The instrument should serve to replace used already for the third PC, so were quite old PC speakers. That would really have no reason to abolish it, but they began to grumble when they were turned on. This was so disturbing that I have mostly turned off. The problem should be solved with Logitech PC speaker system and it was in an excellent way. The sound is so good that it is a joy to listen to music on the PC. I had it but wait a few days because our TV has also started to hum and can not be switched off, in order to do something else. We had been thinking about buying a new TV. Again the device a complete success and the sound was more pleasant than the TV speakers, as they are not yet buzzed. So now, the second unit was ordered