[Plancu]

I haven’t tried. The battery in this little gem seems to last forever. (By forever I mean a solid 40 hours plus)

Thank you. I hope you remember this next time you charge it and perform a small test.

 

[Plancu]

Can anyone can confirm this article ?

https://www.audiosciencereview.com/...ing-nx1s-portable-headphone-amp-review.10557/

Is there a bass roll off like in the image below ?

https://www.audiosciencereview.com/...quency-response-audio-measurements-png.43752/

 

[myromeo]

Can anyone can confirm this article ?

https://www.audiosciencereview.com/...ing-nx1s-portable-headphone-amp-review.10557/

Is there a bass roll off like in the image below ?

https://www.audiosciencereview.com/...quency-response-audio-measurements-png.43752/

There is bass roll off below 20hz but honestly it’s barely noticeable. If it bothers you there is a really simple mod you can do to eliminate the roll off by soldering a bypass wire across two capacitors on the amp. See this post here for a good photo showing where to connect. I’ve done this mod mainly because I feel the need to constantly tinker with things and I’m very happy with the sound. This mod is also discussed in detail in this thread, around pages 138 onwards.
https://www.head-fi.org/threads/top...ifier-impressions-thread.696825/post-15655669

 

[Plancu]

There is bass roll off below 20hz but honestly it’s barely noticeable. If it bothers you there is a really simple mod you can do to eliminate the roll off by soldering a bypass wire across two capacitors on the amp. See this post here for a good photo showing where to connect. I’ve done this mod mainly because I feel the need to constantly tinker with things and I’m very happy with the sound. This mod is also discussed in detail in this thread, around pages 138 onwards.
https://www.head-fi.org/threads/top...ifier-impressions-thread.696825/post-15655669

Thanks

TOPPING NX1 is back on my list

I don't even think I hear 20Hz. I did a test once with a 20Hz sine and I couldn't hear it. Someone else could, so at least the equipment was working properly

 

[jayfree]

In case anyone stumbles on this thread, https://www.mouser.com/ProductDetail/505-MKS22.2-50-10 is a direct replacement capacitor with more capacitance.

 

[myromeo]

In case anyone stumbles on this thread, https://www.mouser.com/ProductDetail/505-MKS22.2-50-10 is a direct replacement capacitor with more capacitance.

Have you confirmed they fit in the NX1S? Not a whole lot of space in there…. Data sheet shows they’re 5mm x 10mm x 7.2mm, I’ll open my amp tomorrow and compare to the stock caps. If I think they’ll fit I’ll order some and give them a go. No means of measuring difference but I can’t help but tinker.

Manufacturers part number is

MKS2B042201F00KSSD​

Mouser is out of stock but available in various other places. If they fit in the case they should render the drop off inaudible and far better than the 18Hz shelf of the stock components.

Edit : stock caps measure 4.3 x 9.1 x 7.0, the 2.2uf caps above will fit.

The next size up, 3.3uf would likely fit too although very snug!

I’ll order up some 2.2’s, I think the NX3 uses 2.2 and measures much better. Will post update once fitted.

 

[myromeo]

Follow up to my last post… I did a thing.

Firstly, theoretical measurements show stock a 5.48dB loss at 10Hz compared to only 1.83dB modified. The -3dB point shifts from around 17Hz to under 8Hz. A big improvement. Measurements taken from around the web show an output impedance of 3.5 ohm, volume pot is 10k ohm, stock cap 1.0uF, upgrade cap 2.2uF. I've set volume to 100% for purpose of the caps as it shows clearest the fall off.

Secondly, be careful ordering the WIMA caps, it seems some newer batches of the previously posted part number are using the 63v shell so will not fit. Check with your supplier, they should measure 7x4x10mm, not 7x7x13! (Width x depth x height)

Ok, on to some pictures, first the charts, courtesy of ampbooks.com and using the values stated above. a 3.3uF cap would be even better but space is TIGHT!

Look at that drop off starting right up at 50Hz or so, that’s no good!


Secondly lets take a look with 2.2uF caps instead, now we can see that 10Hz -5.48dB loss reduced to a much more preferable -1.83dB and the drop off starting much lower at around 25Hz. That's a lot of bass regained!


And a few photos of the modification itself, this one before, sizing up the new caps, yep, they're pretty close to stock size! If anything slightly deeper but of no concern.


During... plenty space to work with now the stock 1uF caps are gone.


After... Those lovely red WIMA's soldered in place. CARE POINT: The pins are about 1mm too long, they protrude too far out the back to fit into the case so trim them before you fit them then carefully fold the pins 90 degrees as per the stock part before soldering and you'll have no issue fitting it in the case.


Finally, gotta test it out, easier to do so with the case off just in case... yup, all working fine and sounds great! improved sub bass rumble, sounds clearer and more forward and dynamic range seems to be improved. Overall very pleased with the result. I haven’t got means of measuring the result and with any mod, some of the improvement could be in my head…


Cost wise capacitors were from eBay UK and £1.35 each plus postage. I ordered 4 'just in case'. Didn't need the two extras so now I have spares. They'll go into my odds and ends box 'forever'..

Took 15 minutes. Worth it? Hell yeah, I mean, why not, I like to tinker and soldering is very relaxing. You could simply bypass the caps, DC is low enough but this seems a better technical solution. Now. What to modify next...

 

[funkymartyn]

Just been re reading most of this thread. Retro today , Xduoo X3 line out into my mint Topping NX1 into my Grado GS1000 i, and mint Senn HD580. All good still.

 

[Steranko]

Dear All,

I have an LP6TI and looking to add an additional portable Amp to this to bring it to the next level. I was looking at the Cayin C9. If no expensive spared are there any more small portable amp I can look at to complement the Lp6TI? My requirements are it has to be portable but can give a desktop grade Amp and power to the LP6TI. I don't mind whether it's SS or tube based Amp. Ideally, I want something small. Any others that people have tried and think it is good and would recommend? Thanks in advance!

 

[Jackhomo]

Error