Hi, I have always played using a combo, but I have just been given a Peavey 450 Tour and an Ashdown 410 cab. I am currently using an Ashdown Mag 300 Evo II. The rear panel on my combo looks like this, with two speaker outputs, one which is hooked up through a cable coming from inside the amp. http://www.guitarmagazine.co.uk/imageBank/i/IMG_27162.jpg Is there a way for me to use the 15" speaker inside the combo with my 4x10" cab and hook it up into my Peavey head? The Peavey runs 450W RMS into 4 ohms, the Ashdown Combo runs at 'minimum load 4 ohms' and the Ashdown Cab is 8 ohms. I don't really understand the whole ohms thing. hope you can help! Tom.