i've used a 215b cab for years. recently i bought a hartke head as my mid 70's concert bass fried completely. what i need is info on a sunn 610 cab. i saw one about ten years ago with the speakers loaded 3x3 side by side at an angle with a center port running the entire height of the cabinet at a music store. it may have been a guitar cab reloaded with bass speakers but it had a bright bitey tone to it and the older silver cloth and black/silver sunn logo. it would sound great with my 215b, and was the same dimensions (as near as i can remember anyway). i hesitated and sosmeone else bought it. i've seen alot about 610l and610s models for guitar, but this one definately handled the bass very well. any info would help, even if you have or know dimensions to build my own.