LC vs RC filter on DAC output

[davidsrsb]

The pot core types with air gap in the centre are fairly well self-shielded, certainly several orders better than a rod or "D" core types with an air gap exposed to the world

They can be mounted close to each other without cross talk

[regal]

Originally Posted by davidsrsb

The pot core types with air gap in the centre are fairly well self-shielded, certainly several orders better than a rod or "D" core types with an air gap exposed to the world

They can be mounted close to each other without cross talk

Where do you find them?,

There is a DAC I had called the Lite DAC-60 that uses a passive I/V then LCLC then SRPP. I made it a first order LC but could never find a inductor that sounded as good as the big air core speaker inductors, problem was it hummed with those air cores. I eventually got rid of the LC filter + SRPP altogether and replaced them with an anode follower with a cap from plate to grid to increase the miller effect enough to give a -3dB around 50khz, that was the best configuration after trying many different models of shielded inductors. The cap is multiplied by Mu for its filtering so it allows you to use a smaller high quality cap.

I guess what I am saying is for a i-out DAC LC filering is troublsome, not because of the design on paper but because "audio quality" shielded inductors are difficult to source. With a V-out DAC it may be more feasible because the signal is probably less likely to pick up interference.