I don't think he can. He'd need a new circuit board, and finding one would be next to impossible. Even if you managed to finangle one from the manufacturer, they'd probably charge you almost as much as you paid for the speakers themselves.
Soldering the "foil pieces" together won't work - it'll change the resistance, which will alter the way the board processes the signals. And that's assuming you can manage to get 'em soldered together in the first place - something that I highly doubt you'll be able to do with any accuracy.
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