[Rich123]

Does anyone have any suggested DIY upgrades for these speakers and any suggestions for a replacement amplifier for the 210i subwoofer.  The sub has two 8" 8ohm drivers.  Their marketing say 10" drivers, but my tape measure says otherwise.

[Phil A]

Perhaps look at Parts Express?  https://www.parts-express.com/ss_category/Speaker%20Components,Speaker%20Components%3ESubwoofer%20Plate%20Amplifiers?keywords=subwoofer%20amplifiers&oq=subwoofer%20amplifers