I think there are audiophile recordings with true stereo bass, seems to me I read about some many years ago, but I didn’t make note of what they were. If anyone reading this knows of any recordings with true stereo south of 80 Hz, I’d be very interested in knowing about them.
I think the question really is going to be, how does this get recorded and mixed? I don't think recording engineers are low passing all tracks and replacing them as a mono element, unlike perhaps movie sound tracks, where the LFE channel can be used for greater dynamic range.
More likely the percussion all ends mixed together and put in one place.
I mean consider a case of a double bass off to the right, and a piano to the left. I've never heard of any recording engineer taking the bass alone and mixing it to mono. Would be very interesting to hear from actual recording engineers.
Having said this, properly integrated, where a sub is physically located should not be discernible.