Walrus Audio · Preamp

Mantle Analog Bass Preamp // D.I.

9V · ≥500 mA supply · maker

Walrus Audio Mantle Analog Bass Preamp // D.I. power requirements

9V DC · centre negative · needs a supply of at least 500mA
from the maker
“Only use a 9 Volt DC, Center Negative, 500mA to power the pedal. … Power Requirements: 9VDC, 500mA, Center-Negative, 2.1mm. … Internally boosted to +24V for higher headroom.” source
Checked 2026-10-13

154.78 × 119.35 × 57.98 mm (6.09 × 4.70 × 2.28 in)

Width × depth × height, from the manufacturer.

Each has an output that can power it, checked against its published figure. Plan the whole board to see what runs everything.