I have had both plus and original SHL5.All things being equal the difference I hear are as follows:
1) top end a bit more extended and clearer. Enough so that older model is more forgiving.
2) midrange a bit less fuzzy and a bit more snap.
3) bass is where the Plus benefits MOST.Tighter which address a bit of bloat that would a times be present on original SHL5.
4) drivers are more coherent as a result of improvement's.
I will not comment on imaging or staging because those aspects are too subjective.
Next stop 40.2. BIG FAN
1) top end a bit more extended and clearer. Enough so that older model is more forgiving.
2) midrange a bit less fuzzy and a bit more snap.
3) bass is where the Plus benefits MOST.Tighter which address a bit of bloat that would a times be present on original SHL5.
4) drivers are more coherent as a result of improvement's.
I will not comment on imaging or staging because those aspects are too subjective.
Next stop 40.2. BIG FAN