This board completely changes the pinball playing experience! I just installed it on my JM. I replaced the stock back box speakers for a pair of pyle 5.5 speakers
http://www.amazon.ca/Pyle-PL53BL-5-25-Inch-Three-Way-Speakers/dp/B00022OBO2/ref=sr_1_6
I replaced the stock cabinet speaker with a pyle 6.5 subwoofer:
http://www.amazon.ca/Pyle-PLG64-6-5-Inch-300W-Woofer/dp/B000FMPENQ/ref=sr_1_1
I made my own 2.1 Stereo harness from the directions on Pinsound site.
Installed the Pinsound board in 10 minutes. Would have taken less time because I misplaced my screwdriver.
I downloaded both the Legacy and Pinhead's mix (zip files). Put them on the USB. Plugged the USB in the board. Turned JM on. Waited 30 minutes for both mixes to decompress.
Turned JM off. Turned it back on. Waited 30 seconds. It was the legacy mix, so I turned volume in coin door to 0 and it switched to Pinhead's mix. Raised the volume to 13 on the coin door. Then I adjusted the knobs on the Pinsound board to suit my taste.
Played a game...well actually 5 games...the sound difference just blows you away!
Now I am going to spend the day replacing sounds/music on the USB!
Great product, great instructions, easy installation! Just wish it wasn't $400CAD + per board.