Hi guys, if you're referring to the Rockability KBV-600 bass amp, I'm sorry to inform you that the company no longer exists and the amps are rarely available for purchase on the used market by chance. Fortunately I was able to buy one and I have to tell you, it puts my other expensive 2000€ amps to shame. I plug in my bass and have a punchy warm deep bass sound like I always want. With my other amps I have to turn the EQ until the sound fits. A great amp, too bad that the company no longer exists, great engineering. For electric bass and double bass the right amp.