Hi All, does anyone know of a converter box or something that allows a 15 in 4 ohm speaker and a 4X10 4 ohm cabinet to run out of a 300 watt 4 ohm combo amp. I want to use both my combo's 15 incher and the 4X10 at the same time. I know how to convert the combo to a speaker out/speaker in jack system, allowing me to run either the 15 or the 4X10. But how can I run both the 15 incher and 4X10 at the same time without frying the 4 ohm amp. I think combining the two speaker systems will reduce the impedence total to 2 ohms and fry the amp, true?