I have a K210 I bought new. The local guitar store had an RS212. He let me take it home to try and possibly work a trade for the K. He said it is a better cabinet and would sound better. Side by side thru my Ampeg 350w amp with passive and active pickup basses. I had a hard time hearing and distinct difference. Blindfold tests with family members were conducted. Everyone gave the slight edge to K cab. More articulate and room filling sound. It was very close and many times had to perform the test several times for a determination to be made. The K series cost half the price of the RS. I know I was comparing a 10 to a 12 but the 10 had a fuller sound. When I bought the K210 I compared it to Peavy 210. Hands down the K was better. The K sounds good.