Hi to all ! I have Warwick Fortress One 5 which came with MEC preamp and also two MEC J pickups... The pickups were replaced with two active EMG J pups... but the preamp is still MEC... Controls on Fortress are : - Volume (with Acitve/Passive push-pull) - Blend - Treble - Bass I found on the http://www.bestbassgear.com/bartolini-preamps-ntbt.htm 4.5 A/P bartolini preamp which matchs with the controls on fortress.. If any of You folks know how does the combination of Bartolini preamp and EMG pups works on Warwick and will I be able to hear major difference of sound ? keep on playin '