You've stated elsewhere that you have an approx 65:35 ratio of time spent listening to Music versus watching Movies & TV.

Given that distribution, there are many here who would voice their experience of changing D5k5's for D6k's... especially for Music.

Even better if you choose to jump up to D8kv1 or v2's.

Money spent there will offer you musical benefits right across the spectrum as well as improving the overall seamlessness of the musical performance achieved.

There are a few D6k's knocking around usually and would be worth considering as opposed focusing on Sub's which really only come into play for Movies.

-