How are you interfacing the external sub to your system. Are you using a line out converter or direct connect?

The problem is in the hs2 hardware. It has a single audio amp and in that it has three speakers wired in series as one speaker. I'm not sure how well adding an external sub will work in this configuration. It could probably be done if you splice the cables from the audio speaker out at the sound board and Y it off there.

We can probably make u a one off direct feed from the sound board. I would customize one of my current headphone plug in boards to give you a 3.5 mm connection to go right to the sub. Let me see what I can do.

You might want to sell these anyway. A person could hook up a $15 2020 amp and bypass a broken sound board

We just designed board for stern Sam board direct audio feed for a powered subwoofer hook up that will be for sale in a few weeks. it will come with every stern headphone kit I sell and we will sell just the subwoofer connection separate if desired

When I connected my Getaway to a Polk sub, I was quite underwhelmed by the result, given how much I love The Getaway, ZZ Top, and bass.

I say the same thing about lord of the rings... Stern really stepped up the quality if their audio files when they went to the Sam board system. Bass in iron man is amazing.

My LOTR is noticeably amped since I put it and the SG next to it on a Polk sub, but if your board enhances it more, count me in!

Though SM and BK2K are probably my favorite two with more bass. Gorgar actually hits really hard too.

I had the regular PinballPro speaker system in mine and it is totally worth it. The big woofer upgrade is probably overkill but I highly recommend aftermarket speakers. I put the stock speakers back in when I sold it and LaGrange sounded tinny and weak.

Flipper fidelity will work, have one in my bsd, which I assume is wpc89.

I hooked it up a couple months ago on my Getaway and didn't notice the issues you were having. And in fact, I thought it sounded good. Especially the engine revs. I used the alligator clip method to connect directly onto the leads of the cabinet speaker. It sounds like you disconnected the cab speaker? I hadn't done that on any games I added the sub to. Alligators every time.

Has anyone hooked up two pins at the same time? If so, how does it sound?

It's probably ok. You use left channel for one and right for other.

We've hook three pins to one sub

That's what I'm thinking of doing. But if two different signals are going to the single sub speaker, will the speaker recoil be able to reset itself for the next beat, or will it sound like a muffled fart?

This is no different than having two separate channels for input

"Has anyone hooked up two pins at the same time? If so, how does it sound?"

I have HSII And Dr Who sharing the same sub, with great response.(Polk PSW110) If you aren't getting the response you are looking for from one of the machines, reverse the connections at the factory woofer. I used alligator clips at the factory speaker. Only change one thing at a time, test it well between each change.

I had the same issue at first with my Getaway. Here's how I made my cabinet shake.

1. Disconnected the original sub
2. Hooked sub speaker wires to line-in on the External sub (In my case i cut the sub in half and mounted the sub speaker in place of the old sub) then mounted the amp in the cabinet. At this point you will have very little sound.
3. Hooked the original sub speaker backup using the line out from the external amp. OK maybe alligator clips is easier.

Sorry about the pictures, not the best.
3 pics - sub-woofer, amp with speaker wire in and out (look close you can see original speaker in back of cab) and sub sound controls

I love it.
Waldo

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I wrote this guide a while back also
http://pinside.com/pinball/forum/topic/how-to-add-a-cheap-sub-under-40-that-sounds-awesome-to-your-wpc-game

We're testing two and three games at one time on one sub. Might make a adapter if it works good

I'm in for at least 5 of these. I find tapping into the existing sub with alligator clips to be okay and want a more direct method, which I feel will make things quite a bit better.

If only one pin is making sound at a time, it won't be any different than if you had a dedicated sub for each pin.

If both pins are playing sound at the same time, the maximum loudness for a given level of distortion will be lower for each pin. In other words if one pin could have a max loudness of xdB, the max loudness of each pin playing at the same time would be less (I'm guessing about x-3dB, no worse than x-6dB). However since I wouldn't expect the subwoofers to be operating anywhere near their maximum level (you wouldn't be able to hear the sound from the backbox), this shouldn't be a concern in reality.

Summary: there will be no sound quality difference between two pins sharing a sub and one dedicated sub for each machine.

Correct!

Thanks for your input, i will hook up my hs &hs2 to the polk this sunday. Alligater clip method. Ill let you guys know how it turns out.

Why not solder the wires directly instead of using alligator clips for a more reliable connection?

Hooked it up and WOW! HS2 has a deep rumble to hit that vibrates the floor. HS is good too, but nothing like HS2. The wife hates it, so I know its great! lol

If I decide to sell it the pin and I'm pretty sure I would want to keep the sub, it would be a easy disconnect.

I can clip the wires faster than you can squeeze the alligator clips
Enjoy~!

I don't get all the fuss...there is a volume control and a bass filter control. I have 5 subwoofers on various newer pins and all sound much better than without.. Turn the volume up on your pin where the mids and highs sound good , then adjust the ext sub volume until its balanced correctly and sounds right. I have subs on DE , JJp , Williams and stern as well as sega . No issues , all hooked up the same way. Run lead wires off the existing cab woofer and into the sub ,,,easy stuff.....and replace all of those old 20 year old speakers with 4 ohm car speakers. The backbox speakers with 4 inch or 5 1/4 2 way speakers , and the woofer with a 8 inch subwoofer 4 ohm....good luck and let the good times roll