Why the woofer moves badly when playing certain LPs

@yeti42, a Townshend Rock 2? Congratulations on your good taste! ;-)  Another of those superior designs ignored by the majority of audiophiles, @slaw (Rock Mk.7) and myself (Rock Elite Mk.2) the rare exception.

Ralph you need to come to my house and I will demonstrate. Most of the bad records are coming from the likes of Warner. The lathe is the only mechanical step in the process now. So it is the lathe by default. When I first got one of these records I thought my turntable was shot. I put another record on, quiet as a mouse. Since then I must have returned at least 20 records for this problem. I may be a bit more sensitive to it because my bass goes ruler flat down to 18 Hz then rolls off at 80 dB/Oct (digital filter). You will notice that Starbusters only notices this with NEW records. Not old ones. It therefore could not be a cartridge tonearm miss match. Until about 10 years ago I had never had this problem. So I am waiting for anyone else to give me a more logical explanation. 

Other than both Starbusters and myself being head cases. Geoffkait, keep your mouth shut.

Ralph the 18Hz is as measured. I use room control.

^^ My speakers are about 3dB down at 18Hz. We're on the same page with that one....