A few years back I bought a Roland KC100. It also had a bad rattle with any sounds with any low frequency content and that was even at low volume settings. It wasn't the power amp or speaker but the ported enclosure that was the problem. I thought it may have been just a one off problem. I took it back and exchanged it for another. It had exactly the same problem. The store would only give me store credit so I just exchanged it for a powered PA cabinet they had in stock. If it hadn't been for the rattle the amp would have been just fine for my needs, but I guess it wasn't meant to be.

It sounds a lot like the problem you had with yours.

Roland really do make some great gear but I would be reluctant to use the KC keyboard amps again. I have to think there are some design flaws that have been overlooked.


[This message has been edited by Nigel (edited 03-02-2008).]