I just wanted to know if it were possible to use an Egnater Renegade head with a Line 6 Spider IV cab seeing as it has the dual inputs (the cab)?
Yes it is. Doesn't matter which input you plug into.
Squier Strat
Behringer Fuzz
Only if they are stereo inputs that split the cab into two halves. If it's just two parallel inputs you'd have to rewire it.
Gilchrist custom
Yamaha SBG500
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100

Cathbard Amplification
My band
Alright, thank you guys! I didn't want to go out and buy this head only having to go buy a new cab as well shortly after.