To anyone else still having this issue come up from time to time... Even direct out to my monitors, it sounded dull. I reset all the breakers in my house and everything else suggested but only one thing worked. Usually when something is funky in my daw, I reset the sample rate by changing it to a different one and then back. Thats all I had to do with my Helix and it was back to normal. When I switched back to a specific snapshot it became muffled again and I switched the SR back and forth and it fixed it. I havent had an issue since. I never had this issue come up until I started setting my SR to 96k.