Hi, a few years ago I managed to blow the speakers on my ashdown mag 300. I have been using the pre and power amp from this unit on a seperate cab but now I plan to replace the speakers on the combo and use it as a a seperate 2x10 cab with a 4 ohm load. I understand that if I put in two 10 inch speakers in parallel, each at 8 ohms this wil reduce the load to 4 ohms. The problem I am now considering is whether to ad a horn and how would this effect the load? I have two bass heads both with a minimum load of 4 ohm and am looking to make a nice portable 2x10 cab, any help would be much appreciated.