N-audio Electronics
Handcrafted Boutique Guitar Effects

Powerbox PRO - stompbox supply

Powerbox PRO guitar effects power supply

    Do you have too many effect pedals? And too many supply adapters for your guitar or bass effects, which take up too much space and are nothing but trouble with currents and make a lot of noise? Are you looking for a convenient solution? You want your flexible guitar effects power supply to be quiet, stable, isolated and filtered, with individually separated power outputs, different output voltage options and with no ground-loop issues! You want to power your whole pedalboard with just one cable plugged directly into the socket, and to be able to power on all of your effect pedals quickly? Then the new Swiss army knife guitar effects power supply Powerbox PRO is what you need!

   N-audio Powerbox PRO is a power supply for effect pedals. It is based on our bestseller Powerbox Mk2, but the PRO version has two more isolated high current switchable AC/DC output groups. Unlike most of the cheap adapters, this power supply unit is based on high-quality transformers with a reduced flux density to reduce noise and gives you 7 independent galvanically isolated output groups. Each group can supply two effects pedals (14 pedals in total). The output voltage of most output groups can be changed via DIP switches at the top of the unit. All DC outputs are short circuit protected.  Due to the galvanically isolated groups, Powerbox PRO power supply for effect pedals guarantees a significant decrease of noise and ground loop problems. Additionally, thanks to the galvanic isolation, you can use it for supplying pedals that require AC effects, 18 or 24 VDC guitar effects or effects with centre positive supply, for instance, fuzz faces, germanium boosters, tycobrahe octavia style octavers and others.

Powerbox PRO pedalboard power supply for effect features:
9 VAC, 9/12 VDC
Outputs 1-4
Four high current AC or DC outputs. Each of these output groups can deliver maximum 1500mA for 9VAC effects like a Digitech Whammy, JamMan, Line6 pedals, ISP Theta and many more. Can be used also as a high current DC supply for your Strymon, Eventyde, TC electronics, Line6 etc, multi-effect processors or loopers. Works great with any low power effects too.

9/12 VDC Outputs 5-8
These outputs can deliver up to 520mA current per group. They are ideally high current DC effects like Strymon, Eventyde, TC electronics, Line6 etc, multi-effect processors or loopers. Works great with any low power effects too.

9/15/18/24 VDC Outputs 9-10
These outputs are ideally for some 24 volt Electro-Harmonics effects, 18 volt boosters/overdrive pedals like Cmat mods Browne. Can power 15 volt Radial Tonebone effects and also high current 9 VDC effects. Works great with any low power effects too.

Ultra low noise 9.5 VDC  Outputs 11-14
These ultra low noise outputs simulate 9 volt alkaline battery and can deliver up to 100mA per group. They have less than 130dB noise at 5mA current consumption. They are ideal for any sensitive low power analogue pedal like a wah pedal, overdrive pedal, booster, distortion, compressor etc.


What's in the box:

Powerbox PRO is available in a kit of all necessary cables for powering effects, which content:

  • Standard IEC power cord with EU, UK or US plug (Australian plug not available)
  • Eight standard black cables with a diameter of ø5.5/ø2.1mm and  length of 50cm
  • Two (red and blue) cables with a diameter of ø5.5/ø2.5mm and length of 35cm
  • One black cable with 3.5mm mono jack output and length of 35cm
  • Three reverse polarity cables with a length of 15cm
  • One current doubler Y parallel cable



  • Dimensions: 19х5х9cm
  • Weight: 1.8Kg
  • DC output voltage: 9, 12, 15, 18, 24 VDC
  • AC output voltage: 9 VAC (12 VAC on request)
  • Seven galvanically isolated groups
  • Outputs: 14 outputs ø5.5/ø2.1mm centre negative
  • Operation indications: 7 control LEDs
  • Mains supply: 230/240 VAC or 100/110 VAC
  • Mains transformers: 50/60 Hz transformers with reduced flux density
  • Protections: mains fuse, short circuit protected outputs
  • Built to last a lifetime
  • Designed and handcrafted in Europe
  • Warranty: 5 years

Outputs voltage and maximum current consumption:

Isolated output groups

Outputs voltage

Maximum current per group

Outputs 1 and 2 9VAC 1500mA
9VDC 650mA
12VDC 210mA
Outputs 3 and 4 9VAC 1500mA
9VDC 650mA
12VDC 210mA
Outputs 5 and 6 9VDC 520mA
12VDC 240mA
Outputs 7 and 8 9VDC 520mA
12VDC 240mA
Outputs 9 and 10 9VDC 600mA
15VDC 400mA
18VDC 300mA
24VDC 100mA
Outputs 11 and 12 9.5VDC Ultra low noise 100mA
Outputs 13 and 14 9.5VDC Ultra low noise 100mA


The AC output voltage of Powerbox PRO is fixed to 9VAC. There are some guitar effects like Mesa boogie V-twin, Hughs & Kettner Tubeman, Electro-Harmonics Tube Zipper, English Muff'n and Wiggler, Neo Instruments Ventilator and other wich requires 12VAC. Also, there are some 16VAC effects like Blackstar HT tube effects. For these or other effects we offer customisation with your requirements.

Powerbox PRO mains switch
Powerbox comes with fixed mains supply 115 or 230VAC, but we can add a voltage selector: 115-230VAC, placed on the bottom of the supply on request.
For these or any other specific requirements, please contact us.


Usually, we ship our Powerbox PRO within 1-2 days. For a custom option, the producing time is about 2 weeks. The time for delivery to Europe is 4-10 days, 2-4 weeks for worldwide delivery via registered priority mail.

We accept almost any type of payment: Bank transfer, MoneyGram, Western Union etc. Also, you can buy directly from our site via PayPal, but if you like to choose your preferred payment method, please contact us.  We will try to comply with your request.

English Muff’n

(incl. shipping to)