Topping NX7 announced

[GeorgeWalk]

TOPPING NX7 Portable Headphone Amplifier

The TOPPING NX7 is a portable amplifier with the features that count: incredibly low distortion, 20 hour battery life, and loads of output power. NFCA amplifier The new NFCA amplifier circuit was specifically designed for portable amplifiers. With a THD+N of 0.00007% and an SNR of 135dB, the NX7...

apos.audio

 

[shanecoughlan]

Interestingly the feature set seems quite different to the NX4 DSD. Unless I am mistaken, rather than a combined DAC/AMP, this is a pure-play amp?

 

[GeorgeWalk]

Yes, it looks that way.

 

[Atanasi]

This amp is rather large for a portable device, comparable to a phone but even thicker.

 

[brandall10]

This amp is rather large for a portable device, comparable to a phone but even thicker.

It's decently small considering how powerful it is and the battery needed to achieve that runtime. Unfortunate that it's not a DAC/Amp unit.

 

[Tortie]

HI @amirm, are there any plans to review and measure the NX7?

 

[ZolaIII]

Interestingly the feature set seems quite different to the NX4 DSD. Unless I am mistaken, rather than a combined DAC/AMP, this is a pure-play amp?

In that regard NX4 whose exception as stated with DSD. Actually I am interested in NX7 as they didn't done anything new for a long time regarding the portable amplifier market (that they started with).

 

[staticV3]

HI @amirm, are there any plans to review and measure the NX7?

Already measured by @WolfX-700 :

Measurements of Topping NX7 Portable HPAmp - L7Audiolab

便携设备 额……这台便携式耳放，是拓品的NX系列（之前我从没测过这个系列）即将推出的新产品。我印象当中拓品的便携就没有特别出彩的=。= （BC系列其实还行）。无论如何，这是 Topping NX7 ，一台自带电池的便携式耳放：

www.l7audiolab.com

 

[Tortie]

Already measured by @WolfX-700 :

Measurements of Topping NX7 Portable HPAmp - L7Audiolab

便携设备 额……这台便携式耳放，是拓品的NX系列（之前我从没测过这个系列）即将推出的新产品。我印象当中拓品的便携就没有特别出彩的=。= （BC系列其实还行）。无论如何，这是 Topping NX7 ，一台自带电池的便携式耳放：

www.l7audiolab.com

Yes, I already read through that blog post a week ago. The thing is Wolf had access to a pre-preproduction golden-sample unit. The retail version may deliver less performance.

 

[JSmith]

HI @amirm, are there any plans to review and measure the NX7?

Amir measures whatever is sent to him, so if the manufacturer sends one in or someone else (you could?) does then it will be tested.

pre-preproduction golden-sample unit

I think it's a bit rough to imply what Prof Wolf tested was a "golden sample"... that is up to the veracity of the manufacturer, not the tester so always an unknown.


JSmith

 

[Atanasi]

L7Audiolab didn't include channel balance.

 

[fgfgfg]

It's OPA1612 (1pc) + BUF634A (4pcs) powered up by TPS65131

 

[Atanasi]

What's the meaning of "Adapter Impedance >8 Ω" in the specs, is it the minimum allowed headphone impedance? Why does the manual say that the USB cable should not be used with other devices, is it not a standard-compliant A-C cable? I suppose this could have the same issue as BC3, such that C-C cables don't work for charging.

 

[dizzyraider]

What's the meaning of "Adapter Impedance >8 Ω" in the specs, is it the minimum allowed headphone impedance? Why does the manual say that the USB cable should not be used with other devices, is it not a standard-compliant A-C cable? I suppose this could have the same issue as BC3, such that C-C cables don't work for charging.

Not sure, but I use my own pre existing usb A>C cable to charge usually and it charges just fine, but it however didn't work with C to C charging.

 

[Atanasi]

"Adapter Impedance >8 Ω" in the specs, is it the minimum allowed headphone impedance

"Adapter impedance" is probably a machine translation for "Matching impedance", the Chinese words seem to mean impedance matching.

 

[SimoF]

Where can I find the input impedance?

 

[staticV3]

Where can I find the input impedance?

Not on Topping's website. Perhaps @JohnYang1997 can answer your question?

 

[SimoF]

It's under 0.6 Ohm

I'm asking about input impedance. Not output impedance.

 

[frogmeat69]

Nice to see a product to possibly take the place of the FiiO A5, mine is still working great, but the battery is showing some age. Don't use it all of the time, so hope it holds on for a while.

 

[Tortie]

I'm surprised @amirm hasn't reviewed this yet. Maybe the market for amplifier-only portable product has diminished to such an extent that it's not worth doing measurements on a product like the NX7. Even so, it looks like a potential Best-in-Class product for this particular niche.