I don't know if anyone has published about this before but this unit seems really well designed.
Fully analogue Bass Preamp based on the Ampeg SVT with Gain, Level, and a 3-Band EQ with Semi-Parametric Mid control, Parallel Signal Routing with a selectable LPF, Dual FX Loop (for Preamp and Parallel Signal), and an Analog Cabinet Simulation with 3 voicings: 8 x 10", 1 x 15" & 4 x 10" with Microphone Position- and Resonance-Controls; Controls: Gain, Volume, Preamp Blend, Bass, Mid, High, Mic Position, Resonance, Cabsim Blend, Phones Level; Push Buttons: ; Switches: Mid Freq: 900/400/1500 Hz, Parallel LPF: 100/Off/500 Hz, Cab Size: 4 x 10"/8 x 10"/1 x 15", Speaker Color: Bright/Modern/Warm, Parallel Phase, Ground Lift; LED: On; Display: ; Connections: Input (1/4" Jack),Thru/Out (1/4" Jack), DI Parallel (XLR), DI Out (XLR), Preamp FX Send & Return (2 x 1/4" Jack), Parallel FX Send & Return (2 x 1/4" Jack), Aux in (1/8" TRS-Jack), Phones (1/8" TRS-Jack); Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; Current Draw: 80 mA; powered by a 9 V DC Power Supply (not included).
Fully analogue Bass Preamp based on the Ampeg SVT with Gain, Level, and a 3-Band EQ with Semi-Parametric Mid control, Parallel Signal Routing with a selectable LPF, Dual FX Loop (for Preamp and Parallel Signal), and an Analog Cabinet Simulation with 3 voicings: 8 x 10", 1 x 15" & 4 x 10" with Microphone Position- and Resonance-Controls; Controls: Gain, Volume, Preamp Blend, Bass, Mid, High, Mic Position, Resonance, Cabsim Blend, Phones Level; Push Buttons: ; Switches: Mid Freq: 900/400/1500 Hz, Parallel LPF: 100/Off/500 Hz, Cab Size: 4 x 10"/8 x 10"/1 x 15", Speaker Color: Bright/Modern/Warm, Parallel Phase, Ground Lift; LED: On; Display: ; Connections: Input (1/4" Jack),Thru/Out (1/4" Jack), DI Parallel (XLR), DI Out (XLR), Preamp FX Send & Return (2 x 1/4" Jack), Parallel FX Send & Return (2 x 1/4" Jack), Aux in (1/8" TRS-Jack), Phones (1/8" TRS-Jack); Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; Current Draw: 80 mA; powered by a 9 V DC Power Supply (not included).