Brands Guides About
Boss PSA120S Power Adapter for Guitar Pedals — main product image
Boss

Boss PSA120S Power Adapter for Guitar Pedals

★★★★★4.7 (1652 reviews)

The industry-standard Boss power adapter keeps your pedalboard running clean with a long 10-foot cable.

$38.00*$39.89Save 4%
✓ In Stock on Amazon.com
View on Amazon

*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

The Boss PSA-120S is the manufacturer-recommended power adapter for Boss compact pedals, Twin pedals, and multi-effects processors. Delivering 500 mA of clean, regulated current, it provides stable power that helps prevent the noise and signal degradation that can come from lower-quality third-party adapters. The nearly 10-foot cable length is a practical upgrade that gives musicians flexibility in positioning their pedalboard relative to the nearest power outlet, whether on stage or in a studio setting.

A thoughtful redesign ensures the adapter's plug does not block adjacent outlets on power strips or wall sockets, a common frustration with bulkier adapters. A built-in LED indicator offers quick confirmation that the unit is receiving power, eliminating guesswork during setup. As an industry-standard power supply from Boss, the PSA-120S is a straightforward and reliable choice for anyone looking to power their Boss pedals with confidence.

Key Features

Works with most BOSS pedals

Industry Standard BOSS power supply

LED indicator for quick visual verification of on/off status, Power cable length is increased to almost 10 feet, New design which does not cover adjacent power outlets

Specifications

Brand
Boss
Model
PSA-120S
Output Current
500 mA
Cable Length
Approximately 10 feet
LED Indicator
Yes
Plug Design
Does not cover adjacent outlets
Compatibility
Boss compact pedals, Twin pedals, multi-effects

Pros & Cons

👍 Pros

  • Industry-standard Boss power supply ensures broad compatibility across Boss pedal lines
  • Nearly 10-foot cable length provides generous reach from outlet to pedalboard
  • Slim design avoids blocking adjacent power outlets on strips and wall plates
  • LED indicator makes it easy to confirm power status at a glance

👎 Cons

  • 500 mA output may not be enough to power multiple pedals through a daisy chain simultaneously
  • Only compatible with Boss and select pedals that use the same polarity and voltage — not a universal supply
  • Does not include any daisy-chain cable for powering multiple pedals from one adapter

Frequently Asked Questions

It works with most Boss compact pedals, Twin pedals, and multi-effects units. It is the recommended power supply from Boss for these products.
The cable length is approximately 10 feet, giving you plenty of reach from an outlet to your pedalboard.
No, the updated design is specifically shaped to avoid covering neighboring outlets.
The PSA-120S includes a built-in LED indicator that provides quick visual confirmation of its on/off status.
It provides 500 mA of current, which is sufficient for most Boss compact and multi-effects pedals.

Related Products