Why you need the Celestion G10 Greenback Guitar Speaker, 8 Ohm: This speaker was designed to capture the legendary sound of Celestion's 1970's 10s - a 10" speaker with a surprisingly meaty tone. • Low in output but with the weighty low end balance of a 12", the G10 Greenback features a complex, creamy mid range and smooth, vintage top end. • 10 inch ceramic magnet speaker available in 8 or 16 ohms.