Burt,
I can't dream up a photo that would help. Maybe this will;
When lifting my Ampeg V4-B head got to be too much (never mind any cabinet too) I downsized to a combo amp, and ended up with the Fender Rumble 200.
The Rumble 200 seems to accidentally be a fair acoustic amp. It has lots of EQ options, a nice 15” full range bass speaker, and a functional horn tweeter with an on – off switch. I didn't realize it at the time but it also has some very useful I/O connections for home recording.
I use the “Line Out” to connect to my digital audio interface. This is a nice quiet (balanced) output with a ground lift, just in case you are chasing a hum. You can usually find a way to connect your amp to your interface...a couple of things to consider;
- in general don't use a “speaker” or “ext. speaker” connection. It will be too hot for your interface without a pad or serious care – and – if you run a tube amp with no speaker you screwed up.
- “headphone” outs can be usable, but may tend to be noisy as they will be high output even at low levels, and very touchy.
A “line out” either in 1/4” plug or xlr is what you probably want, with the xlr being preferable if you were shopping with connectivity as a consideration. (my guitar amp has the 1/4 line out, I think it's noisier)
(I also plug my Sennheiser 280s in the “headphones” jack, especially if I am recording an acoustic. This kills speaker output. Any of my acoustics are pretty good (bad sounding) mics. Chuffing speaker output right into the acoustic you are recording, for want of a better term, acoustic feedback. Sounds bad.)
@Caboburt , I got tangled up in my story and forgot one important point / you can see I am using the bass amp just as a pre-amp for the guitar. There are tons of pre-amp solutions out there, and if playing bass is not an issue, an acoustic type pre-amp or amp would almost certainly be better.
All this is based on my current understanding, or lack thereof. If anyone sees anything incorrect or that should be clarified, please jump in.