For all Glock. lovers, this is a news I picked up on Glock site : !!The 1000 Watt Experience!! We did a technical modification and can release the Heart-Rock Head for a minimum impedance of 2,7 ohms now. That means, it can handle three 8 ohms cabs or one 4 ohms and one 8 ohms cab or our new 6-Box (6 x 10") with 2,7 ohms and in this case, the output-power is 1000 real watts! Heart-Rock users can get this modification subsequent. 1000 W of Glock. sound !