The Yamaha can only drive powered subwoofers. Make sure that the RTD250 has it's own amplifier built in, you won't be able to easily run it off the yamaha if it doesn't.( the powered subwoofer will have a mains cord to power if it's correct) If it doesn't have a amp built in, easiest weay is to buy a cheap powered sub.
Is the RTD 250 the sub fromthe RCA home theatre pack?
There are two types of subwoofers. Ones that have a built in amp and ones that don't. Ones that have a built in amp (like the one pictured) are called powered sub woofers. You will need a powered subwoofer to connect it to your Yamaha Reciever. (the Yamahas don't come with an amplifier for the sub on board, so no matter what cable you buy the sub will not work. When you get a powered sub, all you need is a standard RCA(phono to phono lead) I like to use the 5m ones for subs so you can place them around the room where you want.
I would throw out the Sub woofer you have unless you buy a separate sub amplifier for it. If you want to go to the trouble you can cut a hole in your sub box and "build" an amp in (Like I Have), but I suspect you will get a better quality result from buying ready made.
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There are two types of subwoofers. Ones that have a built in amp and ones that don't. Ones that have a built in amp (like the one pictured) are called powered sub woofers. You will need a powered subwoofer to connect it to your Yamaha Reciever. (the Yamahas don't come with an amplifier for the sub on board, so no matter what cable you buy the sub will not work. When you get a powered sub, all you need is a standard RCA(phono to phono lead) I like to use the 5m ones for subs so you can place them around the room where you want. 
yes it came in the pack. but no cable, the reciver has a single port and the woofer has a + and - where do i get a cable?
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