Hi, Looksike you fixed the problem with your Sub, I was wondering if you have tried the digital filter in Audiolab 6000A. I have the same amp and I found that the filters change the overall sound presentation quite a bit. I found the Slow Filter to be more suited for 'busy' music like Led Zeppelin or The Who. On an aside, some of the Led Zeppelin remasters has issues with dynamic range and compression. I prefer the sound of the older recordings of Led Zeppelin.
Yes. Sometimes, remastering can be nothing like the original recording. I have once heard "Old Love" by Eric Clapton from a remastered CD. Though it was OK, the same song from Vinyl in the same setup was something else. For newer albums from other artists, the CD was much better in dynamic range when compared to corresponding vinyls in the same setup.