Was looking for my first stack build which was portable enough to carry and can power my demanding cans, couldn't find nothing special or exact combo i was looking for.
Otta nowhere topping announced their NX7 and that same time lotoo announced lineout feature coming for both Paw S1,S2, and right away i made up my mind for Paw S1 + NX7 combo.

Thanks to hpz for bringing in the NX7 lightning fast to india, and here we are, powerful yet low profile stack for my 650.

NX7 is clean, transparent + powerful amp, adds no coloration to source (thanks to NFCA technology), well built, in hand feel is awesome, battery backup is great also even on high gain, don't own iems so couldn't check channel imbalance in low volume. Can drive my 650 in high gain at 1-2 o'clock on volume pot with more than adequate volume and room left for much more. It's a awesome device and just what i was looking for.

Now waiting for topping to release a fully balanced portable amp.

Form factor, design and sound quality are just great. Bought this confidently after reading other 2 reviews on HPZ and Joshua Valour’s review on YouTube.
As a side note, Raghav should actively start reviewing on YouTube as well!

I will just explain my set up here, I am using Apple MacBook Air M1 and Apple Music as source device and streaming service respectively along with Shanling M3X as dual DAC Line-out set-up and also as a source device as per convenience as well.
I need to use Sundara on High gain and Fiio FH5S Pro on Low gain to drive them to their full glory.
Also, this is a pure Amp device so you will need a DAC to improve the sound quality. Thanks.

Didn't expect it to sound so good.
1400 mw at 32 ohm in such a small package, with a 4000 mAh battery, at this price. Unreal!
Pitch black background. Doesn't colour the output. Just does what it's supposed to do, amplify the analog signal. Tried it with my trusted duo of Sundara and Senn 650.
Loved the pairing with Fiio FD3. Terrific bass (this IEM is good, really good for it's price).
This setup of Lotoo Paw S1 (lineout) to NX7 gives my iFi balanced desktop stack a run for its money.
Might sound ridiculous, but, on some tracks this portable setup sounds better than my ZenDAC+Zencan desktop stack.

The NFCA module embedded in the NX7 delivers incredible, clean and crystal clear sound and takes the performance of my Sundara to the ultimate level!
Ever since I got my Sundara, I have been searching for a portable amp which delivers justice to the extraordinary abilities of the Sundara. I first got myself a Hip Dac2. Through the balanced port it gave a decent output, but I had to crank up the volume to 90% to get a decent sound, leaving very little headroom. The X Bass offered some support on the bass front, but somehow, the sound was not with the X Bass on was not optimal to my listening sense.
Given the need for an amplifier, I paired the Hip Dac2 with my old Fiio A3 Amp. It was a definite improvement but still not what I was looking for. Distortion at higher volumes was discernible.
Given the specs and the reviews of the Topping NX7, it was an obvious choice. It pairs well with the Hip Dac and sounds incredibly detailed with an impressive soundstage, imaging and resolution. The problems with the X Bass in the stand alone Hip Dac configuration is no longer an issue and the bass blooms now. The NFCA circuitry is truly legendary and it makes all the difference. The Sundara never sounded better.
The way that I have configured the pairing is to keep the volume of the Hip Dac to Max and use the volume of the NX7 to suit my listening pleasure. X Bass is invariably set to on, save for some really bass heavy tracks. I use the gain to High in the Hip Dac and to Max in the NX7. This is the ultimate configuration for the Sundara given my listening needs.
The NX7 is a solid piece of electronics. It weighs over three times the Hip Dac (which is a DAC plus Amp). It looks and feels solid, just as an amp should be.

Before Nx7 that Oomph was missing in the Music.
After adding it, the Soundstage has quite improved.
At such small form factor its output is phenomenal.
I am using it with my M3x where M3x is my source device with dual dac line-out setup.
It drives Thieaudio Oracle to their Full Glory.

I am loving it..
Thank you Headphone Zone.. :)