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Why not connect an external speaker? You'll want to do that anyway to prove that the internal one is the problem...
I don't think changing the surround will help, and I think you should leave the speaker original...
The numbers don't add up for the choke - cant be rated for 300 mA - 67 mA in 1026 Ohms is 4.5 W - that's too much - better to use a lower resistance choke and a series resistor.
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