Can anyone identify this Ampeg 4x10 cabinet. I bought it used at a music store and it had no identifying features but a metal Ampeg symbol on the grill. It looks old and is covered in black tolex. The top two speakers are angled back. I tested the resistance at about 8 ohms. No serial numbers or anything. I pulled one speaker and it is the square magnet type. No identifying marks. Sorry for the poor picture quality. By the way, the thing sounds great. I would like to know what kind of power rating it has and/or the model. Any help would be appreciated.