- Brand: sunn - Model Name: concert bass - Controls: volume, bass, mid, treble, brite - Handle: Leather handle - Condition: Used Thank you for viewing. This is a sunn concert bass amplifier. I am reluctantly selling it to organize my equipment. I used it often in live performances and it worked without any problems. It has a very powerful vintage sound. There is some crackling, but it was not an issue. The power cord has been modified to be external. Please check the photos. Thank you for your consideration.