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Topping NX3s

Discussion in 'Portable Headphone Amps' started by Magicman74, Oct 17, 2018.
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  1. Shane D
    Got an email from Mass Drop today about Black Friday sales. Nothing interested me, however...it stated that my amp shipped two days ago!

    As I recall, they weren't supposed to ship until December 27th. Nice surprise.

    Shane D
     
  2. John Biser
    I also own NX3s. For those interested in output impedance, it is 5 ohms, confirmed by Topping. As far as power levels, they publish detailed THD V Voltage graphs. For instance, the 300 ohm graph shows noise decreasing until approx 4V (50 mW, which coincidentally is what they use for their detailed THD+Noise spec), but has a soft knee and has risen to only 0.0005% at 5V (approx 80 mW).That's right, three zeroes. I'm guessing that's about the limit for CLEAN power, but its also the edge of the graph, so who knows. Toppings measurements are generally reproducible by other people. Amir at audiosciencereview has had my unit in his queue for about three weeks, hope to see his review soon. If his measurements are similar, these are fantastic numbers both for noise and for power from such a small unit. Cheers.
     
    Alberto01 likes this.
  3. Shane D
    Thanks for the input! Have you tried to use it to drive any hard to drive headphones?

    Shane D
     
  4. Magicman74
    They drive my 650s easy with room left. It really does have some power.
     
  5. Shane D
    Yeah, if it can drive 650's it won't have any problems with my stuff. As I wait and wait and wait...
    Posties probably stole or threw it away.

    Shane D
     
  6. dogears
    ~$65 very well spent \m/
     
  7. Palash
    Got it for 45$ in 11.11 sale. :gs1000smile:
     
  8. Shane D
    Got mine today, out of the blue. I paid $55.00 US/$75.00 Cdn, with shipping. I didn't have to pick it up at the post office and pay sales tax which was a bonus. Very cool looking and VERY small. It had enough power for me to test it for about three minutes. I was a little underwhelmed and then it was empty. Getting a full charge now. I will be curious to try it in the morning.
    For those of you that have tried it, did you use high gain on your source (if you have one)? In my VERY brief little test, I had my source on High gain and the amp on High gain. It didn't seem super loud on some old David Bowie. My new headphones (HE4XX) take a fair bit more power to drive than my other 'phones. With quieter (read older music), I was having to use the balanced output of my DAP on High gain and cranking it to 90 plus, out of 120. The source output on SE is Much lower so the amp will have to roar. I guess I'll see in the morning.

    Shane D
     
  9. John Biser
    I only own HD650's, which are easy to drive. I only had for two days before I shipped off to audiosciencereview. Also, since I never owned a desktop amp, or even something with this much power, anything I say would be with no point of reference. However, I will say that with my headphones, the extra power really brought out the bass. In fact, even though I was expecting something to this effect, it was a revelation.
     
    Alberto01 likes this.
  10. Shane D
    I am finally getting around to using my amp.
    I was wondering how such a small unit could put out 545mW X 2. I don't think that is actually the case. My DAP puts out 50mW through SE using high gain. Running the signal through the amp at high gain is not 10 times louder. Nor is it 9 times louder, 8 times louder, or 7/6/5/4/3 or even twice as loud. Maybe it is just how it is measured?

    It does add a bit of headroom, especially with bass boost. I am surprised that someone could drive the HD6XX's with this. I owned the HD6XX's and it took my iFi amp to run them well.

    I think this would likely pair nicely with my A17, which really is underpowered. Or if you had an A25/A35/A45. Or a cell phone.


    I am curious if it might change after some burn-in (physical on the player/mental from me).

    So far I am just seeing a little more headroom. Looking forward to trying the Grado's as I really enjoyed bass boost on those with my iFi.

    And to be clear, I did not expect a $75.00 amp to match my former $400.00 amp.

    Cool looking little thing and I will keep playing away. I am thinking about getting something more in the line of a desktop setup, as I only use an amp at home.

    At this price, you just can't lose.

    Shane D
     
    Alberto01 likes this.
  11. SoldierUral
    Hello everybody)
    I'm newbie here and I have a question about NX3s. I really want to change OpAmp in it, but cannot disassemble it. Can anybody give me step by step instructions what I must do to take access to the OpAmp? May be with photos. I really don't understand what to do(
     
  12. Palash
    Follow this youtube video.
     
    Alberto01 and SoldierUral like this.
  13. SoldierUral
    Big thanks to you, now I understand what I must do ... but the problem is in screws ... I can't see them(
    Sorry, I can't insert images( Will try do it myself
     
    Last edited: Dec 31, 2018
  14. SoldierUral
  15. Magicman74
    I posted this on Massdrop about a month ago:
    You'll need a small hex key either 1.3 mm or .050 SAE, Both will work, but I recommend a Ball Ended .050 the screws are very tiny and could strip easy. The Ball end will help if you run into a problem...
     
    Alberto01 and SoldierUral like this.
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