Outboard crossover? Why not?

Although I have read the thread here re crossovers, I am still bemused by my own situation. I bought for my third system 2 Audiovector (Mi5s I think) speakers that the seller said were not jumpable but needed a 6 channel amp. The Mi5s have 3 sets of inputs and I have since bought more Mi5s of "similar 3 input sets" to have a consistent surround set up. The more recent purchased speakers I saw had been jumped by the previous owners, so now  I wonder about the first set I bought. With the first set the seller included an external crossover box and suggested I bought a Rotel 1066 which he said would be very suitable. I bought a 1066 as they are not expensive and so I now am confused as to how to progress. The external crossover situation seems daft as I would surely need 6 speaker cables for the 2 speakers - best presumably all the same - and that would just look silly going into the rear of the speakers. I do have many speaker cables which I would be pleased to find a use for!

Many thanks for all that. It is a price of not really paying attention on a purchase!
As Erik says, the non existence of an internal crossover may not be stated on the back, so what indications can I look for that I have or have not?
Surely jumping can do less damage (Tim thinks so whatever internals??) in any circumstances than triamping, if that is what it is called.? For those who do triamp do they really prefer all those speaker cables?

The seller included an external crossover box (with instructions - good grief!) so  I suppose all the indications are that I do not have internals. It seems I will have to put these as rears unless I invest in a superior multichanel amp, which makes the whole thing so heavy going + all the extra speaker cables. They seem to however be very pleasant indeed speakers from listening to the ones with internal crossovers, It just makes listening so much more complicated having to sit down and read a manual first. I though those days were over! I am taking them all one at a time (odd shaped luggage at 23kg) to my home in Ukraine so I will have time to read up there, as there is not much to do in Ukraine!

Easy - just the two outputs - high and low
As in my earlier post - more complicated , how to work a three input high middle and low on my audiovectors?
Wires everywhere, I don't have the energy to attack it yet.
Has anyone any pictures of a 3 input set up? Showing wires into the crossover and coming out into the speaker?