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Makes sense. However in the case of Topping it seems that they have been submitting new products to be certified by the FCC lately instead of relying on certification of the BT module. FCC grantee code 2BDXM (products certified: D90 III, D90 III Discrete, BT remote, D50 III)

They certainly don’t use it for DSP. I guess it makes sense not to upgrade when SMSL doesn’t even use aptX adaptive on the QCC5125…

One thing I don't understand is that Topping, SMSL etc. seem to stick with the QCC5125 BT SoC for years...

It says that they collaborated with Holo Audio and the THD+N figure (-106dB) as well as the board layout do seem to resemble those of the Cyan 2 Cyan 2: Cyan 2 specs: PCM: THD+N 0.0005% @1K (-106dB) DNR -127dB Voltage Output 2.5Vrms(RCA), 5.0Vrms(XLR) DSD 128X: THD+N 0.0002% @1K (-114dB) DNR...

seconded

I think unlikely. I don't think Topping, SMSL and the likes are known for adding major features after product launches :( Also I noticed an unmarked chip on both the D50 III and the D90 III Discrete, and AFAICT there is no such chip on the DX9. Maybe Topping's PEQ implementation is done inside...

I'm getting popping sounds when driving the HE6se at >-10 dB on high gain for testing. Is it normal or is my unit defective?

Should I update my A70 Pro to firmware version 2.05? Currently it's on 2.02

Yeah you need to switch to the DFU mode

Have you tried clicking on the connect button? - open drop-down menu "Options -> Connect"

Yes, I meant version 1V0A6. I would recommend minimum phase for PCM, or you can choose apodizing if you want full attenuation at the Nyquist frequency. I'm actually not sure about DSD as the 9039 datasheet does not mention 47K/50K/60K/70K for `iir_bw`. On the signal path there is a "DSD FIR"...

You'll likely need the CH341 drivers, which can be downloaded from Microsoft here: https://catalog.s.download.windowsupdate.com/c/msdownload/update/driver/drvs/2023/05/4163d0bb-8702-4f68-b58b-b7acc2a521b3_9ca4570386a1dc29d482f64e8d4b402c95d61b10.cab Extract and right click on the INF file to...

looks like it on the DO400:

I flashed the latest firmware and it seemed to me that they fixed the filter labeling. Fast filters were fast (roll off before 0.55 Fs) and slow filters were slow (~0.8 Fs) but I was unable to get proper impulse responses measured to verify if minimum/linear phase was correctly labeled. EDIT...

It’s interesting how they sanded (lasered?) the Mornsun brand name off the PSU… Just switch to Mean Well at this point

https://www.l7audiolab.com/f/mbp162021/ Measurements of the MacBook Pro 2021 headphone jack by @WolfX-700 show room for improvement (borderline audible) in the THD department but otherwise the MacBook Pro headphone out has excellent performance (noise, dynamic range). 3V RMS could be a little...

the D50 III?

Track 1 Silver Dagger on Joan Baez (1960) has a -5.9% DC offset and does trigger the protection on my ADI-2 DAC.