I just got a '72 Ampeg SVT. On the back it asks for a four ohm load from the main output and a four ohm load from the extention speaker. Does this amp want to run at a two ohm load? and if it does want to see a four ohm load, do I run cable from my first eight ohm speaker to my second or will i be fine running both from the main and ext speaker outs? sorry for the ignorance and thanks in advance.