How to connect spekers
If it's your first time in this project, connecting speakers are not simple but you can learn fast. First of all, I don't know the type of speakers you have. Not all speakers are the same, even in sound they're not the same. Some sound superb, others sound just right and many sound like tin cans. Because you have a Kenwood KR-X1000, it looks like you have large speakers. To connect these large speaker you need high quality speaker cables, not cheaper low amp types. Cables for speakers are usually marked with a continuous colored line along one side the cable. This line is an orange color is the cable is 100% copper and is a clear plastic cable (you can see the braided or twisted wire inside), or it could be black plastic with a white or grey colored band on one side of the cable. The colored bands means it's positive side (+). Split the cable ends then splice about half inch and twist the exposed wire. If you have a soldering iron, solder the exposed twisted braids to make it into a single solid wire for easy insertion into the speakers.
Now, I don't know what speakers you have but it doesn't matter, as long as you are aware that there are three types of connections used to connect the wires to the speakers. One type is a snap-on, another type is a squeeze, insert the wire in and let go. This is like a clamp. Another type is the a bolt type with a hole in the shaft of the bolt. The head is usually a plastic but to hold the wire and it is the strongest. Let's say you have the bolt type used by many professional speaker makers and users. You simply unscrew the plastic nut until the hole is open, then insert the wire in the hole then screw the plastic nut back tight. do a light pull test to see if the wire might slip out. Remember that these speaker connectors are colored red and black and the wire with the colored line on sheath is positive, that is it goes into the red connector. Then on the other end of the cable bet some tape or a tie to say this is the left speaker and this is the right speaker, this is the rear speaker and this is the right speaker, so that when you connect them to the Kenwood, you will not have to check which cable goes where.
The same thing goes with the Kenwood wire connection. I am a Pioneer man, I know them well. But I just happen to know that Kenwood and many others are very similar in wire connections because I am close to a store that has these, so, it's easy for me to go there and learn the tricks of trade. However, when I was writing this, it was too late to go down and have a look and the Kenwood X1000. So, I can only say that if you looked behind the machine, you'll find it all easily set and you can't go wrong. The red is positive (+) and black is negative (-). If you have been able to wire the speakers as instructed above, then you are also able to wire the Kenwood amplifier. Split the cables and strip or splice a half inch to expose the stranded wires the twist them and solder to form a solid wire for easy insertion and to stop the little copper wires in the braid from separating themselves from the twisted group. Then insert the colored line of the cable into the positive (red) clamp, clip-on, or screw type connector, whichever your amplifier has. Insert the negative soldered wire into the black clamp, clip-on or screw type connector. Do the same with the others speakers wires, recheck the connections, paying attention to polarities and test. It should work without problems. Cheers.