sharp and piercing high pitch /frequency coming out from Harbeth C7

I just had similar and, after trying a different amp, the high pitch ringing went away. I just sent the amp back to the manufacturer to check for problems. 

I experienced similar issues when I made the change from 40.1's to 40.2 Anni's.  Changing the amplifier may help some, but the fix for me was experimenting with placement, most notably toe'ing in the speakers so the tweeters align to cross in front of my listening position, as this minimizes room reflections.  I'm also increasing my room treatments with emphasis on addressing first reflection points and increasing diffusion.

its the amp or the room

not likely the speakers - its garbage in garbage out with speakers

Thank you all for your advice. However, I tried a more powerful Amp with 300 W per channel, the frequency is stronger. I also brought the speakers to another audio shop for testing. The same tracks with the sharp freqency happened on the Sonus Faber speakers too. But the sharp frequency was lessen by the high end speaker cable with filtering so I upgraded my cables too.

I avoid turning on the volume too loud, like just turing it not over "12:00 o’clock". I agree that It might be the power supply and the electricity fuse..... and also the placement of the speakers. I have moved them and they sound better now.

Speakers > amps > CD
Are you sure it's not the CD source?