Simple low end amp question


I have a first generation Paradigm fully enclosed chamber with 2 bottom firing ports Passive subwoofer.  I wish to hook it up with a far more modern receiver with just a RCA sub out while the sub only connect by wire.  I am told that this sub will need an amp hooked up to it to be able to fully power it and be able to use it like more modern powered subs like the other ones that I own.  Any advice and recommendations of what basic amps that I would need/should buy to accomplish this.  Many Thanks,  Kevin 
ksmcalley
I don’t know your sub so I might be off "bass" here (sorry), but when I can get a powered sub like this that goes down to an honest 20Hz for 300 bucks I’m not sure I’d mess with buying an amp for an old sub...

https://www.ebay.com/itm/302887582892?ul_ref=http%253A%252F%252Frover.ebay.com%252Frover%252F1%252F7...

Best of luck. 
imhififan - Yes this is a passive subwoofer.

soix - Yes I get it, but I just fell into this opportunity really cheap!

timlub - Thanks for the recommendation.

My next question for the collective is:
Do I need a specific subwoofer amp or would a general powered amplifier that also has a sub connection and has the correct connections work.  By the correct connection I mean taking a subwoofer in signal as RCA an have a wire output to the subwoofer.  Thanks, Kevin