Does anyone know what the Frequency Response is for the stock speakers and FF ?? For the 4" backbox and 8" woofer ??

LOL, I was debating on some Dayton Audio from parts-express.com... I wanted to see how the prices compared to FF...

Sweet, thanks for the info markmon Please link your huge "how to" once you have it pls...

Thanks for the info all

I think I am going to upgrade the sound on my TRON Pro soon...

I am going to pick up the Dayton Audio SA100 100W Subwoofer Plate Amplifier (http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=300-802&scqty=1) that markmon recommended.

I am looking at these Polk Audio DB401 4-Inch Pair Coaxial Speakers (http://www.amazon.com/gp/product/B000P0R6GQ/ref=ox_sc_act_title_2).

And debating on one of these two 8" woofers:
Dayton Audio DC200-8 8" Classic Woofer (http://www.parts-express.com/pe/showdetl.cfm?partnumber=295-310)
Dayton Audio DA215-8 8" Aluminum Cone Woofer (http://www.parts-express.com/pe/showdetl.cfm?partnumber=295-332)

I know that the 100W amp will provide the largest improvement but was debating if I should upgrade the speakers over stock. Would I notice a big improvement with what I have selected above ??

Reply from markmon:

The amp is overkill on tron. On acdc you have a 12" sub that the 18 watt amp, running 12 watts due to 8 ohm load, just cannot handle. On tron, a cheap 8" 4 ohm sub, inductor, and lpad is all you need. The internal amp can handle an 8". Also the stern 8" really suck and need to be swapped out. In the acdc prem, the 12" they provided was decent but under powered. You could buy a FF or pinball pro sub kit for this or build your own for half price.

If you build your own, you need three components. And this will work for any stern:
1) improved 8" sub. These work well and are under $20 shipped. They're decent and super efficient. Even though they are 8 ohms, the extra efficiency more than makes up for the impedance. http://www.amazon.com/Pyramid-WH88-8-Inch-Power-Subwoofer/dp/B000CQEIZ0/ref=cm_cr_pr_product_top

2) a 5 mH inductor is a good crossover. This will cut all the ugly mids from the sub letting it just crank bass. Just wire inline on the + terminal of the speaker. Wire to one end of the coil, other end to the + term of the speaker. Not directional. This $14 part will do: http://www.parts-express.com/pe/showdetl.cfm?partnumber=255-060

3) a vol control so you can lower the backbox volume increasing the bass. This lpad will do. It's under $10 and has wiring instructions on the box. To wire it you will need to solder the speaker input wires onto it and run new wires from this to your backbox speakers. http://www.parts-express.com/pe/showdetl.cfm?partnumber=260-250

3a) if you don't want an lpad you could just reduce the backbox with a resistor. A 30 ohm matches my taste. This is easier to wire than an lpad and is cheaper but it doesn't allow any flexibility. To wire this just put it inline on the + term of your speaker. The trick is in how the right speaker is wired. You'd have to make sure the resistor is used before the right speaker to pad them both. It's actually easy though. This option is about $1 compared to the lpad and is generally what I use http://www.parts-express.com/pe/showdetl.cfm?partnumber=004-30

markmon, You have linked to different subwoofers above...

Legacy LWF8X - "L" Series - 8" 300 Watt 4 Ohm Car Audio Subwoofer
(http://www.amazon.com/Legacy-LWF8X-Series-Audio-Subwoofer/dp/B000060NXK/ref=cm_cr_pr_product_top)

Pyramid WH88 8-Inch 250 Watt High Power Paper Cone 8 Ohm Subwoofer
(http://www.amazon.com/Pyramid-WH88-8-Inch-Power-Subwoofer/dp/B000CQEIZ0/ref=cm_cr_pr_product_top)

I checked my TRON PRO and it has a 4 Ohm stock...

I was reading the Product Description on http://pinballpro.net/shop/stern-late-sega-pinball-machines-swtr-4/ talking about "Kits using 4-Ohm automotive speakers can cause overload to the amplifier if run in parallel (2-Ohms) or lose 2db of high frequency sound if run in series. Don’t risk damage to your sound card with kits using 4-Ohm speakers."

I was also curious about the http://pinballpro.net/shop/high-energy-upgrade/ which has a 50% larger magnet...