Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: are these speakers prewired or can i use my existing wire and use these as replacements?
Document: Speaker wire was included, but I didn't need it with my existing system. After fiddling with the Receiver to set up the sub-woofer and re-equalize the system for the new speakers I was listening to an action movie. What a difference!
This is my first surround sound speaker system that I got to go with a new Yamaha RX-V371 receiver. I mounted the speakers with an inexpensive set of wall mounts. I did use 16AWG speaker wire based on another review. I just picked up some RCA speaker cable from Amazon.To my non-audiophile ears they sound just fine. I have the system setup in my bedroom.
The speakers hang by two screw slots, and are light enough to put almost anywhere. I put my front speakers directly on the wall and my back speakers on shelves so they could be turned into the room.There are only two issues when mounting the speakers, and in fact these are the only issues in general. First, while the spring clips you connect your speaker wire to are big and easy to use, there is no channel for the wire in the back of the speaker housing.
I did not use the included speaker wire, as it is pretty thin. The speakers also look very nice, and look like they cost a lot more. The only negative thing I can say about this speaker system is that the subwoofer doesn't have a standby mode, and is always on unless you manually turn it off. It's not a big deal to me, and I highly recommend the Yamaha NS-SP1800BL 5.1-Channel Home Theater Speaker System.
Honestly, i've yet to find a flaw in these. The center speaker has a great clarity and loudness to it, the satellite speakers are prefectly balanced, the subwoofer is WAY too loud for my apartment (which is a very good thing lol) i just turned it down to almost nothing and it still thumps the living room.I didn't use the cables it came with, (didn't even look at them). i bought some 16 gauge RCA wire instead so i could cut them to length.
I have used both 24 gage and 16 gage speaker wire and can not tell the difference between them except for the price. So if you are on a budget just use the wire and cable that came with the system. The S.S. and center speakers are small but the sound that comes out is very good. The subwoofer is pretty big and has volume control, on off switch and one cable input. The subwoofer really puts out some nice bass sounds. You can't go wrong with this set.
I got about 100 feet of wire, which was barely enough to run my rear surround speakers to the back of the room. The wire is very thin--probably around 20-22 guage. Too thin to use my wire strippers, so I had to resort to the old razor blade around once and pull with teeth technique. In fact, the speaker wire is too thin for the connections on some of the speakers, slipping out loosely instead of being held down by the clamp action of the connector.
The wiring provided is not heavy gauge (probably #18), but it's OK for the system power and for hiding along the edge of the carpet. I bought the RCA 16 gauge cable as &#34;suggested&#34; but I don't regret it. It's a good quality heavier wire that I will eventually use for a neater installation in the ceiling. This one would be harder to hide in the carpet edge.The system sounds great out of the box.
Then I used the test tone from the amp to find out the center channel speaker doesn't work. I'm using an existing bookshelf speaker for center for now.Otherwise, the bases sound fine and rest of the speakers seem more than powerful enough for my tiny home theater room.
The included will suffice until you do so, though. As of this writing, I haven't done so, but I will.This speaker system was inexpensive, but I got what I wanted. I had existing equipment, listed above, that helped make this purchasing decision much easier. Most of the stuff I suggested to make this speaker system better can be had at garage-sale prices.
Answer: They are not pre-wired.  You can use existing wire.