X1 has three levels of system, base has 6 speakers, HiFi has 7 and the HK has 12.
I wouldn't bother with any of them and look for after market, even people with the HK setup say its poor! Plus you cant just swap one to the other.
If you replace the subs, they will go from 6'' to 8'' with a better sound output, lots of plu and play versions out.
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