Monsoon system help
I don't think NOS would be a problem unless the speakers have been stored in the worst possible conditions. All the factory original Monsoon speakers in my '98 (except for one sail panel speaker that I replaced back in 2005) are still original and doing just fine. That car is very low mileage and always stored indoors, but not a climate controlled environment. About ~15 years ago I bought a complete set of factory replacement speakers, just to have them "in stock" for the future (especially because I had multiple Monsoon equipped Camaros at that point), and I've kept them stored in proper climate controlled conditions all this time. If the ~25 year old units currently in service parked in my non-climate controlled garage are still OK, then I have to imagine that the brand new ones, stored in ideal conditions all these years, would still have quite a bit of life left in them.
You might find an aftermarket set from CDT or Kee Audio, they aren't cheap and no, most companies make 2 ohm woofers that size so you probably won't find a set from the big brand names.
If you happen to replace them with 4 ohm woofers of the same size (6.5S), the higher resistance speaker will sound considerably lower in volume than the stock ones.
I suggest you double check the wiring to the speaker and inspect the speaker itself to see if the pigtails are frayed. You can repair it if thats the case.
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Also, doubling impedance does not cause "considerably lower" volume. Given speakers of the same efficiency, doubling impedance results in just a 3dB change in power output, equivalent to about one click of a typical volume ****. Certainly noticeable, especially for subs, but not that big. Volume output is a logarithmic scale so it takes a ten times change in power to double or halve the volume.
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