Boss LS-2 Line Selector AC Adaptor User Manual

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Boss LS-2 Line Selector AC Adaptor Manual

The boss LS-2 Line Selector AC Adaptor setup gives musicians a dependable way to power and control multiple signal paths with the BOSS LS-2 Line Selector. Designed for guitarists, bassists, keyboard players, and pedalboard users, the LS-2 can switch between effect loops, blend external effects, or route a clean signal around selected pedals.

The LS-2 uses a compatible 9-volt BOSS PSA-series AC adaptor, sold separately. Using the correct adaptor provides consistent power during rehearsals, recording sessions, and live performances without relying on a replaceable battery. The pedal also includes a DC output that can distribute power to compatible BOSS compact pedals when used with the appropriate parallel DC cable.

Six operating modes support practical configurations such as selecting between two effects chains, mixing two loops, or using the pedal as a signal router. Buffered bypass helps preserve signal integrity across longer pedalboard cable runs. The LS-2 is especially useful when one instrument needs access to separate clean, distorted, ambient, or specialty effect paths.

This guide explains how to select a suitable AC adaptor, connect the LS-2 safely, configure its loops, and resolve common power or signal problems. It is intended for users searching for a BOSS LS-2 power supply guide, LS-2 Line Selector setup instructions, or reliable pedalboard power advice.

Boss LS-2 Line Selector AC Adaptor Specifications

Compatible adaptor: BOSS PSA-series AC adaptor, purchased separately.
Required pedal power: 9 V DC operation.
Current draw: Approximately 30 mA according to current BOSS product specifications.
Alternative power: One 9 V carbon-zinc or alkaline battery.
Input level: Nominal -20 dBu.
Input impedance: 1 MΩ.
Output level: Nominal -20 dBu.
Output impedance: 1 kΩ.
Recommended load: 10 kΩ or greater.
Bypass type: Buffered bypass.
Connections: 1/4-inch input, send A and B, return A and B, output, and DC power connections.
Power distribution: The DC output can supply compatible BOSS compact pedals when used with a PCS-20A parallel DC cord and a suitable PSA-series adaptor.
Operating modes: Six selectable modes for loop selection, signal mixing, and routing applications.

Adaptor specifications can vary by regional model, so confirm that the label and connector match the pedal before use. Do not substitute an adaptor with an unknown voltage, polarity, or connector size.

How to Set Up the Boss LS-2 Line Selector AC Adaptor

Step-by-step connection guide

Turn the amplifier and all connected equipment off.
Place the LS-2 on a stable pedalboard surface with adequate ventilation.
Connect the output of the instrument or preceding pedal to the LS-2 INPUT jack.
Connect SEND A and RETURN A to the first effects loop. Use SEND B and RETURN B for a second loop.
Connect the LS-2 OUTPUT to the amplifier, mixer, audio interface, or following pedal.
Insert the plug from the compatible BOSS PSA-series adaptor into the LS-2 DC IN jack.
Connect the adaptor to a properly rated mains outlet, then power on the amplifier.
Choose the required mode and adjust the LEVEL A and LEVEL B controls to balance the two paths.

For power distribution, connect a PCS-20A parallel DC cord only to compatible BOSS pedals. Never force a connector or connect equipment that requires a different voltage or polarity.

If the indicator does not illuminate, verify the adaptor connection, outlet, cable condition, and pedal polarity. Always disconnect power before changing complex wiring. Keep the adaptor dry, avoid damaged cables, and use surge protection where appropriate.

Boss LS-2 Power and Signal Troubleshooting

No power: Confirm that the adaptor is a BOSS PSA-series model with the correct 9 V DC output. Test another known-good outlet and inspect the DC plug for damage.
Intermittent operation: Reseat the adaptor plug and check for loose pedalboard power connections. Replace damaged cables rather than taping exposed conductors.
No instrument signal: Check the INPUT, OUTPUT, SEND, and RETURN connections. A loop with an incorrectly connected return cable can interrupt the signal path.
One loop is silent: Confirm the selected operating mode, verify both loop cables, and check that the connected effect is powered and bypassed correctly.
Unexpected volume change: Adjust LEVEL A and LEVEL B separately and check whether a connected effect has its own output-level control.
Hum or noise: Remove unnecessary patch cables, test each pedal individually, and avoid sharing power with equipment that introduces ground noise.
Power-sharing failure: Use only a compatible parallel DC cable and compatible BOSS pedals. Excessive current demand may cause unstable operation.

The LS-2 does not generally use user-facing error codes. If the pedal remains faulty after cable, adaptor, and loop checks, stop using it and contact BOSS or an authorized Roland/BOSS service center. Keep proof of purchase and note the pedal’s symptoms, adaptor model, and connected equipment when requesting assistance. Warranty coverage and service procedures vary by country and product category.

Boss LS-2 Line Selector AC Adaptor Pros and Cons

Advantages

Reliable pedalboard power: A compatible PSA-series adaptor avoids frequent battery replacement during long rehearsals or performances.
Flexible routing: Two external loops support separate effect chains, A/B selection, or blended processing.
Efficient expansion: The DC output can power compatible BOSS pedals with the correct parallel cable and adaptor.
Signal preservation: Buffered bypass is useful for maintaining a consistent signal through longer cable runs.
Broad use cases: The LS-2 suits guitar, bass, keyboard, recording, and live pedalboard applications.

Limitations

Adaptor sold separately: The pedal does not automatically include the PSA-series AC adaptor.
Compatibility matters: Generic or incorrectly rated adaptors may cause noise, malfunction, or damage.
Manual routing required: Users must understand send-and-return signal flow to configure both loops correctly.
Limited power distribution: The DC output is intended for compatible BOSS devices, not unrestricted universal pedal power.
Who should choose it: The LS-2 is best for players needing flexible loop switching or blending. Users who only need basic daisy-chain power may prefer a dedicated isolated pedalboard power supply.

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Faqs

How do I set up the BOSS LS-2 Line Selector AC Adaptor for the first time?

Place the LS-2 on a stable pedalboard and connect a compatible BOSS PSA-series adaptor to the DC IN 9V jack. Connect your guitar or other instrument to INPUT, then wire the A and B loop jacks according to the signal path you want to select. Connect OUTPUT to the amplifier or next pedal. Insert the adaptor plug fully, then test each mode at low amplifier volume before making final cable adjustments.

Can I use any 9V power supply with the BOSS LS-2 Line Selector AC Adaptor?

Use the specified BOSS PSA-series AC adaptor rather than choosing a generic 9V supply by voltage alone. The adaptor must have the correct DC output, polarity, plug size, and sufficient current capacity for the LS-2 and any pedals powered from its DC OUT jack. An unsuitable supply can cause noise, unstable operation, or damage. Check the adaptor label and LS-2 documentation before connecting it.

Why is my BOSS LS-2 Line Selector not turning on with the AC adaptor?

First, confirm that the PSA-series adaptor is connected to a working outlet and that its plug is fully inserted into the LS-2 DC IN 9V jack. Disconnect all daisy-chain cables and test the pedal by itself. Inspect the adaptor cable and pedal jack for damage, then try a known-good compatible adaptor. If the indicator still does not light, remove the adaptor and have the pedal inspected rather than repeatedly applying power.

How can I power other pedals from the BOSS LS-2 Line Selector AC Adaptor?

When the LS-2 is powered by a compatible PSA-series adaptor, its DC OUT jack can supply power to other PSA-compatible BOSS compact pedals. Use the optional PCS-20A parallel DC cord and connect only devices with matching power requirements and polarity. Do not assume every pedal is compatible. Add pedals one at a time and listen for hum, voltage-related problems, or reduced reliability if the connected setup exceeds the adaptor's available capacity.

Which LS-2 mode should I use to switch between two effects chains?

Use the LS-2 mode that alternates between loop A and loop B when you want one effects chain active at a time. Connect the first chain to the A SEND and RETURN jacks, and the second to B SEND and RETURN. Use the level controls to balance both paths so switching does not create a sudden volume jump. Confirm each loop independently before comparing the two chains during rehearsal.

What should I do if the LS-2 produces hum, hiss, or a weak signal?

Check every instrument and patch cable by replacing them with known-good cables, then confirm that each pedal in the A and B loops is powered correctly. Keep audio cables away from mains adaptors and transformer bricks, and test the LS-2 outside the pedalboard to isolate grounding or routing problems. Set the loop level controls near unity first, because excessive boosting can increase noise and clipping.

How do I prevent volume changes when switching LS-2 loops?

Set the amplifier and connected pedals to a consistent baseline, then adjust the LS-2 loop level controls while switching between paths. A louder loop can make the quieter path seem dull, while excessive level may overload a following pedal or amplifier input. Compare both loops with the same playing dynamics and verify the result at performance volume. Mark the final knob positions so accidental changes are easy to identify.

How should I maintain and store the BOSS LS-2 Line Selector AC Adaptor setup?

Disconnect the AC adaptor from the outlet when the pedalboard will not be used for an extended period. Avoid sharply bending the adaptor cable, pulling it by the wire, or placing heavy equipment on it. Keep the LS-2 and power connections dry, dust-free, and protected from extreme heat. Periodically inspect plugs, jacks, and daisy-chain cables for looseness or damage, and replace defective accessories before live use.