Quoted from wayout440:

The design of the game doesn't split frequencies like you are thinking. This is why the cabinet speaker is a midrange speaker and not a woofer. The cabinet just enhances the low frequencies. There is no reason to put a crossover on the cabinet speaker because there is nothing to crossover to, unless you add another higher frequency mid or tweeter to the cab. You don't need an LPAD, unless you want that kind of control - but that would only allow you to lower the volume of the cab speaker. If you wanted to make the cab speaker louder than the backbox speakers, you could use a stereo LPAD for the backbox speakers. If I was just replacing the cab speaker with a woofer, I wouldn't use an LPAD or a crossover, I'd use a low pass filter so that only the low frequencies are passed to the woofer.
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Quoted from Jaketime81:

Jgadzia,
I am working on the same project, here is my setup on my gnr:
1. I bought it with a pinsound board and upgraded speakers, but I knew I could make it better.
2. changed out the 4” speakers with some nice two way coaxials and cnc’d adapters to fit nicely.
3. Added a small power supply to power the pinsound and amifiers.
4. Added a ktp mini sub amp, has selectable 80/100/120 LPF built in, the pinsound output was not crossed over and the factory sub had its iwn LP coil attached.
5. Machined a spacer to raise the new sub off the floor so the suround can move without rubbing and the factory sub grill can be retained. All without any modification to the cabinet so it can all be reversed.
6. Working on bulding a custom topper to add 2 6” speakers in enclosures that look like marshall amps and I am adding a 4 channel ktp amp to powet the 2 up top and the two in the cabinet.
Its all a bit overboard, but I love me some GnR Pinball!!!
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Quoted from durgee7:

Hey Everyone,
Has anyone installed Frank's Famous Lithium Battery Board on their Data East MPU? I bought this board to replace the AA battery holder. Unfortunately, the replacement board didn't come with instructions. I sent an email to Todd at TNT and he responded quickly, letting me know there were no instructions for board install. I know...why would I buy this without having enough background in electronics? Short answer: I didn't do enough research, especially on NVRAM. I have no problem soldering/desoldering boards but want to make sure I install correctly. Just hoping for some guidance.
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Quoted from radial_head:

Hey everybody, glad to join this club.
I picked up a Rocky and Bullwinkle a little bit ago and recently it doesn't boot. I'm sure I'll ask some more specific questions once I get deeper into it, but the main things that are wrong thus far are it keeps blowing strange sets of fuses, has some extremely weird/lazy power supply board fixes (wires jumped instead of replaced blah blah) the P.I.A. light stays on, I could go on.
I'm looking for some guidance and pointers on where to start looking to get some comprehensive training on the design of these games' boardsets. Thus far I've only worked on a couple of EMs and System80 games, and Clay's Guides have helped me out a lot on both of those. I'd love some pointers on where to start looking to learn.
Thanks in advance friends.