BOSS LS-2 Guitar Pedal Power Supply/Line Selector Review: The Swiss Army Knife Your Pedalboard Is Missing

I’ve been there—standing on a dark stage, staring down at a chaotic sprawl of pedals, trying to figure out why my “clean” tone sounds like it’s being filtered through a tin can and why I have to dance like a rhythmic gymnast just to switch from a crunchy rhythm to a lead tone with delay. For most of us, the journey starts with one or two pedals, but quickly evolves into a complex web of signal chains. The problem isn’t just the number of effects; it’s the lack of control over how those effects interact. Without a dedicated traffic controller, you suffer from “tone suck,” tap-dancing fatigue, and a rigid signal path that stifles creativity. Solving this isn’t just about tidying up; it’s about reclaiming the professional-grade fidelity your amplifiers and guitars were designed to deliver. If you don’t address your routing, even the most expensive boutique drive pedal will sound mediocre in a crowded, unmanaged chain.

What to Consider Before Investing in Guitar Signal Path & Pedal Tuners

A Guitar Signal Path & Pedal Tuners is more than just an item; it’s a key solution for any musician who has moved beyond a single “plug-and-play” setup. Think of these tools as the nervous system of your rig. While your pedals provide the “flavor,” the signal path components ensure that the electrical impulses reach their destination without degradation. This category of gear solves the issues of impedance mismatch, signal loss over long cable runs, and the logistical nightmare of switching multiple devices simultaneously. By managing your signal path, you’re essentially future-proofing your tone, allowing for complex parallel processing and ensuring that your tuner—the most critical tool on your board—is always accessible without ruining your signal flow.

The ideal customer for this type of product is the “expanding enthusiast” or the “gigging professional” who needs reliability and versatility. If you find yourself using more than four pedals, or if you switch between two different amplifiers, this is a non-negotiable addition to your gear. However, it might not be suitable for the absolute minimalist who uses a single multi-effects unit or the bedroom player who never unplugs their one favorite overdrive. For those users, a simple high-quality cable might suffice. But for everyone else, choosing a utility pedal is about balance: you need something that adds functionality without adding its own unwanted noise to the circuit.

Before investing, consider these crucial points in detail:

• Dimensions & Space: Pedalboard real estate is the most expensive “property” a guitarist owns. You need a device that provides maximum utility in a compact footprint. Look for a standard “compact” size that fits into traditional rows without requiring custom patch cables or awkward positioning.
• Capacity & Performance: Consider how many loops or paths you actually need to manage. A good selector should handle at least two independent lines (A and B) and offer a “mix” or “blend” function. Performance is measured by the transparency of the buffer—you want your signal to stay strong without the pedal “coloring” the sound.
• Materials & Durability: Since this is a utility pedal you will likely step on more than any other, the housing must be industrial-grade. Metal chassis and heavy-duty footswitches are a must, as plastic components will inevitably fail under the pressure of live performance and frequent transport.
• Ease of Use & Maintenance: The interface should be intuitive enough to adjust mid-gig under low light. Look for clear labeling and knobs that have enough resistance to stay in place if accidentally bumped. Maintenance should be minimal, usually just ensuring the 1/4-inch jacks remain tight and clean.

Once you understand these foundational needs, it becomes clear why certain legendary pieces of gear have remained industry standards for decades. While the BOSS LS-2 Guitar Pedal Power Supply/Line Selector is an excellent choice, it’s always wise to see how it stacks up against the competition. For a broader look at all the top models, we highly recommend checking out our complete, in-depth guide:

First Impressions: Unboxing the “Swiss Army Knife” of Pedals

When I first pulled the BOSS LS-2 Guitar Pedal Power Supply/Line Selector out of its iconic box, the first word that came to mind was “utilitarian.” It doesn’t have the flashy graphics of a boutique fuzz or the glowing screens of a modern digital delay. Instead, it has that classic, tank-like BOSS build quality in a professional silver finish. Holding it, the weight (500 grams) immediately tells you it’s not a toy; this is a piece of industrial equipment designed for the road. Setting it up was a breeze—the jacks are clearly labeled (Input, Output, Send A/Return A, Send B/Return B), making the initial routing logic very easy to follow.

Before you even plug it in, you can see its full feature set and user reviews to understand just how many roles this single box can fill. Compared to older line selectors or simple ABY boxes I’ve used in the past, the LS-2 feels significantly more robust. The mode selector knob has a satisfying “click” to it, and the dual volume pots for Line A and Line B move with a smooth, damped resistance. It doesn’t just look like a tool; it looks like the solution to a dozen different problems I’ve had with my rig over the years.

Deep Dive: Putting the BOSS LS-2 Guitar Pedal Power Supply/Line Selector Through Its Paces

The Six Modes of Tactical Mastery

The heart of the BOSS LS-2 Guitar Pedal Power Supply/Line Selector lies in its six-position mode selector knob. When I first tested this, I was amazed at how it could fundamentally change the architecture of my pedalboard with a single click. You have standard A <-> B switching, which is perfect for toggling between two different amplifiers or two distinct pedal chains. Then there’s the A <-> Bypass and B <-> Bypass modes, which are essential if you want to kick in a whole group of effects (like a “lead” loop with drive, EQ, and delay) and then return to your dry guitar signal with one stomp.

But the real magic for me was the “A + B Mix <-> Bypass” mode. This allows you to run two parallel chains and mix them together. We found this to be a game-changer for maintaining the “core” of our tone. For instance, you can have a heavy distortion in Loop A and a totally clean signal in Loop B. By blending them, you get the grit of the distortion without losing the note definition and “thump” of the clean signal. This is a feature that really sets it apart from basic ABY boxes. You should check the latest price and availability to see why this level of control is considered a steal at its price point. During our testing, the switching was instantaneous and silent, with no audible “pop” that often plagues cheaper selectors.

Level Control: The Secret Weapon for Tone Consistency

One of the biggest headaches in guitar performance is volume inconsistency. You switch from a clean sound to a fuzz, and suddenly the volume drops or spikes so hard the sound engineer glares at you. The BOSS LS-2 Guitar Pedal Power Supply/Line Selector solves this elegantly with two independent level knobs for Line A and Line B. Each knob provides a significant amount of gain—up to +20dB. This means you can use the LS-2 not just as a selector, but as a dual clean boost.

In our evaluation, we used Loop A for a vintage-style overdrive that historically had a volume drop. By bumping the Level A knob on the LS-2, we were able to perfectly match its output to the bypassed signal. Even better, you can use the LS-2 as a “solo booster” by setting one loop to be empty and cranking the volume. When you stomp the pedal, you get a pure, uncolored volume jump that pushes your tube amp into beautiful saturation. This level of granular control over your gain stages is something every professional rig needs, and the LS-2 delivers it with zero added noise. If you’ve ever struggled with “level-matching” your favorite vintage gear, this utility is a feature that really sets it apart.

The Power Supply Capability: Streamlining Your Board

Beyond signal routing, the BOSS LS-2 Guitar Pedal Power Supply/Line Selector doubles as a power hub. It features a DC Out jack that can distribute power to several other BOSS compact pedals when used with a standard AC adaptor (like the PSA series). We found this to be an incredibly underrated feature for players with smaller to mid-sized boards. Instead of needing a massive, expensive isolated power brick for every single pedal, you can use the LS-2 as the “anchor” for your power needs.

When we rigged up a chain of five BOSS pedals, using the LS-2 to daisy-chain the power significantly reduced the “cable spaghetti” under our feet. Because the LS-2 is a buffered pedal, it also helps maintain signal integrity over the power line. While it won’t replace a specialized isolated supply for high-current digital pedals, for a standard array of analog drives, modulations, and tuners, it’s a brilliant way to save space and money. To get the most out of your setup, you can read more about its technical specifications to see if it matches your current power requirements. It essentially turns your signal manager into a power manager, making it the most hardworking pedal on the board.

Durability and the “Forever” Pedals Philosophy

We need to talk about the physical longevity of this unit. The BOSS LS-2 Guitar Pedal Power Supply/Line Selector is built into the same legendary compact enclosure that BOSS has used since the late 70s. During our testing, we didn’t just step on it; we put it through the rigors of a simulated tour. The knobs are recessed enough that they won’t get sheared off by a stray boot, and the rubberized base ensures it stays put on both hardwood stages and carpeted rehearsal rooms.

The battery compartment is accessible via the thumb-screw at the front—a classic design that remains one of the most user-friendly in the industry. But more importantly, the internal circuitry is designed for reliability. In an era where “disposable” plastic pedals are common, the LS-2 stands out as a “forever” pedal. It’s the kind of gear you buy once and still have on your board 15 years later. Given that it comes with a five-year warranty, the manufacturer clearly stands by its “tank-tough” reputation. If you are tired of gear that breaks after six months of gigging, ordering the unit today is a wise investment in your musical infrastructure.

What Other Users Are Saying

The general sentiment among the guitar and bass community regarding the BOSS LS-2 Guitar Pedal Power Supply/Line Selector is one of high praise, often bordering on reverence for its versatility. One user eloquently described it as the “Swiss Army knife of stompboxes,” noting that it transformed their modest pedalboard into a “command center” capable of bending signals to their will. This aligns perfectly with our finding that the pedal’s utility far outweighs its humble appearance.

Bass players, in particular, are vocal about its benefits. One bassist mentioned using the LS-2 to blend a dry bass signal with various fuzz pedals, solving the age-old problem of losing low-end punch when using guitar-centric distortion. Another user highlighted its role as a “hidden hero” for managing pedals that lack a dry/wet blend knob, such as the Boss BF-3 Flanger. While a few users noted that the sheer number of routing possibilities can be “daunting” at first, the consensus is that once you grasp the logic, it becomes indispensable. Based on this real-world performance data, it’s clear why this pedal remains a staple on professional boards worldwide—you can find more real-world performance data here to see how it might fit your specific genre.

Comparing the BOSS LS-2 to Top Alternatives

1. Truetone 1 SPOT Pro CS7 Isolated Pedal Power Supply

The Truetone 1 SPOT Pro CS7 is a powerhouse, but it approaches the “utility” problem from a different angle than our main product. While the LS-2 focuses primarily on signal routing with a secondary focus on power, the CS7 is a dedicated, isolated power supply first and foremost. It offers seven isolated outputs with various voltages (9V, 12V, 18V), making it the superior choice if your main problem is “dirty” power or high-draw digital pedals. However, the CS7 offers zero signal routing capabilities. It won’t help you blend loops or switch amplifiers. If your signal chain is already perfect but your pedals are noisy, the Truetone is the way to go; but if you need to manage how your effects interact, the LS-2 remains the champion.

2. BOSS GE-7 7-Band Guitar Equalizer Pedal

The BOSS GE-7 is another utility legend, often found alongside the LS-2. The GE-7 focuses on frequency sculpting, allowing you to boost or cut seven different bands to “correct” your tone or create a solo boost. While it shares the “tank-like” build and the level-adjustment capabilities of the LS-2, it lacks the line selection and looping features. We recommend the GE-7 for players who need to fix a “honky” midrange or add sparkle to a dark amp. But for those who need to manage two different signal paths or blend effects, the LS-2 is the correct tool. In an ideal world, many pros actually use both: the LS-2 to route the signal and the GE-7 within one of those loops to shape the specific tone of that path.

3. BOSS TU-3 Chromatic Guitar & Bass Tuner

The BOSS TU-3 is the industry-standard tuner, and like the LS-2, it also offers a power supply output to daisy-chain other pedals. In many ways, the TU-3 is the perfect companion to the LS-2. The TU-3 handles your pitch and basic power distribution, while the LS-2 handles your complex signal routing. If you only have enough money for one utility pedal and your guitar is out of tune, buy the TU-3 first. However, once your tuning is stable, the LS-2 is the next logical step to give you professional control over your effects loops. Many players find that the LS-2 and TU-3 together form the “utility foundation” of a world-class pedalboard.

Final Verdict: Is the BOSS LS-2 the Right Choice for Your Rig?

After extensive testing and comparison, it’s clear that the BOSS LS-2 Guitar Pedal Power Supply/Line Selector is much more than just a utility box; it is the “brain” that many pedalboards are missing. Its ability to act as an A/B switcher, a parallel loop mixer, a clean boost, and a power distributor all in one compact, indestructible housing makes it an incredible value. While “fun” pedals like delays and overdrives get all the glory, the LS-2 is the piece of gear that makes those pedals sound and perform at their absolute best. Whether you are a bassist looking to preserve your low end or a guitarist needing to manage complex gain stages, this pedal is a total game-changer.

In summary, if you are tired of tone loss, messy power setups, and limited switching options, there is no better solution on the market. It is reliable, transparent, and incredibly versatile. Stop struggling with a rigid signal path and start exploring the creative possibilities of parallel processing. We highly recommend this as a foundational piece for any serious musician’s setup. Don’t let your tone suffer another day—check the latest price and secure your BOSS LS-2 today to finally take full control of your sound.