EMINENCE EJ1250 12-Inch Signature Guitar Speakers Eric Johnson, George Alessandro and Eminence have teamed up to create the EJ1250, a 50 watt alnico guitar speaker that delivers amazing vintage tone. Featuring both American and British characteristics, the EJ1250 has punchy lows, warm throaty midst, and a Nominal Basket Diameter: 12", 304.8mm Nominal Impedance: 8 ohms