Zuma R300 Support

Download the user manual, read FAQs or contact us if you need more help.

User Manual

User Manual

Drill Template

Want to mount your Zuma R300 under your pedalboard with the included screws? Download the drill template and installation instructions.



Yes, Zuma R300 provides automatic worldwide power compatibility (100-240V 50/60Hz), and can be used internationally with the appropriate region-specific IEC cable. The IEC cable is the cable that connects from the wall outlet to the back of Zuma.

Zuma R300 ships with the IEC cable for the region in which it is purchased. If you intend to use Zuma R300 internationally, you will need to purchase the appropriate IEC cable for the region that you will be traveling to.

IEC cable US

Zuma R300 provides a total of five – 9V DC center negative outputs, providing 500mA of current each.  One of these is an adjustable output that can be set to 9V (500mA), 12V (375mA), or 18V (250mA).  Pedals can be connected to Zuma R300 with the included 2.1mm x 5.5mm barrel connector cables.  Zuma R300 can power most effects pedals on the market, including all Strymon pedals. However, there are some pedals that have different requirements:

My pedal requires LESS than 500mA of current:

  • It is safe to power your 9V DC pedals that require less than 500mA.  This applies to most effect pedals. Your pedal will only draw the current it needs.

My pedal requires MORE than 500mA of current:

  • You can use a third party CURRENT DOUBLER cable to sum the current of two outputs together to power a single pedal.

My pedal requires 12V DC:

  • You can use Zuma R300’s adjustable output set to 12V.

My pedal requires 18V DC:

  • You can use Zuma R300’s adjustable output set to 18V.

My pedal requires center-positive polarity:

My pedal requires 15V/24V DC:

  • Zuma R300 provides 9V, 12V, or 18V DC outputs.  24V can be achieved by using a third party voltage doubler device plugged into the adjustable output set to 12V, however, Zuma R300 does not have options to provide 15V.

My pedal requires AC power:

  • Zuma R300 only provides DC power, so it cannot be powered.

****Caution: Providing too much or too little voltage to your pedals can provide undesired performance or even damage your pedals. Please make sure to check with each of your pedals’ manufacturer for recommended voltage, polarity, and current to ensure proper operation and prevent damaging your pedals with incorrect power.****

Zuma R300 features built in threaded hardware for easy mounting to the top or bottom of most pedalboards. A drill template and mounting screws are included in the box.

Zuma R300 is low profile, incredibly lightweight, and can also be mounted to the top or bottom of most pedalboards (including Pedaltrain Nano and Metro boards) without modifications using only VELCRO® or Dual Lock™.


With Zuma R300, you can add more power outputs to your power supply by linking Strymon Ojai or Ojai R30 units to Zuma R300’s 24V output allowing your power to grow with your pedalboard.

To connect Ojai units to Zuma R300:

  1. Power your Zuma R300 from the wall outlet with the included IEC power cable.
  2. Connect one end of Ojai’s included EIAJ-05 power adapter cable to the 24V OUT on your Zuma R300.
  3. Connect the other end of the EIAJ-05 power adapter cable to the 24V IN of your Ojai.
  4. Link additional Ojai units by connecting one end of the EIAJ-05 cable to the 24V THRU to the 24V IN on the next Ojai in the chain.

Please read this FAQ for info on how many pedals can be powered when linking Ojai units.

You can link as many as 5 Ojai and/or Ojai R30 units to Zuma R300, powering up to 30 effects pedals.  While it’s unlikely that anyone would go to such extremes, we wanted to ensure Zuma R300 delivers maximum flexibility and expandability.  A much more likely scenario would be to link 1 or 2 Ojai units to Zuma R300, powering a combination of up to 15 high and low current draw pedals.


Ojai and Ojai R30 Expansion Kits consist of an isolated power distributor and all of the necessary connection cables to integrate it with your existing Strymon power supply and power up to five additional effects pedals.  

Expansion Kits require an existing Strymon power product which connects to an AC power outlet, either directly (ZumaZuma R300) or via an external power adapter (Ojai R30Ojai). Simply link an Expansion Kit to your existing Strymon power product via the 24V jack.

Expansion Kits include:

  • 1x Ojai
  • Five (5) 2.1mm x 5.5mm pedal cables  – 18” long, right angle to right angle barrel connectors
  • EIAJ-05 link cable – 18″ long to connect Ojai to PS-124 or Zuma/Zuma R300 power supply

If you are getting noise from your power supply after introducing Zuma to your pedalboard setup which was powered by a different power supply, this typically means that there is likely a grounding problem with the connections in your signal chain.  Some power supplies can hide grounding issues that affect your tone without realizing it.

If, after introducing Zuma to your pedalboard, you are getting noise in your audio signal, we recommend testing the continuity of each of the cables in your signal chain (mainly sleeve-to-sleeve) to determine where they may be a loss of a ground connection in your signal chain that could create this noise.

If you continue to have trouble, please send us an email to [email protected]


Zuma R300:

  • Weight: 0.9 lbs. (400g)
  • Dimensions: 7.25” x 3.5” x 1.18” (184mm x 88mm x 30mm)


  • Five (5) 2.1mm x 5.5mm pedal cable (18” long, straight to right angle connectors)
  • IEC cable (region-specific) – 6 ft.

Strymon Non-Transferrable Limited Warranty



Strymon warranties its products and their varying components to be free from defects in material and workmanship for the following periods of time from the original date of purchase when purchased from an Authorized Strymon Dealer:

  • Effects Pedals
    • 2 Years – Compadre, Iridium, NightSky, Riverside, Sunset, Volante,
    • 1 Year – BigSky, blueSky, Brigadier, Deco, DIG, El Capistan, Flint, Lex, Mobius, OB.1, Ola, Orbit, TimeLine
  • Eurorack Modules
    • 2 Years – AA.1, Magneto
  • Power Supplies
    • 5 Years – Zuma, Zuma R300, Ojai, Ojai R30
    • 1 Year – Factory power supplies for pedals
  • Accessories
    • 1 Year – MiniSwitch, MultiSwitch Plus, original MultiSwitch, MIDI EXP Cables, DC Power Cables, EIAJ-05 Link Cables, 24V Power Adapter for Ojai/Ojai R30, Polarity Reversal Adapters, Voltage Doubler Adapters, Daisy-Chain Power Cables

If the product fails within the warranty period, Strymon will repair or, at our discretion, replace the product at no cost to the original purchaser.



This warranty covers defects in manufacturing discovered while using this product as recommended by Strymon. This warranty does not cover loss or theft, nor does the coverage extend to damage caused by misuse, abuse, unauthorized modification, improper storage, lightning, or natural disasters. Damage caused by any of the above circumstances may result in a non-warranty repair fee.

Products that were purchased from an unauthorized dealer are not covered under warranty.  The warranty is non-transferrable and does not cover used or second-hand products.


Limits of Liability

In the case of malfunction, the purchaser’s sole recourse shall be repair or replacement, as described in the preceding paragraphs. Strymon will not be held liable to any party for damages that result from the failure of this product. Damages excluded include, but are not limited to, the following: lost profits, lost savings, damage to other equipment, and incidental or consequential damages arising from the use, or inability to use this product. In no event will Strymon be liable for more than the amount of the purchase price, not to exceed the current retail price of the product. Strymon disclaims any other warranties, express or implied. By using the product, the user accepts all terms herein.


How to Obtain Service Under this Warranty

For North American customers: Contact Strymon through our website at http://www.strymon.net/support for Return Authorization and information. Proof of original ownership may be required in the form of a purchase receipt.

For International Customers: Contact the Strymon dealer from which the product was purchased from in order to arrange warranty repair service.

To locate your nearest authorized Strymon dealer, please use the following link:

Authorized Strymon Dealers

You can also contact Strymon directly at (805) 468-8788 or (800) 980-8160 for help finding your nearest authorized Strymon dealer.

Strymon products purchased from an authorized dealer are covered by a manufacturer’s warranty.  A purchase receipt from an authorized dealer is required with any request for warranty service.

Please note that any Strymon products that have been purchased from an unauthorized dealer are not eligible for coverage under the manufacturer’s warranty. If you are uncertain, please contact Strymon directly at (805) 468-8788 or (800) 980-8160 before your purchase.

***NOTE: Warranties for Strymon products are non-transferrable.  Second-hand items, including sales from websites such as craigslist, Ebay, and Reverb are not covered by a manufacturer’s warranty.  Furthermore, there are no authorized dealers on Amazon, Ebay, or Reverb selling “NEW” Strymon products in the USA.***


Your warranty is valid in the region of purchase. For example, if you buy your product in Japan, any service-related issues will need to be handled in Japan. Products purchased in the United States can only be repaired in the United States.


General Inquiries [email protected]

Technical Support [email protected]

Questions About Orders [email protected]