I like to improve the sound of my pins through simple reversible
upgrades. (By reversible I mean being able to undo them without
modifying the machine)

There are two steps that you can take.
  1. Upgrade cabinet speaker with a subwoofer
  2. Upgrade backbox speakers

At a minimum I would upgrade the cabinet speaker.
To do this you need to acquire a hi-lo converter. These are
available at your local auto sound store.

I prefer to create my own connectors. You can cut into the existing
wires if you so choose.
Pinball Sound
  • The first step is to crimp some some terminals onto speaker wire. Make
    sure the speaker wire is long enough to reach your hi-lo converter. As
    shown here:
  • Next you'll want to insert these terminals into a connector. The picture
    shown is of a WPC95 sound board (also the backbox speaker connector
    is disconnected...disregard this). The WPC header pins are almost
    identical. I like to push this connector up though the bottom of the cabinet.
    There should be a round hole covered by a screen like material. This can
    usually be pushed up slightly. Push the connector up though this hole and
    route it up into the backbox. Then connect this connector right into the
    sound board.
  • Then you'll want to connect the other end of the speaker wire into the hi-lo
    converter.
  • Then you'll connect an RCA cable from the hi-lo converter to the powered
    subwoofer.
  • At this point you can fine tune your powered subwoofer by adjusting the
    volume so it balances out with your backbox speakers.
Subwoofer Upgrade
Backbox speaker Upgrade
  • Start by creating a connector as we did with the subwoofer upgrade.
    Route it up and connect it to the sound board. You'll also need to route 2
    pairs of speaker wire into the backbox as well.
  • Pick up a pair of backbox speakers for your pin. The easiest way to do
    this would be to buy a set from PinballPro. Mount the speakers and then
    connect the a pair of speaker wire that you ran up with the connector to
    each speaker.
  • Then you'll want to connect the other end of the speaker wire (the wire that
    is connected to the sound board) into the hi-lo converter.