#1
So, basically Im planning on running two 4x12 cabs from one head.

Im just wondering do the two cabs have to have the same wattage?
for example 1 cab being 240w, while the other 260w maybe..
#2
No you just have to get the impedance (resistance) correct or you might blow something up (not really but it will damage your gear). What cabs and head are you running?
Gibson RD Silverburst w/ Lace Dissonant Aggressors (SOLD)
Electra Omega Prime Ceruse
Fender Franken-Jag Bass

Amps and the like:
Laney VH100R
Seismic Luke 2x12
Dunlop 105Q Wah
Gojira FX 808
Line 6 M9
#3
Ive got a Laney TI100 head, its got 2x8ohms (or 1x4ohms), 2x16ohm (or 1x8ohms), and 1x16 inputs.
The cab I own is a fender supersonic 4x12, with 1x16ohm input.
And the other cab I might be using is some crate blue voodoo thing. Its got v30 copies so im happy. With a 16ohm input aswell.
So Im going to connect them parallel I take it? With two speaker cables
#4
Not power, but match the impedances. Don't buy 4 ohm cabs unless you are prepared to rewire them. Two cabs of equal impedances will present half of their respective impedances to the amp when run together. So two 4 ohm cabs is 2 ohms - you don't want that.
Gilchrist custom
Yamaha SBG500
Telecasters
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
#5
Yeah you plug each cab into one of the outputs in the "2x16 Ohm" block.
Gibson RD Silverburst w/ Lace Dissonant Aggressors (SOLD)
Electra Omega Prime Ceruse
Fender Franken-Jag Bass

Amps and the like:
Laney VH100R
Seismic Luke 2x12
Dunlop 105Q Wah
Gojira FX 808
Line 6 M9