FiiO has released the USBDAC JA11, with an initial price of only $9 (69RMB) and support for PEQ DSD128 PCM384

[danadam]

Some quick notes based on my unit.

1. Looks like the polarity is inverted, here's the impulse response (played 44.1k file, captured at 192k):

2. Under heavy use of 4G it doesn't tics/clicks like my Tanchjim Space but it has elevated noise floor:

3. It suffers from a similar clipping/limiting as my Samsung dongle:

 

[yafengabc]

Emm... I bought a USB dongle from another brand for only 25RMB (a little over $3) FRANSUN T2 Pro, and updated Firmware with Fiio's tools. Now it is recognized as JA11 and works well on both PC and Android phones……

 

[yafengabc]

Some quick notes based on my unit.

1. Looks like the polarity is inverted, here's the impulse response (played 44.1k file, captured at 192k):

View attachment 379042

2. Under heavy use of 4G it doesn't tics/clicks like my Tanchjim Space but it has elevated noise floor:

View attachment 379045

as my Samsung dongle:

View attachment 379048
View attachment 379049

I used REW to output a sinusoidal waveform and observed the output with an oscilloscope, but no clipping was found at maximum volume (32 ohm resistive load). I am a beginner, and I think I should learn from you how to measure.

 

[yafengabc]

No, I have not measured it. I was using a sound blaster xfi HD for the sweeps, I think the THD measurements will be limited by the card, but could give it a try tonight.
If you still have it hooked up, would you mind setting a peak at 1kHz with the parametric EQ in the fiio app and measure a FR sweep to check if you have the same "double frequency" bug I have? Thanks!

I have already forwarded this issue to the official customer service in the QQ group, and they said it is being fixed

 

[danadam]

I used REW to output a sinusoidal waveform and observed the output with an oscilloscope, but no clipping was found at maximum volume (32 ohm resistive load). I am a beginner, and I think I should learn from you how to measure.

The problem is with the files attached in the topic I linked to, not with a constant tone.

Some strange clipping with Samsung dongle

I'm posting this more like a curiosity rather than a problem to solve. In the attachment there are 2 files, 44.1 Khz sample rate, with a series of pulses in groups of 4: In "bw.sweep" each group has bandwidth 500 Hz wider than the previous one, starting from 500 Hz. All pulses are normalized...

www.audiosciencereview.com

 

[CedarX]

Emm... I bought a USB dongle from another brand for only 25RMB (a little over $3) FRANSUN T2 Pro, and updated Firmware with Fiio's tools. Now it is recognized as JA11 and works well on both PC and Android phones……

Not really surprising since, per you picture, the T2 Pro appears to use the same KT02H20 chip…. But it also means that the FW on these chips is not “locked”, tied to a specific OEM.
Great find!

 

[trungdtmc]

Emm... I bought a USB dongle from another brand for only 25RMB (a little over $3) FRANSUN T2 Pro, and updated Firmware with Fiio's tools. Now it is recognized as JA11 and works well on both PC and Android phones……

LOL, i will try with Jcally JM12 when im home

 

[hugwolf]

To each their own but personally I would rather support the company putting effort into making this app work. Even at $14.99, once they iron out the rest of these bugs this device is pretty insane value in my opinion. Microphone and UAC1.0 support icing on the cake as well.

 

[PlasticDoc]

LOL, i will try with Jcally JM12 when im home

And... did it work (with the JadeAudio JA11 Firmware V1.7.zip)?

 

[trungdtmc]

And... did it work (with the JadeAudio JA11 Firmware V1.7.zip)?

it worked, and better than auth JA11 LOL

 

[trungdtmc]

Here are some result measuring. JM12 fake JA11 has better noise floor than stock and has higher level output, i had -0,48dBFS to get same level

multitone is still better

 

[marcheloka]

@trungdtmc

Does PEQ function work as well on this JM12 with 1.7JA11 firmware?

 

[TonyJZX]

https://www.aliexpress.com/item/1005006603858995.html

does this look as well built as the JA11???

 

[trungdtmc]

@trungdtmc

Does PEQ function work as well on this JM12 with 1.7JA11 firmware?

yes, everything fine as JA11, also x2 freq bug

 

[MCH]

I see the JM12 at 7.5 eur in AliExpress too. I am tempted to get a couple more to have one dongle per headphone, but the power consumption, grrrr if it wasn't that, this would be perfect

 

[trungdtmc]

JM12 get higher level than JA11, JM12 -0,48dBFS to get same level as before flashed but JA11 only -0,1dBFS to get same

 

[hypervoice]

Performance wise how is this compared to a CX31993 or Apple Dongle?

 

[marcheloka]

This is a great question. I would also love to know. @trungdtmc posted some graphs above. Maybe someone will be able to compare them to other popular budget dongles. Unfortunately i am not tech savvy enough to accomplish Such a quest

 

[yafengabc]

Here are some result measuring. JM12 fake JA11 has better noise floor than stock and has higher level output, i had -0,48dBFS to get same level

yes, everything fine as JA11, also x2 freq bug

I also want to measure my device, but I don't know what tool to use? I imagine using a resistor as a load and using another sound card to measure the voltage?

 

[hugwolf]

Has anyone else noticed strange behavior with the voice preset? Not that I ever use it but it's noticeable because it's the default option. It always seems to be affected by the previous EQ I used. The default profile for it is totally messed up.