The first outing with my modified CAD GXL1200's was a huge disappointment.
They both sound very, very thin. No bass at all. I haven't run a spectrum analysis yet, but I'm guessing that everything below 120Hz is gone. I ran them within inches of my C-463s into the DR-680 and the difference is huge. AKG's sound warm and round. GXL1200's extremely thin and tinny.
There must be a problem with one or more of the values of the components I swapped out.
I ran them twice yesterday. First at an acoustic in-store The Gracious Few performance and then later that night at the Black Sheep. I ran them into a Busman UA-5 at the in-store and got the same extremely thin sound. My C-481's sounded great on the same mic stand at the same event.
I'm not really sure how to proceed on figuring out what is wrong. If one of them had an issue, it would be easy enough to just examine all of the components and figure out what the difference is. But, they both sound the same, really bad.
Edit to add:
Short samples:
TGF_GXL1200.wav
http://www.filesavr.com/B4gml4FHTGF_C-463.wav
http://www.filesavr.com/UsIL0XV0These links don't work correctly using Google Chrome. They work OK with MS IE. Go figure