Power Supplies 6 min read Published 2026-09-01

Pedalboard Underside Power Supply Mounting Guide: Clearances, Brackets & Floor Scraping

Mounting your isolated power supply underneath your pedalboard saves top-deck space. Learn minimum riser heights, bracket types, Dual Lock tricks, and how to prevent floor scraping.

Why Mount Your Power Supply Underneath the Pedalboard?

On any pedalboard, top deck real estate is precious. A full-sized isolated power supply like a Voodoo Lab Pedal Power 3 Plus, Strymon Zuma, or Fender Engine Room LVL12 occupies roughly the same surface area as two standard Boss pedals or three mini pedals.

By mounting your power supply underneath the deck slats:

  • You Gain 2 to 3 Extra Pedal Slots: Room for that extra boost, tuner, or chorus pedal.
  • You Isolate High-Voltage AC Noise: Keeps 120V/240V mains power and toroidal transformers physically separated from high-gain analog overdrive and vintage fuzz circuits.
  • You Achieve Clean Cable Routing: Low-voltage DC cables travel cleanly up through the slats directly into pedal jacks without crossing audio signal cables.

    • However, underside mounting comes with one major engineering hurdle: Vertical Riser Clearance & Ground Collision.

    Power Supply Thickness vs. Required Board Clearance

    If your pedalboard's underside clearance is smaller than your power brick's depth, the unit will make contact with the floor, causing your board to teeter, wobble, and scratch hardwood stages.

    Here is a verified clearance reference for the most popular isolated power supplies:

    Power Supply UnitThickness / Depth (mm)Minimum Safe Board ClearanceIdeal Mounting Style
    Cioks DC7 / SOL25.4 mm (1.0")30 mmUltra-slim; fits under low-profile boards (Pedaltrain Metro/Nano) with Cioks GRIP
    Cioks 425.4 mm (1.0")30 mmUltra-slim expander or standalone fly-rig PSU
    Strymon Ojai33.0 mm (1.3")38 mmCompact lightweight bracket or Dual Lock
    Caline CP-05 / CP-20634.0 mm (1.35")40 mmBudget brick; fits under standard slanted boards
    Strymon Zuma46.0 mm (1.8")52 mmZuma mounting brackets under Pedaltrain Classic/Novo
    Voodoo Lab Pedal Power 2+ / 345.0 mm (1.77")50 mmIndustry standard; requires angled rails or bracket kit
    Truetone 1 SPOT Pro CS1250.0 mm (2.0")56 mmDeep chassis; requires high-clearance boards (≥55mm riser)
    Fender Engine Room LVL1242.0 mm (1.65")48 mm4-screw chassis bracket mount
    📐 Minimum Safe Clearance Formula:
    Minimum Safe Clearance = PSU Depth + 5mm (Safety Bumper & Dual-Lock Buffer)

    4 Ways to Mount a PSU Underneath Your Board

    1. Dedicated Manufacturer Brackets (Most Secure)

    Brands like Pedaltrain (PT-VDL-MK, PT-BRKT), RockBoard (The Tray), and Temple Audio (MOD-PSU) produce laser-cut steel brackets designed specifically for their frame rails.

  • Pros: Ultra-rigid, tour-grade reliability, never sags in extreme summer heat.
  • Cons: Requires drilling pilot holes into aluminum tube frames.

    • 2. Cioks GRIP Bracket (Zero Drilling)

    The Cioks GRIP is an engineering marvel that clamps mechanically onto the underside rails of Pedaltrain boards using set screws.

  • Pros: 100% drill-free, installs in 60 seconds with an Allen wrench.
  • Cons: Works exclusively with Cioks DC7, 4, and 8 power units.

    • 3. 3M Dual Lock SJ3550 (Best Tool-Free Solution)

    Unlike standard hook-and-loop Velcro, 3M Dual Lock features interlocking mushroom-shaped plastic stems with heavy-duty VHB acrylic adhesive.

  • How to Use: Clean the aluminum rails with 90% Isopropyl alcohol. Apply two strips of Type 250 or Type 400 Dual Lock to the PSU and frame. Press firmly until you hear the audible "snap".
  • Pros: No tools required, absorbs road vibrations, easily transferred between boards.
  • Holding Strength: Holds up to 1 kg (2.2 lbs) of inverted weight without shifting.

    • 4. Heavy-Duty UV-Resistant Zip Ties (The Emergency Gig Fix)

    If you're at a venue and need to secure a backup power supply quickly, crisscrossing two 50-lb rated UV-resistant black nylon cable ties around the frame rails provides solid temporary mounting.

    Common Underside Clearance Mistakes to Avoid

    1. Setting Clearance to 0mm on Slatted Boards with PSUs: If you configure a custom flat board with 0mm standoff legs, any underside power unit will lift the board off the ground.

    2. Blocking the IEC Power Cord Inlet: Ensure the 120V/240V AC power socket faces outward toward the rear rail cutout so you can plug in the main power cable without obstruction.

    3. Placing Analog Wah/Fuzz Pedals Directly Above the PSU: Toroidal transformers inside older power supplies emit an electromagnetic field (EMF). Place sensitive germanium fuzz pedals and high-impedance wah circuits on the opposite side of the board to prevent 60Hz hum induction.

    Test Your Underside Clearance in 3D on BoardPlannerHub

    Before you drill mounting holes or buy brackets, test your exact setup online!

    The BoardPlannerHub Pedalboard Planner includes:

  • Automated Underside Collision Detection: Warns you instantly if your power supply depth exceeds the board's riser clearance.
  • 1-Click Auto-Fit: Automatically adjusts your board's clearance to the ideal safe height.
  • 3D Underside Stage Inspector: Flip your rig upside down in 360° WebGL 3D to inspect power supply brackets, clearance gaps, and under-deck cable paths!

    • Ready to Plan Your Guitar Rig?

    Use BoardPlannerHub's free interactive 1:1 scale pedalboard planner to test pedal layouts, calculate mA current draw, and auto-wire patch cables.

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