One note about 121s. I had a similar thought to Pedrillo. I figured that 121s with a particular subwoofer set-up I had in mind might get the MBL glory with a more neutral tonality (or, at least, a tonality more to my taste). When I pursued this with a dealer who carried both the brand of sub that I was considering and MBL, he had some advice.
Evidently, the 121s have some unique design features surrounding their low frequency roll-off behavior. My understanding is that this was an attempt to optimize integration with MBLs own subwoofer. I'm not sure how it would impact their integration with third party subwoofers, but this dealer told me that his attempts to do so drove him nuts.
I guess the message is: proceed with caution.
Evidently, the 121s have some unique design features surrounding their low frequency roll-off behavior. My understanding is that this was an attempt to optimize integration with MBLs own subwoofer. I'm not sure how it would impact their integration with third party subwoofers, but this dealer told me that his attempts to do so drove him nuts.
I guess the message is: proceed with caution.