Hello, wondering if anyone knows if a 2121 recone kit will make a 2120 transducer into a 2121. I have a pair of 2120's (rare extended range 10" transducer). Is this the same speaker with different cone, etc.? I'm building something like a 4343 monitor and this extended range 2120 seem a bit harsh so far. You think the 2121 is better suited? I noticed it has significantly different characteristics to the 2120 (see pic). Thoughts? Thanks in advance. Here is the 2120 specs: http://www.jblpro.com/pub/obsolete/2120.pdf