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NOLL TCM 3P 2-Pickup 4-Knob 3-Band Vol/Bl P/P A/P Stack - Treb/Treb Stack - Bass/Bass Stack - Mid/Mid Stack
DescriptionControl Configuration 2-Pickup 3-Band System Volume Push-Pull(Push-Pull Active/Passive)/Blend Stack Treble(Boost/Cut)/Treble(Frequency) Bass(Boost/Cut)/Bass(Frequency) Midrange(Boost/Cut)/Midrange(Frequency) Onboard Preamp TCM 3 P The NOLL TCM 3 P is a compact equalizer that provides easy and space-saving installation. The secure insulation of the sealed equalizer perfectly protects other electrical components. Bass, midrange and treble controls are center-detented and allow 15dB of boos
Comments from forums and Reddit
Discussed in Wal and other filter-based preamps in the TalkBass community
There is also this one from Noll: NOLL TCM 3P Vpp/Bl - T/T - B/B - M/M - Best Bass Gear ... more
That's pretty nice looking. But it's not a filter preamp. It's a three-band preamp with adjustable centers for all three bands. No HPF/LPF happening here. ... more
I don't think this qualifies as on topic, but, it does look good. ... more