The GT12-8 is manufactured by EMINENCE. EMINENCE loudspeakers are the leaders in guitar tone and this particular speaker was chosen because of its added definition for both single coil and dual coil humbucking pickups to reproduce all guitar harmonics. The 1.75-inch voice coil is i deal. Any larger, the high frequency starts to roll off. The high efficiency of 100 dB at 1 watt makes low powered amps sound big, and you will get deafening output form its 100 watt capacity. The 8 ohm impedance will match most amplifiers.