Not all recordings seem to have the same bass level. I mean, what seems right to me, for that material. So I do change the volume. It's a db scale on my remote app so within about a 3-5 db range I find seems "right" in 90% of recordings. Others set and forget. As far as locating the sub that's a multi-faceted solution. I find I can locate the sub at around 78hz and above so there's that. Volume less impacting to me/my set up.