Hi, I know this thread is pretty old but I was brought here because I had the same issue with my HW-M435 soundbar w/ bluetooth sub. Although I did'nt find a solution here that helped, I was able to get my bass back by just removing the power cord from the sub for a couple of minutes and plugging it back in (sound bar off). I know it seems pretty basic but it worked for me right now and I can finally hear the bass just like how it sounded the first day I plugged in this system. Hope this helps anyone else!
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