Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: How do I know this sub-woofer is compatible with my Yamaha RX-V661 receiver?
Document: I love this sub!!! I've had it exactly 1 year. I have it paired with a Polk Audio Center (CS20) and Polk Audio floor speakers (TSI-500) and yamaha satellite surround speakers and my home theater sounds absolutely amazing thanks to this sub!! I know that JBL makes great quality subwoofers so I decided to give it a try. People are so impressed with this sub even in my basement with a cement floor this thing pounds my couch.
Real good, I also got a good deal, I have Yamaha 600i stage pass , there is a powered sub woofer out put, so I tried to mixed with outdoor speakers with in door sub, but I only used it for in door, sound great I love it, my friends love it, all of them impressed
Well with a little invesitgating and fine tunring on my settings on the receiver it had turned the woofer waaaaaay down. So like any good music lover i had to turn it up to see what this sub could really do. JESUS this thing just gave me a whole new love and respect for it !!!! To make a long story short I am in love with this woofer because of its performance and look.
ive heard theese guys have a problem withthe amp burning up,  but after almost a month , mine is still going strong.i listen to music as loud as my yamaha receiver will go almost. and this thing sounds good.i have the level turned all the way down, and the cross over turned all the way up. i dont like my bass over powering, just like it to blend into the music. but also be able to feel it. also movies sound great.
bought one a month ago.It was a great deal and the sound was just what I wanted.Because my receiver is 7.2,I decided to by another one.I could not be any happier with this woofer.Any complaints that you read are just idiots.Or people who play music from outer space and don't like speakers from earth.
this subwoofer is great...i am upgrading from a sony 10 inch 100 watt woofer...so this blew me away.i have only had it for a few days but i tested music on itunes a concert on dvd and 2 movies and all i can say is wow.i highly recommend this to anyone.in case you don't know it is owned by harmen/kardon...so the guts and sound are excellent
Considering I am on a budget but I also like great sound this was perfect! I was using a Yamaha 50w 100w peak sub., it did not sound bad but could not keep up with my Integra rcvr. This new JBL absolutely walks all over the Yamaha. Not sure what long term will be like but for right now I am pleased.
I've had this sub for about 3 months now. I originally bought it in combination with JBL main speakers and surrounds, so this rounded out the low end. I have installed sound systems in professional cinemas, so I know what to look for in cinema sound, and JBL is the number one brand.
JBL has been know to produce excellent bass reproduction units & this one carries the torch on. I have these in a 21' X 18' sealed concrete theater room. Walls & floor are carpeted. When watching blu ray movies like transformers & Avatar....... the capabilities of these sub shine.
Therefore, after receiving the product I never bothered to sit down on the floor, turn this thing upside down and peek underneath :). This however butresses the point that I made above.....that its very hard to come across a front-firing non-ported sub these days. Dont know why manufacturers stay away from those. Despite the port, it sounds nice. I have no complaints on that end. But anyways, my apologies for misleading the readers.
Answer: All ur receiver needs is a sub pre-out. So an RCA connection. Plug in to LFE(Low Frequency Effects) on sub.