Upgrade minicompo speakers

I performed an experiment on a Sony MHC-RV777d minicompo. I replaced one of its speakers with a Pulz Status 203 bookshelf.
It was successful with these benefits:
1. Sound was much smoother
2. Treble was natural. The Sony tweeter buzzes oddly and has a sharp sound.
3. Bass was extended.
4. The Pulz speaker is sensitive and the same impedance 6 ohms as the sony. So the amp was not strained.

Overall the improvement in sound was very apparent. The only drawback is that that it doesn't make economic sense to replace Rs 6000 approx Sony speakers with Rs 16,000 Pulz speakers. Audiophile speakers sound their best only when the entire chain is audiophile.