Installing Spade Connectors for stock Rel Speakon Cables

OP you strip the two wires back. Take the stranded wire and part it down the middle in to two separate equal parts, so two wires will have 4 halves.

Twist all 4 halves clockwise BUT keep them separate.

Take two of the 1/2s (one from each of the 2 wires) and twist them together clockwise. Do the same to the second pair CLOCKWISE

Take the 4 that were made into 2 and twist them together clockwise holding the base of the 2 wires very tightly when you do this.

You have just been taught the correct way to mechanically join stranded wire OR the proper way for a single wire to be mechanically prepared to insert into a terminal end. NO MATTER how it's to be secured. 
Crimped
Soldered
Screws

The only other thing you can do is "tin" the end properly for solder or what ever you intend to do. Bare wire usage etc..

IF you want to one up your game, dip the ends in contact enhancer and secure it. DO NOT use contact enhancer when soldering. It's ok to tin the ends and then dip them as long as you don't solder after the application.

Second if you're going to be soldering the ends, be aware of the outside covers getting to hot and off gassing.. Teflon is a real killer..
BE CAREFULL!!!

Armor and shrink tube if you like. Home use I doll them up a bit..:-)
Field work.. THICK THICK Outer covers, pretty is not an option holding up is...

Regards

You may not connect 2 amps positive together directly. That's potentially explosive. :) 

It's OK if a high value resistor is between them (say 1kOhm or higher). 

Not sure what's going on with this cable. :) 

oldhvymec that is very helpful. I'll do that and get a screw on spade. 

erik_squires Rel subs are designed when used in dual configuration, the yellow and red wire from the Speakon cable both go to the positive, the black wire go to the negative. 

@sean1216 that depends if you are using a stereo amp, dual monos, or differential. Which are you using?