Rwwear and Eldartford are correct, but I'll respectfully disagree with Reb1208. The variability of LP's is certainly greater than with CD's, but to state that, "The 'best' LP's have a compromised balanced sound.", betrays a lack of experience with high quality LP's, or perhaps a lack of experience with high quality LP playback. The best LP's on my system sound balanced, but hardly compromised. Of course I'll freely admit that I may not be entirely 'sane' by Eldartford's standards. ;)
The LP12 is famous for warmth or richness in the upper-bass and lower-mids, which many people find 'musical'. I suspect that's what you're hearing. In addition to the adjustments referenced by Rwwear and Lugnut, you might check that the LP12's suspension is tuned up perfectly. Any looseness or misadjustment there would add to the problem.
If none of this helps, it's possible you've simply outgrown the LP12 sound.
The LP12 is famous for warmth or richness in the upper-bass and lower-mids, which many people find 'musical'. I suspect that's what you're hearing. In addition to the adjustments referenced by Rwwear and Lugnut, you might check that the LP12's suspension is tuned up perfectly. Any looseness or misadjustment there would add to the problem.
If none of this helps, it's possible you've simply outgrown the LP12 sound.