| Yep... I did that back in 2005. I had a Corvette Double Buck 4 string with the optional 30" scale neck. I bought a MEC 3 band and installed it with the hope of adding some useful mids so the bass would cut better. That Double Buck was a very bassy puppy. Full of lows and low mids. After the modification it sounded terrible. The overall tone changed and the mids that I was able to add were nasal and made the tone sound thinner... not clearer. No improvement on cutting in a band setting. I experimented with different settings and different strings for days on end. It never improved. I switched back the stock MEC 2-band and sold the 3-band on eBay. I wrote a post about this on the Warwick forum back in '05 too. If you can find it, it may have more details. My memory sux. All I know is it didn't help on a Corvette $$.
I still play Warwicks... but not $$'s. I have two 5-strings... Corvette Standard (ash with active pickups /active preamp) and a Corvette FNA Jazzman. LOVE the MEC setup in the Standard... HATED it in the FNA Jazzman. Nasal, middy, somewhat thin and useless for modern rock. I read on the Warwick forum that many others felt that way about their FNA Jazzman basses. They all tried to fix it with different strings. I pulled out the MEC pickups and 3-band MEC preamp and went with passive Bartolini pickups and a Bartolini 3-Band preamp with switchable mid centerpoint. Nice! Very nice!! Very punchy and fat and it cuts like a razor. I use DR Lo-Beam rounds on both. Oh, and they are both 32" scale. You would never know it by listening. The tone is wonderful on both of these Warwicks. The MEC pickups and preamp went on eBay.
This probably isn't helping you but that's been my experience with MECs and Warwicks so far.
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Medium Scale Club #27, Fender P-Bass Club #658, Fender Jazz Bass Club #619.
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