I listened to this carefully. I think there are two components of that sound... the low freq thud and the higher freq tap. Listen closely to the very beginning of #9. The thud is there, but not the tap. The tap comes in after about 4 bars. I think the thud is a bass drum. Not sure what the tap is... maybe a foot.
Well, I listened again and it really doesn't sound like anything any decent musician would add to Clapton's performance. It is not too annoying with an 8" sub, but if I play it using my SVS 12-Plus, it really sounds like crap. I went into another room while track 2 was playing and noticed low frequency noise (maybe like the effect used in a movie to remind us the scene is on a spaceship). Went over to the sub and see a lot of commotion that doesn't coincide with the music. I think that best describes what is happening - it is a music album with LFE! I don't know much about recording engineering, but it seems as if there were no rumble filters applied. The only instrumentation is Clapton's guitar, voice, and foot tapping!
I can say that because I just watched the performance on Youtube:
It is Clapton's foot, but has the sound effect of the Hulk's foot.
I wonder what a 15" ported sub would do with it.
The thud is there on other tracks too. Less prevalent, but maybe because some of the other tracks are busier. The easiest way I found to get rid of the thud, especially since it only bothers you on a couple tracks, is hit "Direct" for those tracks. Gets rid of the thud, leaves the tap. Easy to turn on, and easy to turn back off.
I would consider that an excellent solution...except it makes me feel stupid that I didn't think of it before posting this!
Seriously, thanks! Simple is always welcome!
BTW, Layla on this album is one of my favorites of all time. The piano fill is magnificent.
Yeah, I really like every "unplugged" album I have ever heard (which is only Eric Clapton, Katy Perry, and Alanis Morissette and I'll add Roseanne Cash's
10 Song Demo album). But Clapton is my favorite of them.
That is why I used this album as an example - major musician and actually wonderful quality recording... except for the LFE!