https://www.amazon.com/gp/product/B00Q3M9852/ref=ox_sc_saved_image_2?smid=AM0JQO74J587C&psc=1

You could try these as they're pretty good in the ALU 1.1 and 1.2 but they're 8 Ohms which matches what's in those cabinets. If you have an ALU 1.0 then you need 4 Ohm speakers