The G12-412MG is a classic-sounding Celestion with epic power handling Celestion's G12-412MG gives you classic British tone, with enough power handling for today's powerhouse amps. In the 1960s, Celestion's original Greenback speakers helped shape generations of guitar tone and became a staple of modern music. With its warmth and distinctive growl, the G12-412MG serves up the essence of British guitar tone, with low-end grunt complementing its warm mids, crunchy upper-mids, and sweet highs.