I remember from my brief listens that I preferred the E5000 for the reasons you said being that the E4000 was a bit boomy, The E5000 had an amazing balance to that bass with its mid-high frequency clarity. I was so tempted to get it... but the price jump over the E4000's...
To my personal opinion E4000 and E5000 are two totally different beasts, they don't offer me the same emotions - beyond technicalities. Which is a complicated / long way to say that E5000 is not the "upgrade" to E4000.
Imo:
- E4000 is more "personal". It definitely adds a sort of "global colouring" to music, in the good sense of course. I underline global as yes you may call its basses a tad too beefy at times, its highs are lacking detail big time, and its mids can be called a tad too forward or even "too lushy" if you really want to be nasty. But, the ensemble is kind of liaised accross - I don't know how, but it is - offering an "integral sensation" rather than a collection of separated impressions one for the subbass one for the midbass etc etc.
I tend to say that E4000 is an orchestra conductor - i.e. an individual that makes his something out of the skills of each single player in the orchestra - with great ability and most of all a unique pathos. - E5000 is also an orchestra conductor (that is a general Final-E trait), also greatly skilled, but its personality is much dryer. It's like one of those conductors that give impact to the various voices but purposefully trying to keep tempos and accents as adherent as possible to the written penthagram. In addition to that, its orchestra features some arguably better individualities (sub basses and trebles).
Going back to audio: I have both. If I had to keep just one, rationally I would have to keep E5000 as it gives a more "neutral" result on more different genres. But my heart would ask for the E4000.
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