Pinnovators makes a plug and play sub adapter. You really only need 1 sub. I have 5 pins on 1 sub no problem using RCA adapters. PM lllvjr here on Pinside, he can hook you up with what you need.

You can search many threads on here about hooking up more than 1 pin to a sub. Here's one to get you started:
https://pinside.com/pinball/forum/topic/which-one-of-these-pins-is-most-improved-by-adding-a-sub

I don't fully understand your question/wording, but all you need to do is connect the PSW-10 speaker level inputs in parallel with the cabinet woofer.

You can connect a second pin to the same sub in the same way using the additional speaker level input channel. (ie - L and R speaker level signal are from two separate pinball machines)

Just piggy back from the existing cabinet sub woofer and connect it to the input side of the Polk. You can run 1 machines wire to the left inputs and then run another machines wire to the right inputs of the same Polk.

Or since you have 2 pinball machines, use one polk for each and just run the wire to either the left or right input on the polk.

Each Polk can handle 2 machines without any special switches etc. If you want to run more than that, then yes purchase the kit from Pinnovators.

None of the above. Don't disconnect anything.

Connect the sub in parallel with the cabinet woofer to either the L or R speaker level input, then connect the other pinball machine to the other speaker level input.

4 wires, two machines, one sub - cheap and easy as can be.

Your better speakers are irrelevant in getting the audio signal to the sub - they will simply (maybe) let you set the sub crossover frequency lower so it can focus on pure bass signals. The signal coming from the backbox being driven by Stern's audio amp is not altered by your speakers and the Polk speaker level outputs are purely an unfiltered pass-thru from the speaker level inputs so you are accomplishing nothing useful by connecting it's outputs back to the machine - you would still be putting it in parallel, just with way more work and headache.

in short - the polk amp is for the polk sub, it does not drive speaker level output.

What about those of us using standard speaker wires, can you hook up more than 2 games? I have one machine + and - hooked up to the L input and another machine hooked up to the R input. How can I add a third?

OP, here's all you have to do to get the sub working on your game with a standard speaker setup. Pictured is the cabinet speaker. The speaker wires with the alligator clips run to the subwoofer (mine is a PSW-10 as well). That's it.

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You need additional hardware to run more than 2 machines on one sub like the Polk PSW-10; it can only take in a single stereo (both L & R from same source) or two mono signals (L from source 1, R from source 2).

If u wanted a plug n play solution for $35 we include a adpater that goes on the sound board and wiring to the sub. Also working in conjugation with flipper fidelity kits that are installed.

All our headphone kits now have the sub out built into the adpater for free as well.

We also will have these for the new spike system at the end of the week.

Just email me if you need any help.
Thanks,
Lorenzo
Pinnovators.com

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Apologies for my ignorance here. When hooking up the speaker wires between the polk and the cabinet sub, are there positive and negative ends I need to pay attention to? I dont want to get my wires crossed and blow anything, if that's even possible.

We can run four on one sub with our pinsmx box. Each input has a isolation transformer protecting the sound board of each game from the others. There is also four potentiometers to adjust the games output to the sub so a game isn't over powered by another game if hooked up to the same sub. $65

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Yes there are + and -.

For speaker level input, you can get it backwards and it won't break or blow anything, it will just sound like complete crap. The wires will simply need to be reversed.

Thanks for responding! I'm going to hook up my 1 Polk sub to IM & Met.

I can tell you first hand both those games are fantastic with a Polk

To clarify - can you run both games simultaneously on the one Sub?

Surely it's just like having a Left and Right input from the same source going into the 1 Sub?

no phase or weird things to watch out for?

also, what gauge speaker wiring have you used from the internal speaker to the Sub? And does this really matter?

Gauge wire at 18 or so, and it is perfectly fine.

I have a separate sub for each game, so that question I cannot answer.

"can you run both games simultaneously on the one Sub?"

Yes. Do it all the time. Sounds fine.

Great, thanks. That'll be Tron and ST going through the Sub tonight then!

Just curious why you didn't wire directly into the alligator clip. In the picture you show the bare wires just clipped onto the speaker with the gators. I normally wire them into the clips and then clip them on rather than pinch the wire with the clips.

It is easier to disconnect the sub from underneath the cabinet speaker when moving pins around. Will be especially convenient
when we move to our new home this Sept/Oct.

If you want mobility,

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Quick question:

What crossover value do you use on the subs for best effect on Sterns or B/Ws?

Usually ranges from around 20-150khz.