BOSS PSA-120S2 9V 500mA AC Power Adapter for Guitar Effects Pedals

BOSS PSA-120S2 9V 500mA AC Power Adapter for Effects Pedals

The BOSS PSA-120S2 AC Power Adapter is a regulated 9V DC power supply designed for compatible BOSS guitar effects pedals, multi-effects processors, and electronic music equipment. Delivering up to 500mA with center-negative polarity, this compact adapter provides dependable external power for individual pedals or compatible multi-pedal configurations.

Designed for guitarists, bassists, and musicians using BOSS effects equipment, the PSA-120S2 provides a convenient alternative to disposable batteries. Its 500mA output supports many analog and digital effects pedals, including devices with higher current requirements than earlier 200mA PSA adapters could accommodate. Musicians can also power multiple compatible pedals using a separately available parallel DC distribution cable, provided their combined current consumption remains within the adapter's rated capacity. A compact wall-plug design helps preserve access to neighboring outlets on crowded power strips and pedalboard power setups.

The PSA-120S2 incorporates a blue LED power indicator and an attached 6.6-foot DC cable for flexible placement during rehearsals, recording sessions, and live performances. Its regulated output supports equipment requiring 9V DC with center-negative polarity. Roland identifies the PSA-S2 as a compatible successor to earlier PSA-S power supplies, with updated cable length and indicator characteristics. Before connecting equipment, confirm its voltage, polarity, connector compatibility, and current requirements.

Key Features

• Regulated 9V DC Output: Supplies consistent external power to compatible BOSS pedals and electronic musical equipment requiring a center-negative 9V DC adapter.
• 500mA Current Capacity: Supports compatible analog and digital effects pedals, including devices with greater power requirements than older 200mA adapters.
• Multi-Pedal Power Capability: Can supply several compatible effects pedals through an appropriate parallel DC cable when their combined current draw does not exceed 500mA.
• Blue LED Power Indicator: Provides a convenient visual indication that the adapter is receiving power.
• 6.6-Foot Attached Cable: Offers flexible positioning between the AC outlet and connected equipment during studio sessions and performances.
• Space-Saving Wall-Plug Design: Reduces interference with neighboring AC outlets on compatible power strips and wall receptacles.
• Broad BOSS Equipment Compatibility: Supports many BOSS Compact and Twin pedals, multi-effects units, tuners, metronomes, and other devices specifying a compatible PSA power supply.
• North American Configuration: Provides a compact AC plug arrangement suitable for compatible North American electrical outlets.

Regulated 9V DC Power for BOSS Effects Pedals

The BOSS PSA-120S2 converts AC wall power into regulated 9V DC for compatible guitar effects pedals and electronic music equipment. Its center-negative output configuration matches the requirements of many BOSS products designed to operate with PSA-series adapters.

External power eliminates the need to replace batteries during normal operation. This is particularly useful for digital delays, modulation pedals, loopers, and other compatible devices used frequently during rehearsals and live performances.

The adapter delivers a maximum output current of 500mA. Connected equipment must use the correct voltage and polarity, and its total current requirements must remain within the adapter's rated capacity.

500mA Output for Analog and Digital Effects

The PSA-120S2 provides 500mA of available current, accommodating compatible effects pedals with different power consumption requirements.

Earlier PSA adapters were available with 200mA output capacities. The PSA-S2 series provides additional current for equipment that requires more than 200mA or for compatible multi-pedal arrangements.

The available current capacity does not mean that the adapter continuously delivers 500mA to every connected device. Compatible equipment draws the current necessary for operation, up to the power supply's maximum rating.

Power Multiple Guitar Pedals with Compatible Distribution Cables

The BOSS PSA-120S2 can power multiple compatible effects pedals when used with an appropriate parallel DC distribution cable.

This configuration is useful for musicians building compact pedalboards or operating several low-current pedals from a single AC outlet.

When powering multiple devices, the combined current draw must not exceed 500mA. Every connected pedal must also support the adapter's regulated 9V DC output and center-negative polarity.

Parallel distribution cables are separate accessories and are not included with the adapter.

Compact Plug Design with Blue LED Indicator

The PSA-120S2 features a compact AC plug housing designed to reduce interference with neighboring outlets.

This configuration is particularly convenient when using crowded power strips, pedalboard power arrangements, or recording workstations with several connected devices.

An integrated blue LED provides a quick visual indication that the power supply is receiving electricity. The indicator helps musicians check the adapter's power status during setup and troubleshooting.

Roland identifies the blue indicator as a distinguishing characteristic of PSA-S2 adapters compared with earlier PSA-S models, which use green indicators.

6.6-Foot Attached Power Cable

The PSA-120S2 includes an attached DC output cable measuring approximately 6.6 feet.

This length allows musicians to position compatible equipment away from the AC outlet without immediately requiring an extension cable.

The permanently attached cable also eliminates the need for a separate DC output lead during normal operation.

The PSA-S2 cable measures approximately 2 meters, distinguishing it from earlier PSA-S adapters that feature longer 3-meter cables.

Compatible BOSS Pedals and Electronic Music Equipment

The PSA series is recommended for many BOSS Compact and Twin effects pedals, selected multi-effects processors, tuners, metronomes, and other electronic music devices.

Examples of equipment families associated with PSA-series compatibility include:

• BOSS Compact Effects Pedals: Compatible distortion, overdrive, delay, modulation, and other effects pedals specifying PSA power.
• BOSS Twin Pedals: Supported dual-pedal effects units requiring compatible 9V DC external power.
• BOSS Multi-Effects Processors: Selected ME-series processors designed for PSA-series adapters.
• BOSS Metronomes: Selected DB-series devices, including compatible DB-66, DB-88, and DB-90 models.
• BOSS Drum Machines: Selected DR-series products specifying compatible PSA adapters.
• BOSS Tuners: Compatible TU-series tuning equipment requiring external 9V DC power.
• Roland Electronic Instruments: Selected instruments and controllers that explicitly specify compatible PSA-series power supplies.

Compatibility must be confirmed using the individual device's power requirements. Not every product within these equipment families uses the same adapter.

PSA-S2 Power Supply Design

The PSA-120S2 belongs to the 500mA PSA-S2 adapter family. It retains the regulated 9V DC output associated with compatible earlier PSA-S power supplies.

Roland identifies two principal differences between the PSA-S and PSA-S2 generations: the newer version uses a shorter cable and a blue rather than green power indicator.

The PSA-120S2 is a practical replacement option for compatible equipment requiring the earlier PSA-S adapter, provided the electrical and connector specifications match.

Technical Specifications

General Specifications

• Manufacturer: BOSS
• Manufacturer Corporation: Roland Corporation
• Model: PSA-120S2
• Product Series: PSA
• Product Type: AC/DC Power Adapter
• Primary Application: Guitar Effects Pedals and Compatible Electronic Music Equipment
• Power Supply Configuration: Wall-Plug Adapter with Attached DC Cable
• Adapter Color: Black

Electrical Specifications

• AC Input Voltage Range: 100-240V AC
• Input Frequency: 50/60 Hz
• Nominal Regional Power Configuration: 120V AC, North America
• DC Output Voltage: 9V DC
• Output Regulation: Regulated
• Maximum Output Current: 500mA
• Maximum Rated DC Output Power: 4.5 W
• DC Output Polarity: Center Negative, Outer Positive
• Power Indicator: LED
• Power Indicator Color: Blue

Cable and Connector Specifications

• DC Output Connection: Attached Cable with DC Power Connector
• DC Cable Length: Approximately 6.6 ft
• DC Connector Polarity: Center Negative
• AC Plug Configuration: North American Wall-Plug Design
• Outlet-Saving Design: Compact Housing

Compatibility Specifications

• Compatible Equipment Type: Devices Requiring Regulated 9V DC Power
• Required Device Polarity: Center Negative
• Maximum Supported Current Draw: 500mA
• Compatible BOSS Product Families: Selected Compact Pedals, Twin Pedals, Multi-Effects, Tuners, and Metronomes
• Multi-Pedal Operation: Supported with Compatible Parallel DC Distribution Cable
• Maximum Combined Pedal Current: 500mA
• PSA-S Replacement Compatibility: Supported for Electrically Compatible Devices

What's in the Box

• 1 x BOSS PSA-120S2 AC Power Adapter with Attached DC Cable