Extension Cab help

Hi there,

I have an Ashdown Electric Blue combo, 180W w/12" speaker.
It serves me well, but i'd like to get an extension cab to go with it. I understand all the ohms stuf because im an electronics student. However on the back panel it says "Minimum 4ohms out", but im unclear as to what they mean by minimum.

Can i buy an 8ohm cabinet, or do i need a 4 (or even 2) ohm cab.

Could someone please set me straight?

Cheers
-Lorry


p.s. - im looking to either use the Ashdown MAG 1x15 or the 4x10, so i can expand at a later date.

 

Okay cheers, i'll look into the Ashdown MAG series cabs