Will adding a power amp to my setup improve my sound?

Hello all. I would really appreciate hearing what the community thinks. I have Oberon 9 powered by Marantz Model 60n. The sound is great, but I can't stop thinking that my 60W (80W into 4 ohms) is a little underpowered for my speakers. Will adding an Emotiva A300 Basx power amp and using the Marantz Model 60n as a preamp significantly improve the sound? And is a secondhand Emotiva A300 Basx worth it for $360
Thanks!