There's not much you can do on the 550's end. It mostly will depend on the amp you use. Regardless of which amp you're using you're hear some noise. It's not so bad that it drives you crazy... You'll mostly notice it if you use the 550 to record to say a digital multi-track recorder. I do agree with you in that the 550 is a great keyboard for the money It amazes me that they packed so many features and good sound quality into an affordable instrument. My beef with the tweeters has been cleared up thanks to Steve. I was used to other models I owned that had quite responsive tweeters.

Squeak