Review on 🔊 PAC BB-2PR: Amplify Your Audio with Bass Blockers for 6" Speakers by Keith Harris

They completely change the sound in my 2015 gmc Sierra. The factory GM Siriusxm sounds like complete garbage in trucks. These bass blockers eliminated the bass and changed the frequency so the factory Xm sounds like it should. I also upgraded all door speakers to Focal Audio. If you google Sirius and xm radio you will see that Xm is tuned to a lower frequency than Sirius. Yes, they merged the companies, but GM still uses XM tuners. Ford uses "Sirius" tuners, which sound very good out of the box. Xm sounds so clear now! Very satisfied,!