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The connections are pretty straight forward, but it will depend on what amplifier you're driving them with. Normally, I'd connect the two TR to one side of a stereo PA amp and the two MR to the other side. All four cabinets are rated at 8 ohms, so running tow parallel per side would give you a 4 ohm load on each channel which would be a common load for most stereo PA amps.
However all this would depend on your gear and what you need to accomplish. If what your question really meant is how do you connect all 4 to one channel, you can't as in most cases the total impedance would be too low and you'll fry your amp.
If you can be more specific about your system we could be more helpful.
Looks like it takes regular home theatre speaker wire. If this is a powered speaker (like a JBL eon g2), then all you need is a passive mixer, and connect the speakers to the mixer. If this is not a powered (amplified) speaker, then you will need an amplifier to boost the sound source and drive the speakers, so you would connect the mixer to the amplifier, then the amp outs to the speakers.
Make sure your audio interconnecting cables are XLR or TRS balanced lines. Use of TS cables similar to guitar cables with only two conductors (only the tip and the sleeve) reduce the gain 6 DB and contribute to hum and noise.
You need to have the speakers re-coned. Unless they are really really good speakers this will cost you almost as much as new ones. A JBLauthorized repair facility should be your next call. Replacing them is probably the answer
Yes you can as long as the speaker impedance when paralleled doesn't go below the rating of the amp. Marshall seems to hide their design lowest output impedance. Possibly you can find that in your owner's manual. Then find the impedance of the JBL. If half the JBL impedance is equal to or greater than the lowest impedance the Marshall is rated, you are fine to use it. The speaker Watt rating should always be bigger than the amp rating which it is in this case.