I have read the posts about the Dynamic Filter noise but it appears that on my unit the noise is different between 1 and 2. 2 is a loud steady white noise that I assume is normal based on other posts. But 1 has the white noise plus a loud crackling sound. I have made a sound file. I have normalized the file to -2 DB. 0-5 sec is no dynamic filter. 5-10 sec is Filter 2 and 10-15 is 1. Anyone else experience this?