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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.

Upgrade cabinet speaker with a subwoofer
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.

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.

At this point you can fine tune your powered subwoofer by adjusting the
volume so it balances out with your backbox speakers.

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.