How to connect passive subwoofer to Sony STRDN1080

Oct 20, 2018
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I have a Sony 5.1 speaker set with a passive subwoofer that I would like to connect to a Sony STRDN1080 AV receiver. I have all the speakers connected and get sound through those but there is no connection for the wires of the subwoofer, only 2 female RCA connections, one of which is to be used according to the receiver instructions. To achieve this, I bought a speaker wire to male RCA connector but the subwoofer does not appear to work. When I run Easy Speaker Set Up on the receiver all the speakers produce sound, but only a very faint sound is coming out of the subwoofer and as a consequence the set up fails. I may be wrong but I think this is because it is a passive subwoofer and the connection I'm using is intended for an active subwoofer with its own amplifier. As I don't really want to buy a different subwoofer, what are my options? I have heard you can buy an external amplifier but I have no idea how to connect this? Could someone please help me, bearing in mind I know little about audio equipment? Is the idea to buy an amplifier with its own power supply, connect the wires of the passive speaker to this and then connect the amplifier with a male to male RCA cable? What amplifier and cable would be recommended?
 
Oct 20, 2018
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Thanks for the quick response. I bought a nobsound amplifier https://www.amazon.com/Subwoofer-Amplifier-Receiver-Integrated-Audio/dp/B07942M4MC/ref=mp_s_a_1_3?ie=UTF8&qid=1540217589&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=nobsound+subwoofer+amplifier&dpPl=1&dpID=415bpTrR-JL&ref=plSrch. However not sure how to connect this to the AV receiver. The connection on the AV receiver is a single female RCA and I thought this would be on the amplifier too but this appears
To be an audio jack (3.5 mm?). Will this still work and what cabling will I need to connect the receiver and amplifier? I don’t think there are any audio jack to single male RCA, they all appear to be audio jack to 2 male RCAs?
 
Oct 20, 2018
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No cable included. Also all the 3.5 mm jack to RCA have 2 Male RCA plugs at the other end. Does that matter? I’m only supposed to connect 1 Of the 2 RCA subwoofer connections on the receiver. Will it work if I only connect one of the 2 RCA connectors and which one should I connect? Red or white? (Sometimes they come as red an black). Don’t have the cable yet. Someone on Amazon told me that using this set up blew up the amp so I’m a bit nervous about this!
 
Oct 20, 2018
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Thanks for your help. This worked. Connecting both male RCAs to the AV receiver. Then ran the Easy Set Up Callibration and the subwoofer is working as expected! Thanks again.
 
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