The hu has the bass and treble control from -5 to +5 range but i fixed at bass +5(max) & treble +5 also.
But the output i should said treble is acceptable and the bass are dispointed. Some forum quoted as source are weak in bass . Need more opinion instead of spend the money to testing.

In the case of change the hu, any user can share, what model in 2din is better...
Maybe budget below 1.5k, also consider of nissan promotion of trade in to clarion cx501a; not to void the new car warranty and add 2 years additional warranty to new hu.

Any good Suggestion ? Thanks.

The speakers in sylphy like typical OEM is really low in quality. It is rated 30watts max so my guess is that the HU is also rated the same.
If you want better change the HU and the speakers.