asymmetric apodizing filter

the ps audio pwd and pwd2 have both minimum phase filter and asymmetric apodizing filter along with other combos. i found them very helpful/noticeable with some recordings and not so much with others. am yet to determine any pattern or why. i'm thinking that's why ps audio gives you 4 choices along with an auto mode.

some info towards the bottom of this write-up

http://www.psaudio.com/products/audio/media-players/perfectwave-dac/

cheers

Great read guys. MAny thanks

Hi Glai - I recently uploaded an apodizing filter into my Meridian dac/preamp. To my ears, it is a remarkable improvement.

FWIW, I did NOT upload Meridian's proprietary apodizing filter, although I had the option to do so. Instead, I uploaded an apodizing filter created by an independent programmer.

My decision to install a non-official filter was based on multiple reports from Meridian owners who were less than overwhelmed by Meridian's proprietary filter. They felt that Meridian's filter removed some of the "air" in the recording. I'm just reporting something second hand, so keep that in mind.

I mention this because it highlights the fact that there appears to be quite a bit of variation among apodizing filters. I think it would be interesting if a manufacturer offered multiple apodizing filters in a single product. Maybe that will happen at some point.

Bryon

We can talk about various advantages and disadvantages but it all comes down to your own ears. Some won't like different filters because it's just not what they've become conditioned to. Thirty years of "brickwalls" sets a de facto standard of sorts.

Newer DAC chips, like some of the Wolframs and ESS Sabres, have multiple filter choices on board but the surrounding circuitry and implementation can make a large difference.

Related topics, in a more analog context, might come from terms like "group delay" and "Bessel filters".