Hate to get rid of such a great cabinet, but am in need of $$. This is the "acoustic friendly" version, and it is in great condition. These are a great cabinet for upright bass, very transparent and acoustic sounding. Has tons of punch and power. This is one of the 1st generation TC112's, and I believe it to be 4 ohms. It also sounds great with my slab basses. It comes with a cover. You can find out more of the specs at his web site: Thunderchild 112 and here: AudioKinesis Thunderchild 112 cab Will ship at buyers expense.