Vox AC15C2 15W Valve Combo Greenbacks 2 Channels - 2x12"The Custom Series AC15 amplifier is now available with two 12Celestion G12M Greenback Speakers. This new AC15C2 TWIN (as it was affectionately referred to in the 60's) enhances the full, chimey sound of the traditional AC15C1; and also features the larger spring reverb tank found in the AC30C2. Based on the classic AC15, the AC15C2 TWIN is part of the VOX Custom Series line. These amps have been updated to include dual channel sound, tremolo