How are 4x12 cabs wired?
A 4x12 cab is typically 16 ohms, so when you connect two of them together in parallel, the total load becomes 8 ohms. ... So, for example, if you have two 16-ohm cabs for an 8-ohm total, then set your amp to 8 ohms. You could also use two 8-ohm cabinets for a 4-ohm total load. In that case, just set your head to 4 ohms.
Which is louder series or parallel?
As a general rule, parallel speakers are louder than series speakers. That's because: Wiring speakers in series increases the total speaker impedance (Ohms) load, decreasing how much electrical current (amps) can flow. This means the amp or stereo's power output will be lower.