Hi Powderdocter, I have had my MG-20's for over 15 years, along with hearing numerous 20's and 20.1's setup in many different systems. Before you spend money on subwoofers I would recommend at least to possible changes that would dramatically effect the performance of your 20.1's to a much higher level:
1) I have never heard 20's or 20.1's really perform up to their ultimate ability without biamping with an external x-cross over. The whole speaker is effected, however the bass extension/power on the bottom end also really becomes much better.
2) Read my GON review of the Mye Sound stands for all the details regarding the astounding impact on the overall sonic performance of my 20's, along with the best bottom end kick I have ever heard from my speakers.
1) I have never heard 20's or 20.1's really perform up to their ultimate ability without biamping with an external x-cross over. The whole speaker is effected, however the bass extension/power on the bottom end also really becomes much better.
2) Read my GON review of the Mye Sound stands for all the details regarding the astounding impact on the overall sonic performance of my 20's, along with the best bottom end kick I have ever heard from my speakers.