Williams System 11c Background Sound – D-11581

Price: $175 / $185

System 11C Background Sound Board
Machine Name

This is a direct replacement for Williams Sound board D-11581.  This board is used in many Williams System 11c pinball machines. 

Those machines are the following:

  1. Whirlwind
  2. Atlantis
  3. Bad Cats
  4. Banzai Run
  5. Big Guns
  6. Black Knight 2000
  7. Bugs Bunny’s Birthday Ball
  8. Cyclone
  9. Diner
  10. Dr. Dude
  11. Earthshaker
  12. Elvira and the Party Monsters
  13. F-14 Tomcat
  14. Fire!
  15. Game Show
  16. Millionaire
  17. Mousin’ Around!
  18. Pin*Bot
  19. Police Force
  20. Pool Sharks
  21. Radical!
  22. Riverboat Gambler
  23. Rollergames
  24. Swords of Fury
  25. Taxi
  26. Transporter the Rescue
System 11c Sound Board

Order just the board, or with our option volume knob – See more information here: Pinballpcb Volume Knob

All of Kohout Enterprises replacement circuit boards come preinstalled with your game specific ROMs.  Please be sure to provide your machine name in the text box so your new board will arrive ready to plug-n-play. 

Sound Board Installed in Whirlwind Machine

There are several improvements from the original sound board:

  1. Tone controls were added to adjust the Bass and Treble of the output with two adjustment knobs on the board
  2. An updated amplifier section was added. It provides 2 channels with higher power (Rated at 25W) and quieter output
  3. With two channels of of audio, a second output was added that can be used for a dedicated subwoofer output – this board has a build in subwoofer crossover, so no external components are needed to connect to a subwoofer in the cabinet.
  4. The subwoofer output has its own volume control to control the volume of the subwoofer output
  5. Uses the thicker 0.094″ PCB board
  6. Dip switches for easy configuration
  7. Linear voltage regulators for low noise on the audio section

Each board comes complete with a manual that includes instructions, parts listings, schematics, and a board layout drawing.