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The headphone section uses RT6863 op amps in parallel, as they are two of them. I had it for a week and sold it.

@staticV3 Thanks for the reply.

@staticV3 I do have question. The hardware button on Sonata HD pro, does it control the digital signal entering the Dac chip or the analog signal coming out of dac chip?

Model: PARA Full-size Planar Headphones Sensitivity: 101dB/Vrms (@1kHz) Impedance: 8Ω±15% (@1kHz) Frequency Range: 15-53kHz (IEC61094, Free Field) Headphone Jack: 3.5mm Effective Frequency Range: 20-20kHz (IEC60318-4, -3dB) Specs are from their official website. Topping A90 can drive load...

100mm diaphragm, 8 ohm impedance, pretty much in loudspeaker category.

This was the first one I owned. Last one I owned. It was priced around 140 USD. Horrible built quality and looked awful, sounded good, didn't last long.

I am quite intrigued. Ex Sony engineer had a hand in its development? https://shenzhenaudio.com/products/moondrop-discdream-portable-cd-player

Same as Space and BHD pro, costing even less. I wouldn't be surprised if it has similar performance.

Looks like an oversized smart watch if not for that headband!! Thanks for the review.

Very unfortunate.Assuming the unit was still under warranty,they should have replaced it with the newer model.

Thanks Veri for the explanation.Is this the reason they use lpf in DAC output?

20KBWR means 20 hz to 20khz,right channel 90KBWR means 20 hz to 90khz,right channel Am I right or wrong? What is the significance of this test?

What does KBW stand for? How to interpret this result?

No,price of 9038D is good.I think I read somewhere that you stopped the production of 9038D because of certain parts used in the product became expensive.

It's not a guess ,W2 dac does use RT6863.So does Moondrop moonriver 2,Hiby fc5 and Shanling UA5.All these usb dacs are expensive.Is using Texas instruments op amps that difficult? Any chance of making a usb dac with op amp,like a lower version of 9038D ? I mean by not using expensive...

I do own Khadas tone board and E1DA 9038D.I do prefer your dac,as I use it with headphone amplifier.My question is, fiio is using this op amp in Ka 3 usb dac.Why is this op amp a bad choice for headphone amplification ? None of the reviews ,both subjective and objective mention it is bad performing.

I am an Doctor / Agriculturist by profession.The last I read about anything related to electronics was in 1995 before joining my Medical profession.I do like to know what really is been used in Sh-6 .Yes,the markings on the op amp is removed. I do have fiio k5,just purchased this ,frankly...

I do have the Sh-6 amplifier.Going by your information ,looks like they are using OPA 1612 to drive headphones.

How do these music app work? I am unable to find a simple answer.I have tried Uapp and Hiby both sound different.How is that possible? If these apps are sending digital data to a usb dac shouldn't they sound the same? Does listening from the usb dac directly connected to headphone and using...

Speakers I was referring to