Hello. I'm modifying my WIIM pro. It already sounds better through the coaxial output (added ceramic capacitors to the power supply, replaced the pass-through capacitor spdif, disabled the optical output, the coaxial output buffer is powered from a separate stabilizer).
Has anyone tried to power the PLL outputs from separate low-noise power supplies? So far I have not found the necessary points. It is difficult to remove the chip and find where the power is connected. Can anyone clarify this point? Thank you.
Has anyone tried to power the PLL outputs from separate low-noise power supplies? So far I have not found the necessary points. It is difficult to remove the chip and find where the power is connected. Can anyone clarify this point? Thank you.
Hi Topaloff, could you let me know how to do such mod? Thanks (added ceramic capacitors to the power supply, replaced the pass-through capacitor spdif, disabled the optical output, the coaxial output buffer is powered from a separate stabilizer).
Hello. This will require skills in soldering small components.
You can simply solder on top of each 0603 capacitor a second one of the same size, 22uF*16V, low impedance. It is necessary to add capacitors on the A98 module and in parallel with the 0805 caps of the DC-DC converter. This will reduce the noise level of the power supply.
You can also replace the SPDIF feedthrough capacitor with a 0402 220pF C0G. Don't throw away stock components so you can return everything to the way it was if you don't like it.
I also moved the 0 Ohm 0402 resistor on the SPDIF to another location to bypass the signal splitter and ran it directly to the spdif output buffer, thereby disabling the optical output.
Adding a separate stabilizer to power the output buffer seemed to degrade the sound a bit. I left everything as is.
The improvements are not too dramatic, but noticeable. I think you can try to connect clean power to the pins of the PLL chip, but it is very difficult. Perhaps I will do this later.
I use my wiim pro with low noise linear power supply and InAkustik Exzellenz coax cable.
You can simply solder on top of each 0603 capacitor a second one of the same size, 22uF*16V, low impedance. It is necessary to add capacitors on the A98 module and in parallel with the 0805 caps of the DC-DC converter. This will reduce the noise level of the power supply.
You can also replace the SPDIF feedthrough capacitor with a 0402 220pF C0G. Don't throw away stock components so you can return everything to the way it was if you don't like it.
I also moved the 0 Ohm 0402 resistor on the SPDIF to another location to bypass the signal splitter and ran it directly to the spdif output buffer, thereby disabling the optical output.
Adding a separate stabilizer to power the output buffer seemed to degrade the sound a bit. I left everything as is.
The improvements are not too dramatic, but noticeable. I think you can try to connect clean power to the pins of the PLL chip, but it is very difficult. Perhaps I will do this later.
I use my wiim pro with low noise linear power supply and InAkustik Exzellenz coax cable.
The next thing you can try to improve the coax output is to short the 220 ohm resistor before the connector RCA, remove the ceramic capacitor parallel to the 75 ohm resistor near the RCA connector. You can also connect the external contact of the RCA connector directly to ground.
Now it seems like it's starting to sound right.
You will get the best results with a quality coaxial cable and an SPDIF isolation transformer.
Now it seems like it's starting to sound right.
You will get the best results with a quality coaxial cable and an SPDIF isolation transformer.
Hello. I wanted to know if you still use the i2s bus to connect another DAC? Do you like it? It seems like an interesting idea. I want to try connecting another DAC and maybe make an expansion board for the i2s output.
Yes, without any problems and I am satisfied with.
Again, typically you need I2s to HDMI conversion board to connect DAC and maybe master clock needs to be converted to double.
Again, typically you need I2s to HDMI conversion board to connect DAC and maybe master clock needs to be converted to double.