Q: Do you notice any other lights flickering with the sub beat? You may be looking at current/voltage drop from the sub draw - might consider a large capacitor for the sub, and possibly upgrade to the alternator/battery during the next change. If the current/voltage are pulsating for your lights, all the rest of your electronics in the car (Sensors, computers, etc.) are experiencing the same thing, which often shows up in electronics as accelerated wear.
I am going to install the new stereo and sub next month, we'll see what happens.

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E