do not abide by liars, MassDrop has lost my respect and business.
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Adalus
What they're actually listing is probably MSRP.
Yes - one month vs two days! If I'd realized it was another month after the drop closed, there would be NO WAY I buy it here!!!
Very discreet flask. Will this get me through airport security?
I think it having a gain switch is super cute, scared it might blow up my 600-ohm Beyers
Can this amp be used with PC while being constantly plugged in to usb for power, or will this kill the battery and it is only inteted to be used as portable amp on the go?

Maybe somebody can help me with advice regarding my need and a recomendation of a good amp for my particular set up. I just bought myself a pair of DT 770 Pro 80 ohms to be used mostly on my PC for streaming and listening to music etc. I have an external sound card with dac and built in amp (Asus Xonar U7). While this card can get my dt’s to an uncomfortably loud levels, I dont feel like there is enough bass coming out of my cans (I heard that the 80s supposed to be really bassy, but even my Logitech X-550 speakers, which are very far from being and audiphile piece of equipment give me a much punchier lows).

Also, I tried using my dt’s with my pixel xl, and the sound is super quite and bass is non-existent. I am not planning to be using the dt‘s on the go a lot, but I am getting the koss porta pro massdrop eddition whenever they will be shipped to me from md around December.

So tl;dr, is it worth it getting an amp for my dt’s, and is it going to improve the bass compared to my asus xonar u7? If so, will this be a decent amp for my purposes or can you recomend something I ahould get instead in the under 100$ range? Will the porta pros benefit from an amp?

Thanks
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I'm user photosonic on Head-fi also. I've posted in that thread and going to do the solder bypass soon.
makats
an amp will clearly improve your sound, but a better one will improve it better. take a look at the aune b1 too. this, probably will make them sound better but one of those, much better.
Again, for those whose shipping fee at checkout is ridiculously high (mine shows a whopping US$21 shipping fee):
https://www.aliexpress.com/item/TOPPING-NX1s-Portable-Digital-HiFi-Hi-Res-Headphone-Amplifier-for-PC-Smartphone-Playback-Time-More-Than/32830591867.html

~US$33 if the seller provides free shipping to your country.

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