Bartolini NTCT 3 Band Tone Control On Board Preamp w/ 400 Hz Mid-Cut 9-VoltThe NTCT is a tone control module designed for electric guitars, basses and other electric musical instruments. It yields a very wide range of boost or attenuation of the Bass, Midrange and Treble regions of the musical instrument spectrum. Its tonal range is at least equal to that of the order Fender amplifiers with Bass, Treble and Presence (low midrange) controls.The NTCT is designed for the input levels expectable from medium output passive magnetic pickups. Higher output level pickups such as active pickups or some of our 4 string bass humbuckers may cause distortion of the input and/or output stages of the NTCT. Active pickups can be attenuated easily without changing their tone quality. The NTCT-B (lower gain version of the NTCT) should be used for high output passive pickups. For pickups with low output levels (less than 30 mV) the NTCT-H should be used.Wiring diagram 4 shows how to increase the overall gain of the NTCT to compensate for low output pickups. But using the NTCT-H will yield higher built -in gain at lower noise level.