[Mike P.]

I was thinking of attaching a rca jack to the speaker cable but not sure if this will work

No, that won't work. The sub is passive, you'll need an amplifier. The Onkyo 507 connects to an amplifier, the amplifier connects to the subwoofer.

 

[Mike P.]

That would only work if the sub has a built in crossover, which I don't think it does. Try it and see, if it sounds like a full range speaker then there is no built in crossover.

 

[Mike P.]

From looking at the manual the subs specs are 3 ohms with a low end cut off of 30 hz. If the Onkyo can handle the 3 ohm load it will send sub 20 hz frequencies to the sub since there is no high pass filter, the sub won't handle that. Your options are to get a plate amp with a 30 hz high pass filter or get a new sub.

 

[Mike P.]

The LG HT903TA was a system that came with the speakers, sub and a receiver. The LG receiver had a built in amp for the subwoofer that was 255 watts and had a high pass filter (rumble filter) that blocked all frequencies lower then 30 hz because the sub isn't designed to play lower then 30 hz.

Hooking up the sub to your Onkyo will be difficult because #1. the Onkyo doesn't have an amp to power the sub and #2. without a high pass filter at 30 hz you will blow the sub.

Do you have the LG reciever that came with the system?

 

[Mike P.]

Yes, that's why I asked.

 

[Mike P.]

The Sony SA-W10 will work with the Onkyo. Connect the sub out of the Onkyo to Input 1 on the sub.

 

[Mike P.]

1. Yes, the Onkyo has more power then the LG receiver so go easy on the speakers until you find their limits.

2. Not sure. I can't find a online manual for the Sony TA-VE110 to see what its outputs are. It would have to have a speaker wire output labeled "Subwoofer" to work with the LG sub.

 

[Mike P.]

The Sony won't work with the LG sub.

 

[Mike P.]

Post a pic of the back of the Sony 110, a close up showing the connections.