Power amp query

[bob o]

Hi guys. Wanted to know if it power amp would make a significant difference to performance

Currently my setup is yamaha rx-v775, b&w 683, 685, htm61

What I wanted to know is, would it be necessary as I know power amps are quite pricey.

Further 99% used for movies

 

[scrarfussi]

 

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[Vaughan]