TOPPING NX1 Portable Headphone Amplifier Impressions Thread | Page 102 | Headphone Reviews and Discussion - Head-Fi.org

TriTone333 · Feb 11, 2015 at 8:04 AM

peter123 said:
Thank you (again), unfortunately the shipping cost from the US over here are often very high (in this case USD30-40 it seems)......

Wow, yeah, I guess that makes it not so good a deal.

Baycode · Feb 11, 2015 at 8:41 AM

I read the internal components of NX2 as on the below (from the page that @EISENbricher provided): http://www.radioddity.com/us/topping-nx2-ultra-slim-portable-audio-amplifier-headphone-earphone-amplifier-with-usb-dac.html

2x WIMA capacitors
1x TP9260 amp chip (single, with 16 legs)
1x BurrBrown PCM2704 DAC chip

EISENbricher · Feb 11, 2015 at 9:03 AM

baycode said:
I read the internal components of NX2 as on the below (from the page that @EISENbricher provided): http://www.radioddity.com/us/topping-nx2-ultra-slim-portable-audio-amplifier-headphone-earphone-amplifier-with-usb-dac.html

2x WIMA capacitors
1x TP9260 amp chip (single, with 16 legs)
1x BurrBrown PCM2704 DAC chip

Good observation, BayCode.

So.. the OPAMP is different from NX1 (It uses OPA1611/1612).. maybe this might offer kinda different sound sig.

Oh... and there are 2 miniUSB inputs... one for charging and one for DAC operation. Isn't that kinda weird?
Maybe they have done this so that the NX2 won't drain charging current when connected to phone. But still, in case we are connecting to PC your NX2 won't charge.

One more thing... maybe the battery life is VERY different between modes of operation. (AMP operation and AMP+DAC operation).

Baycode · Feb 11, 2015 at 9:04 AM

As of this writing I got a reply from Tool_Nerd. I paste e-mail on the below. Disappointing battery life...

Dear baycode,

Hi there,

Thank you for contacting us.
The acutal battery life would be about 5-6 hours.
Thank you.

Code:

 FOLLOW US ! ☞☞❤[url=http://www.ebay.com./usr/tool_nerd]http://www.ebay.com./usr/tool_nerd[/url]❤

H20Fidelity · Feb 11, 2015 at 10:32 AM

Thanks Baycode,

I know a member who's been in contact with Topping once before regarding NX1. Let me ask him to double confirm for us directly from them. It might take a day or two.

Baycode · Feb 11, 2015 at 10:38 AM

h20fidelity said:
Thanks Baycode,

I know a member who's been in contact with Topping once before regarding NX1. Let me ask him to double confirm for us directly from them. It might take a day or two.

OK, thanks, good luck H20!

bhazard · Feb 11, 2015 at 1:03 PM

That DAC doesn't go past 48k. Not good for hi-res audio.

Omegart · Feb 11, 2015 at 2:45 PM

charleski said:
The capacitors are ringed in red. They're 1uF polypropylene with 0.1uF PP bypass caps that will block DC but, because the input impedance is high, they won't cause too much low-frequency roll-off.

Causing not too much low-frequency roll-off will mean? Can I do a capless iphd mod to my ipod 5.5 without harming the amp or the iem? (Shure se215, but i'm about to replace them with livezoner41 ciem lz4)

charleski · Feb 11, 2015 at 8:36 PM

omegart said:
Causing not too much low-frequency roll-off will mean? Can I do a capless iphd mod to my ipod 5.5 without harming the amp or the iem? (Shure se215, but i'm about to replace them with livezoner41 ciem lz4)

The NX1 is is 0.5dB down at 20Hz, which will be inaudible. Yes, you could remove the output caps on the iPod since the NX1's input caps perform the same function. But it looks very fiddly.

charleski · Feb 11, 2015 at 9:19 PM

eisenbricher said:
Good observation, BayCode.

So.. the OPAMP is different from NX1 (It uses OPA1611/1612).. maybe this might offer kinda different sound sig.

Oh... and there are 2 miniUSB inputs... one for charging and one for DAC operation. Isn't that kinda weird?
Maybe they have done this so that the NX2 won't drain charging current when connected to phone. But still, in case we are connecting to PC your NX2 won't charge.

One more thing... maybe the battery life is VERY different between modes of operation. (AMP operation and AMP+DAC operation).

The NX1's opamp is also a 16-pin device, so it definitely is not an OPA1611/2, which are 8-pin. I note that there's a Chinese page from Oct 2014 that seems to claim the NX1 is also using the TP9260. An alternative guess would be that it's using a MAX9722 and the circuit certainly seems to match that chip (DC-driven output from battery power). The PCM9704 actually includes a headphone amp within the package, though it's a bit wimpy (12mW into 32ohms), so it looks like they're using a separate amp stage for the output. I can't find any sort of datasheet on the TP9260, but it might be a chip that Topping have commissioned themselves.

DJScope · Feb 11, 2015 at 11:11 PM

h20fidelity said:
Thanks Baycode,

I know a member who's been in contact with Topping once before regarding NX1. Let me ask him to double confirm for us directly from them. It might take a day or two.

Ok so I've gotten a reply from Topping. They said:

Charge time is 3 hours
Battery life total life is 500 cycles (standard Lithium 100%-0% discharge cycles)
100 hours of low current output.

-------- Original Message --------
From: 黄 <amp2006@163.com>
Sent: Thursday, February 12, 2015 03:07 PM
To: Igor Rebenko
Subject: Re:Re: Re:RE: TOPPING NX1
about 100 hour for low power output.

-- Thanks and best regards
Hailin Huang
------------------------------------------------------------------------------------------
GUANGZHOU TOPPING ELECTRONICS AND TECHNOLOGY CO, LTD.
Tel:+86-020-37219489
Mob:+86-15800009791
Fax:+86-020-37219489
http://www.tpdz.net/
-----------------------------------------------------------------------------------------

在 2015-02-12 12:05:07，"Igor Rebenko" 写道：

What about the tested battery time for one cycle?

Regards,

Igor Rebenko

-------- Original Message --------
From: 黄 <amp2006@163.com>
Sent: Thursday, February 12, 2015 02:50 PM
To: Igor Rebenko
Subject: Re:RE: TOPPING NX1
Hello

Thank you for your mail!

The charge time of the battery is around 3 hours, cycle life is 500.

-- Thanks and best regards
Hailin Huang
------------------------------------------------------------------------------------------
GUANGZHOU TOPPING ELECTRONICS AND TECHNOLOGY CO, LTD.
Tel:+86-020-37219489
Mob:+86-15800009791
Fax:+86-020-37219489
http://www.tpdz.net/
-----------------------------------------------------------------------------------------

At 2015-02-12 06:11:24, "Igor Rebenko" wrote:

Hello again!
It's been a while, but I see you've finally got the Topping NX2 to the market. Congratulations!
There seems to be some confusion about the battery. Can you please comment on battery charge times and expected battery life of the unit.

Thank you!

Igor Rebenko

Click to expand...

H20Fidelity · Feb 12, 2015 at 2:39 AM

djscope said:
Ok so I've gotten a reply from Topping. They said:

Charge time is 3 hours

Battery life total life is 500 cycles (standard Lithium 100%-0% discharge cycles)

100 hours of low current output.

-------- Original Message --------
From: 黄 <amp2006@163.com>
Sent: Thursday, February 12, 2015 03:07 PM
To: Igor Rebenko
Subject: Re:Re: Re:RE: TOPPING NX1
about 100 hour for low power output.

-- Thanks and best regards
Hailin Huang
------------------------------------------------------------------------------------------
GUANGZHOU TOPPING ELECTRONICS AND TECHNOLOGY CO, LTD.
Tel:+86-020-37219489
Mob:+86-15800009791
Fax:+86-020-37219489
http://www.tpdz.net/
-----------------------------------------------------------------------------------------

在 2015-02-12 12:05:07，"Igor Rebenko" 写道：

What about the tested battery time for one cycle?

Regards,

Igor Rebenko

-------- Original Message --------
From: 黄 <amp2006@163.com>
Sent: Thursday, February 12, 2015 02:50 PM
To: Igor Rebenko
Subject: Re:RE: TOPPING NX1
Hello

Thank you for your mail!

The charge time of the battery is around 3 hours, cycle life is 500.

-- Thanks and best regards
Hailin Huang
------------------------------------------------------------------------------------------
GUANGZHOU TOPPING ELECTRONICS AND TECHNOLOGY CO, LTD.
Tel:+86-020-37219489
Mob:+86-15800009791
Fax:+86-020-37219489
http://www.tpdz.net/
-----------------------------------------------------------------------------------------

At 2015-02-12 06:11:24, "Igor Rebenko" wrote:

Hello again!
It's been a while, but I see you've finally got the Topping NX2 to the market. Congratulations!
There seems to be some confusion about the battery. Can you please comment on battery charge times and expected battery life of the unit.

Thank you!

Igor Rebenko

Click to expand...

Click to expand...

Great, thanks for confirming mate, straight from Topping themselves.

EISENbricher · Feb 12, 2015 at 3:31 AM

baycode said:
As of this writing I got a reply from Tool_Nerd. I paste e-mail on the below. Disappointing battery life...

Dear baycode,

Hi there,

Thank you for contacting us.
The acutal battery life would be about 5-6 hours.
Thank you.

Code:

FOLLOW US ! ☞☞❤[url=http://www.ebay.com./usr/tool_nerd]http://www.ebay.com./usr/tool_nerd[/url]❤

I got reply from tool_nerd today. It is different.

below is the email trail

[size=10pt]Dear customer,

Sorry for any trouble.
The correct battery life is also 100hrs as the old one.

Should you have other concerns, please feel free to contact us. We will reply as soon as possible.

Best regards,
Annie[/size]

Code:

 [color=#666666]FOLLOW US ! [/color][color=#666666][font=ms mincho]☞☞❤[/font][/color][color=#666666][url=http://www.ebay.com./usr/tool_nerd]http://www.ebay.com./usr/tool_nerd[/url][/color][color=#666666][font=ms mincho]❤[/font][/color][color=#666666][/color]

[size=10.0pt]

$(KGrHqZ,!m!E4smtktGVBOLjct8dsg~~_11.JPG

[/size]

[size=8.0pt] [/size]

[size=8.0pt]From: xxxxxx
To: tool_nerd
Subject: Details about item: xxxxxx sent a message about Topping NX2 Ultra Slim Portable Headphone Rechargeable Amplifier with USB DAC #261770552123
Sent Date: 11-Feb-2015 18:05:11 IST[/size]

[size=10pt]Dear tool_nerd,[/size]

[size=10pt]Hi,

I am considering to buy Topping NX2 amplifier, but the description is not very clear and that is preventing me from ordering this amp.

Please, let me know about the battery life. The previous version (Topping NX1) has 100hrs battery life, but it is written in your description that NX2 lasts for only 4hrs.

I kindly request you to provide me details, I'll be thankful.

- [/size]xxxxxx

Baycode · Feb 12, 2015 at 3:40 AM

eisenbricher said:
I got reply from tool_nerd today. It is different.

below is the email trail

[SIZE=10pt]Dear customer,

Sorry for any trouble.

The correct battery life is also 100hrs as the old one.

Should you have other concerns, please feel free to contact us. We will reply as soon as possible.

Best regards,

Annie[/SIZE]

Code:

[COLOR=666666]FOLLOW US ! [/COLOR][COLOR=666666]☞☞❤[/COLOR][COLOR=666666][url=http://www.ebay.com./usr/tool_nerd]http://www.ebay.com./usr/tool_nerd[/url][/COLOR][COLOR=666666]❤[/COLOR]

[SIZE=10pt][COLOR=666666]

[/COLOR][/SIZE]

[tr]
[tr] [td]

[/td][/TR][/tr]

[SIZE=8pt][COLOR=666666]From: xxxxxx

To: tool_nerd

Subject: Details about item: xxxxxx
sent a message about Topping NX2 Ultra Slim Portable Headphone Rechargeable Amplifier with USB DAC #261770552123

Sent Date: 11-Feb-2015 18:05:11 IST[/COLOR][/SIZE]

[SIZE=10pt]Dear tool_nerd,[/SIZE]

[SIZE=10pt]Hi,

I am considering to buy Topping NX2 amplifier, but the description is not very clear and that is preventing me from ordering this amp.

Please, let me know about the battery life. The previous version (Topping NX1) has 100hrs battery life, but it is written in your description that NX2 lasts for only 4hrs.

I kindly request you to provide me details, I'll be thankful.

- [/SIZE]

xxxxxx

[tr] [/tr]

It seems that -in the meantime- Topping (and possibly tool_nerd ) noticed the trouble of the tool_nerds non-correct information and they start to correct it. Anyway, good to see this.

Thanks for sharing.

DJScope · Feb 12, 2015 at 4:45 AM

baycode said:
It seems that -in the meantime- Topping (and possibly tool_nerd ) noticed the trouble of the tool_nerds non-correct information and they start to correct it. Anyway, good to see this.

Thanks for sharing.

I think what's happening is that tool nerd watches this thread! I wouldn't be surprised he he/she was.

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