I just put a couple of alligator clips on the end of the speaker wire and attached it to the posts. My subs also allow two inputs so I have two pins hooked up to each sub. Easy peasy.

I wouldn't use the non-powered one as that may put too much load on your sound board amp. What Chemixtry said: just make up a cable that goes from your pinball lower cab speaker (alligator clips) to the input on your sub. Adjust volume and crossover on sub to liking. Makes a world of difference.

Mike

You need to have a cable that has the RCA, like in your last pic, for the sub side. Then on the other end you will need the cable split open exposing the center tap wire and the ground (shield) wire. Connect an alligator clip to each (solder or crimp). Run these to the speaker in the bottom of your pin and connect to each speaker terminal. I would solder for best results. Also I would test with a meter to check for proper continuity and shorts prior to hooking up. In this case polarity shouldn't matter. Good luck!

Mike

+1 for the alligator clip method. I got some decent speaker wire, some alligator clips, and then I pass the wire through the bottom after lifting up some of the grating.

Also +1 for making sure your sub has its own power source.

Do you also clip right to the cabinet speaker or disconnect and clip to the wires themselves?

I clip right to the speaker without disconnecting the existing one, and I've had no problems. Anyone care to comment on if this is good/bad?

Yes, that's what you need. But you can save some bucks and just use an old RCA to anything cable and cut it yourself..if you have one. IF not, that link will work. Just add the alligator clips. As far as polarity goes--correct, in this case won't matter which way you clip to speaker. And yes I always leave the cab speaker connected. Just adds some mid-range that might be missing with just the sub and top speakers connected. Let us know how it sounds!

Mike

What do you mean by " And yes I always leave the cab speaker connected. Just adds some mid-range that might be missing with just the sub and top speakers connected."

Above you asked if you connect the sub to the cab speaker wires only or leave the cab speaker connected. Did I misunderstand that question? I just suggested you leave the lower cab speaker connected and clip to the speaker terminals without disconnecting the cab speaker. If you disconnect the existing cab speaker you might be missing out on the mids of the sound output. That's all. Make sense?

Mike

Yes, thanks. All clear.

Polk psw10 looks like it has an RCA input and 2 sets of inputs with speaker wire for the left and right. Should you use the RCA like above or just one channel? Both channels?

Just one set is how I've done it and it works fine.

The RCA inputs are line level inputs. If you are tapping your cab wires with alligator clips, you input into the sub into the speaker level inputs. At least how most of mine are hooked up. WOZ is an exception, as it has a line level RCA output, so I use an RCA cord on it.

Extensively discussed here:
https://pinside.com/pinball/forum/topic/adding-a-powered-sub-the-right-way

Hack up and old RCA cable, add alligator clips, loosen speaker, route under grill.

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