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There are 2 areas of sound to consider: games sounds like music and voice, and table sounds like the flippers and ball rolling around the Playfield. Some of the newer games have enhanced media that provides the tables sounds through 2 channels of a 7.1 set up. This means that with a single 7.1 sound capability you can provide the source signals for the games sound and the table sounds.
I had a very old surround sound amp and speakers in the loft, so I removed the sub-woofer and 2 of the speakers for use on the table. A cheap 2.1 MosFet amp from e-bay provides the amplification for the games sound through these 3 speakers.
Another 2 smaller amps feed the table sounds: one at the front and one at the back. Each I connected to right and left Exciters mounted on the sides of the wooden cabinet. Exciters are a special type of speaker that use the material they are mounted on to provide the vibration rather than trying to vibrate the air. Not only does this sound realistic for table sounds like the rolling ball, it also provides subtle feedback as you play, enabling you to feel as well as hear the flippers and buffers in operation.