i just received my fo 350 and it has the 500/600 driver (no black center) it sounds great the 500/600 all use the same size driver so they probal=bly figured why buy 2 different drivers. besides its the box and the digital proccessing that make the difference on the 500/600 also the 350 still has the 2 round ports as opposed to the single rectangler port of the 500/600. i wish the towers looked the same that would be cool.just my observastions for what its worth.
Jake

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Leave the gun, Take the canolis.