I have just replaced my synergy F30 with the RP-8000F and the others are correct. These have a very irritating shrill once a little volume is added. I'm using Tube amp or a Hybrid. I have a Vincent Audio SV-500 hybrid, a Willsenton R8, NAD M-51 dac with Tidal streamed from a Node 2i or using Roon with Tidal via USB from PC. Nothing matters. Forget metal..can't be played. I'm going to have to pull out my professional 2 channel parametric EQ and deal (cut) the 8k hertz frequency. Now, in a very large room this is no issue (tweeters) but normal sized rooms and at 9ft away, it's a problem. I also have the Gustard R26 R2R dac..doesn't change a thing. So, it's not in your head, or your receiver.