I knew the world of guitarists would be confused by us using combi 1/4" + speakon sockets but I didn't realise that a pair of parallel inputs would be so perplexing - I guess I've been hanging out with bassists for too long! ;-)
Neutrik combi 1/4" + speakon sockets
We use these rather cunning jacks (aka sockets) which have a standard mono 1/4" jack in the middle - as used on guitar cabs since the dawn of time. However you can also use a modern Neutrik speakon with them (either 2 pole, the most common sort, or 4 pole - but only 2 poles will connect). We're using them on the guitar cabs for two reasons:
1. We already use them on the bass cabs (because they're the modern standard for higher power) and as they already take a 1/4" there's no downside vs a basic 1/4".
2. Speakon plugs lock - so you can buy/make a speakon-1/4" lead, push/twist/click the speakon end into your Barefaced AVD cab and leave it there for good (there's space to store it in the AVD). Never again forget your lead or have someone else "borrow" it.
Dual parallel jacks / sockets
I gather that a lot of guitar cabs just have one jack input on the back. However almost every bass cabs has two inputs which are in parallel and as we started out as a bass company we just continued that with the guitar cabs.
These inputs are in parallel, which means that you can connect your amp to one (so it's an input) and then connect a second cab to the spare one - the parallel wiring means it acts as an output. This is called "daisy-chaining". If you connect one 8 ohm cab to your amp then the amp sees an 8 ohm nominal load. If you connect a second 8 ohm cab to your first 8 ohm cab, by daisy-chaining, then your amp will see a 4 ohm nominal load (because the cabs are connected in parallel) and each cab will get half of the power.
DO NOT CONNECT TWO AMPS TO ONE CAB. This is likely to damage both amps.
You can also use the spare input/output to take signal off to a speaker level DI like an Avalon U5 for recording.
