I had 2 x RCF J8's, there were a few years old. I sold them, and got two of the Yamaha stagepas.
There is no comparison, the RCF system blows the Yamaha out of the water.
My set up is backing tracks, vocals, electric guitar. The Yamaha on paper should have been loud enough, i wasn't. In fact , the master was up to 10, and the channel was up to 9.....not enough power or punch. The RCF's are better.....by a long way.
I sent the Yamaha back, and got 2 x RCF again. Lesson learnt.
Thank you Thomann for excellent return service 100/100!