The 3rd Power Switchback 212 guitar speaker cab with Celestion speaker upgrades produces superior tone and definition. Featuring 3rd Power's proprietar dual triangular chambers, each with a separate removable vent lid, offering you an open or closed back operation. Extended flat frequency response makes the Switchback 212 the ideal extension cab for reproducing the refinded guitar tones of 3rd Power's hand-wired amps. You can get your Switchback upgraded with a Celestion Alnico Gold 12" speaker for vintage tones and just the right amount of chime, or with a Celestion Vintage 30 12" speaker for straight ahead British tones and a "hot-rodded" midrange bark.