Uderhill preamps are built with input buffer(s) for the type of pickup being used, a mixer (blend) module for two-pickup basses, and then the desired EQ modules. EQ modules are normally chained together after the mixer for a conventional multi band preamp, but they can also be used before the mixer, so you can have a separate "preamp" for each pickup! All EQ modules are semi-parametric. You are not locked into one frequency profile because you can set the frequency of the EQ with the lower stacked knob. Peaking modules (EP series) boost or cut a range of frequencies on either side of the frequency setpoint, while shelving modues (ES series) boost or cut all frequencies above or below the setpoint.

 

Click on a module in the Preamp Modules page for detailed specifications. The current lineup is:

 

• EPB Bass EQ - Peaking bass, used in 3-band setups or as a low bass for filter preamps.

• EPM Mid EQ - Peaking midrange, used in any configuration.

• EPT Treble EQ - Peaking treble, used in 3-band setups.

• EPL Low EQ - Low to low-mid range, for a 2 band setup that covers all frequencies.

• EPH High EQ - High-mid to high, to pair with EPL.

• ESB Bass EQ - Shelving bass, same range as EPB. Gentle first order profile.

• EST Treble EQ - Shelving treble, same range as EPT.  Gentle first order profile.

 

Input buffer modules are available which allow different types of pickups to be mixed and matched:

• BP Buffer - For passive and most active pickups.

• BA Buffer - For high-output active pickups.

• B4 Buffer - For four-string multi-coil pickups.

• B5 Buffer - For five-string multi-coil pickups.

• BZ Buffer - For piezo pickups.