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Hello Ykar, could you please tell us a bit more about the power amplifier you are using? I have just ordered the Topping A70pro and I'm planning to use it primarily as a preamp to my Boxem Arthur 4215/E2 Purifi Eigentakt power amplifier.

Depends on what you use it for. The Topping L70 can also be used as a preamplifier (that's what I use it for). The SMSL SU-9 can only be used as headphone amplifier.

I expect very little difference between D70 PRO SABRE and D70 PRO OCTO. Considering the slightly higher THD+N of the Octo, it will also have a slightly lower SINAD. Maybe somewhere between D70 PRO and E70. But we won't hear the difference anyway.

Thank you for the review @amirm! I see you skipped the 'Listening Tests'...

I use the Argon Audio Stream 3. It has FM tuner, DAB/DAB+, Internet Radio and Bluetooth. Output is analog and digital optical Toslink. The device is relatively small and I'm very happy with it.

I wonder if that's also the case with the Topping L70.

According to the Topping E30 user manual you can toggle the auto power on/off function via the 'AUTO' button on the remote control:

I would use the Topping L50 (headphone) preamp for conversion between RCA <> Balanced (TRS). Price has decreased to EUR 170 and I think is a cleaner solution.

USB C OTG adapter cable and printer cable is exactly how I connect my phone to my Topping E30 DAC. Sounds a bit cumbersome but in reality it works perfectly.

Hi Loysius, I see you placed your 803d4s very near to the front wall. That might explain the peak at 40Hz without room correction. Did you consider placing them farther from the front wall? That will change the frequency response without room correction and might improve imaging too.

I just checked and you are right.

See page 10 in the user manual.

Actually, A70Pro can have both the headphone outputs and preamp outputs active at the same time. It's called 'HPA+PRE output mode'. However there are no seperate volume controls. From the user manual:

One thing you always have to check is the impedance ratio: - between output impedance of the DAC to the input impedance of the (headphone-)preamp, and - from the (headphone-)preamp to the power amp. That ratio should be 1:8 to 1:10 or higher. I know that the output impedance of a passive preamp...

Yes, the Topping A70 Pro is better than the Gustard H16. But I doubt one can hear a difference between the two.

@amirm by 96 "kHz" you mean 96 "Hz" right :D.

Yes, you can choose to output both to XLR and RCA. The screenshot below is taken from the Topping L70 user manual:

According to an Amazon review, Topping nowerdays includes a small hex wrench with the RC-22 remote: hex screws are 1.3mm hex.

'Infected' from the album 'Soundtracks Equals Sessions' (2021) by 'Apparat'.

'Virta 1' (Current 1) from the album 'Katodivaihe' (Cathodephase)(2007) by 'Pan Sonic'.