These are very popular budget SDCs, so from this point of view perfect modding candidates. Actually, the B-5 was even the first microphone I modded. But after comparing it with the SC140, I lost interest in further developing electronics for the B-5. The frequency response was not as flat as the SC140, the smaller PCB limited design freedom and the combined pad/high-pass filter switch is less versatile than the separate switches of the SC140. The C-2 is very difficult to take apart, so this one fell off too.