Is it Me, the Vinyl or the Equipment?

I just opened and played a Craft Recording of Mindy Smith "One Moment More", which is an amazing LP. There is consistent rumble under the music. Heard most clearly when the song ends. I recently bought Simply Red "Holding Back the Years" from another vendor and the same thing. Is it me, my prime TT with Ortofon Bronze cadenza cart or just the recordings being pressed at the speed of sound to get out to those of us clamoring for new LPs?