MXR M87 Bass Compressor Effects Pedal with True Bypass Review: The Professional Studio Tool for Your Pedalboard
As bass players, we often face a frustrating paradox. We want our low-end to be powerful and foundational, yet we also need the nuance of our playing—the subtle finger pops, the ghost notes, and the aggressive slap textures—to cut through a dense mix without overbearing the rest of the band. I’ve spent countless nights on stage feeling like my sound was either too quiet in the delicate sections or dangerously peaking when I dug in. This inconsistency is more than just a minor annoyance; it’s a barrier to professional-grade performance. Without proper dynamic control, your “sweet spot” is a moving target. That is exactly why I decided to put the MXR M87 Bass Compressor Effects Pedal with True Bypass through its paces. Solving the “volume spike” problem isn’t just about saving your speakers; it’s about giving your tone the polished, finished quality of a studio recording in a live environment. If you don’t address your dynamics, your performance remains raw and unpredictable, which is why a high-caliber tool like this is often the most important pedal on a professional’s board.
- CHT Constant Headroom Technology for clear, clean performance
- 10 gain-reduction status LEDs
Choosing the Right Compression: A Comprehensive Buyer’s Guide for Bassists
An Electric Guitar Compression Effects (or specifically, a bass-centric one) is more than just an item; it’s a key solution for achieving tonal consistency and professional presence. In the world of bass, compression acts like an invisible hand, riding the volume fader of your performance in real-time. It tames the “thump” of a heavy thumb-slap and brings forward the “whisper” of a soft finger-style passage. This ensures that every note you play occupies its intended space in the sonic spectrum. Beyond volume control, a great compressor adds sustain and “glue,” making your bass lines feel more cohesive and professional. When you see its full feature set and user reviews, you begin to understand that this isn’t just an effect—it’s a utility that elevates everything else in your signal chain.
The ideal customer for this type of product is someone facing dynamic inconsistencies or the “disappearing bass” syndrome during complex songs. It is perfect for session players, touring professionals, and serious hobbyists who want a “studio-to-go” sound. However, it might not be suitable for those who prefer an extremely raw, unadulterated vintage sound with zero signal processing, or for beginners who may find a five-knob interface slightly intimidating at first. For those seeking a simpler “plug-and-play” experience with only one or two knobs, a more basic sustainer might be the alternative. But for the tone chaser, the MXR M87 Bass Compressor Effects Pedal with True Bypass offers a level of control that few competitors can match.
Before investing, consider these crucial points in detail:
- Dimensions & Space: In the world of modern pedalboards, real estate is at a premium. You should look for a pedal that offers a compact footprint without sacrificing control. A standard “Phase 90” sized enclosure is usually the gold standard for fitting into tight spaces while remaining easy to stomp.
- Capacity & Performance: For bass, “headroom” is king. Because bass frequencies carry so much energy, a compressor needs to handle high-input signals without distorting. Look for technologies like Constant Headroom Technology (CHT) to ensure your signal stays clean even when you’re pushing the pedal hard.
- Materials & Durability: You are going to be stepping on this device for years. It needs to be housed in a rugged, lightweight material like aluminum. Plastic housings are common in budget models, but for professional use, a metal chassis and high-quality switches are non-negotiable for long-term reliability.
- Ease of Use & Maintenance: While you want control, you also need feedback. Visual indicators, such as LED gain-reduction meters, are incredibly helpful for seeing exactly how much your signal is being squashed. This prevents “over-compressing,” which can lead to a lifeless, flat sound.
By keeping these factors in mind, you can ensure that your next purchase isn’t just another gadget, but a foundational tool for your musical journey. To see how this model compares to others in the wider world of dynamic control, let’s take a look at our broader analysis.
While the MXR M87 Bass Compressor Effects Pedal with True Bypass 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:
- 【Advanced Compressor Pedal】Donner’s comprehensive pedal can smoothen out dynamics between the high and low frequencies without degrading the original sound, offering you a more even and robust...
- The first true advancement in our 2 and 4 knob compressor line. The new features are simple and straight forward
First Impressions: Unboxing the MXR M87 Bass Compressor Effects Pedal with True Bypass
Upon unboxing the MXR M87 Bass Compressor Effects Pedal with True Bypass, the first thing that struck me was the build quality. MXR has a reputation for building “tanks,” and this pedal is no exception. It feels incredibly solid in the hand, yet surprisingly lightweight thanks to its aluminum housing. This bundle also includes a four-pack of Hosa CFS-106 patch cables, which is a massive plus. There is nothing more frustrating than getting a new pedal and realizing you’re one cable short of completing your board. These cables are low-profile and high-quality, ensuring your signal stays pure from pedal to pedal.
The layout of the MXR M87 Bass Compressor Effects Pedal with True Bypass is clean and professional. Unlike many pedals that use cryptic names for their controls, MXR uses standard studio terminology: Release, Attack, Ratio, Input, and Output. This tells me immediately that this pedal is designed for players who want to understand and master their dynamics rather than just “guessing” with a single knob. Before even plugging it in, you can check the latest price and availability to see why this has become a staple on professional boards worldwide. The inclusion of the 10-LED gain reduction meter is the “wow” factor here—it’s a feature usually reserved for expensive rack-mount studio gear, and seeing it on a compact pedal is a game-changer for visual feedback.
Key Benefits
- Exceptional clarity thanks to Constant Headroom Technology (CHT).
- Precise visual feedback via the 10-LED gain-reduction status bar.
- Complete control over every compression parameter (Attack, Release, Ratio).
- True Bypass circuitry ensures your tone remains untouched when the pedal is off.
Limitations
- The learning curve for the five-knob interface might be steep for beginners.
- The compact knobs can be a bit fiddly to adjust on a dark stage.
Deep Dive Performance: Is the MXR M87 the Ultimate Bass Utility?
To truly understand the MXR M87 Bass Compressor Effects Pedal with True Bypass, we have to look at how it behaves under real-world pressure. I tested this pedal across three different basses: a vintage-style passive P-bass, a modern active 5-string, and a short-scale hollow body. In every scenario, the pedal demonstrated why it is considered one of the most transparent compressors on the market.
Unrivaled Transparency and Constant Headroom Technology
The standout feature of the MXR M87 Bass Compressor Effects Pedal with True Bypass is its “Constant Headroom Technology” (CHT). During our testing, we pushed the input gain significantly, expecting the usual “squashed” or “distorted” artifacts found in cheaper pedals. Instead, the M87 remained remarkably clean. It doesn’t “color” your tone in the way a vintage Ross-style compressor might. If you love the sound of your bass and your amp, this pedal is your best friend because it keeps that sound intact while simply fixing the levels. We found that even at high compression ratios, the low-end remained tight and punchy without becoming “muddy.” This is a crucial benefit for bassists who play in genres like metal or funk, where note definition is everything. You can a feature that really sets it apart is the internal 18-volt operation from a standard 9-volt source, which is the secret sauce behind that massive headroom.
The Precision of Studio-Style Controls
While many pedals simplify things down to a “Sensitivity” and “Volume” knob, the MXR M87 Bass Compressor Effects Pedal with True Bypass gives you the keys to the kingdom. Having independent Attack and Release controls allowed us to fine-tune the “snap” of the notes. For example, by slowing down the Attack, I could let the initial “thwack” of a slap note pass through uncompressed before the pedal clamped down on the tail of the note. This creates a sound that is both aggressive and controlled. The four selectable ratios (4, 8, 12, and 20) cover everything from subtle smoothing to “brick-wall” limiting. In our studio sessions, we found the 4:1 ratio to be perfect for general fingerstyle playing, while the 20:1 ratio acted as an excellent limiter for slap-heavy sections, preventing any unwanted clipping in the PA system. The flexibility here is simply unmatched in this price bracket.
The Game-Changing LED Gain Reduction Meter
We cannot emphasize enough how much the 10-LED meter improves the user experience. Compression is often an “invisible” effect—you feel it more than you hear it. This can lead players to over-compress, which kills the “life” of the music. With the MXR M87 Bass Compressor Effects Pedal with True Bypass, you have a real-time visual map of exactly how much gain is being reduced. When I was playing, I could see the lights dance in response to my touch. This allowed me to set the Input knob perfectly; I adjusted it so that the lights only hit the middle of the meter during my loudest peaks. This visual confirmation is a feature we found essential for consistent performance. It turns the guesswork of compression into a precise science, making it much easier to dial in your sound during a frantic soundcheck.
Build Quality, True Bypass, and the Bundle Value
The physical design of the MXR M87 Bass Compressor Effects Pedal with True Bypass is classic Dunlop/MXR—a lightweight, tough aluminum housing that can withstand the rigors of the road. During our evaluation, the True Bypass switch performed flawlessly, introducing zero “pop” or signal degradation when the effect was disengaged. This is vital for those of us with large pedalboards where signal chain integrity is a constant battle. Furthermore, the inclusion of the Hosa patch cables in this specific bundle adds significant value. Hosa cables are known for their reliability and oxygen-free copper conductors, and having four of them ready to go means you can immediately integrate the M87 and perhaps three other pedals into your chain without an extra trip to the music store. It’s a thoughtful touch that enhances the overall “pro” feel of the package.
What Other Users Are Saying
The general sentiment surrounding the MXR M87 Bass Compressor Effects Pedal with True Bypass is overwhelmingly positive, especially regarding its ability to balance various playing techniques. One user noted that over the years, they had worked on their touch to keep their low end even with higher notes, but this pedal “helps a lot” with that struggle, while also aiding in sustain and harmonics. This echoes our findings that the M87 is a “utility” that makes the player’s life easier. We also saw feedback from a user who mentioned that switching between finger and slap styles no longer required manual volume adjustments—a common headache for gigging bassists. Another reviewer simply stated, “Since implementing this pedal, I’ve had a ton of comments on how great my tone sounded,” highlighting the “invisible” but professional polish this pedal adds.
On the more emotional side, one parent shared that their son, a bass player, was “thrilled” with the pedal. This speaks to the M87’s reputation as a “must-have” item that even younger players recognize as a standard. While we didn’t find many negative reviews, some users online have mentioned that the small knobs can be hard to see in pitch-black club environments. However, most agree that once you’ve set your parameters, the LED meter is all you need to look at. The consensus is clear: this is a professional-grade tool that delivers exactly what it promises—uncolored, studio-quality compression in a stompbox format.
Comparing the MXR M87 to Top Alternatives
While the MXR M87 Bass Compressor Effects Pedal with True Bypass is a powerhouse, it’s worth looking at how it compares to other popular options on the market to see which fits your specific needs.
1. Keeley Compressor Plus Pedal
- The first true advancement in our 2 and 4 knob compressor line. The new features are simple and straight forward
- There is a simple Release Switch that is tuned for single coils or humbuckers. No more wondering if you have the attack or release set right
The Keeley Compressor Plus Pedal is a legend in the guitar world, and while it works beautifully on bass, it offers a different philosophy than the MXR. The Keeley features a “Blend” knob, which allows you to mix your dry, uncompressed signal with the compressed signal. This is a fantastic feature for maintaining the ultimate “attack” of your notes. However, the Keeley lacks the comprehensive LED metering and the specific Attack/Release/Ratio controls of the MXR. If you want a “warmer” sound with parallel compression capabilities, the Keeley is a strong contender. But if you want a dedicated bass tool with maximum transparency and visual feedback, the MXR is the superior choice for low-end frequencies.
2. JOYO JF-10 Dyna Compressor Pedal for Electric Guitar & Bass
- TRANSPARENT, STUDIO-STYLE ANALOG COMPRESSION: The JF-10 delivers smooth, natural compression that subtly polishes your sound without squashing your tone. Players describe it as "very transparent" and...
- 3-KNOB CONTROL – SUSTAIN, ATTACK & LEVEL: Sustain adjusts compression amount, Attack controls how quickly it engages, and Level compensates output volume. The Attack knob is especially useful for...
The JOYO JF-10 Dyna Compressor Pedal for Electric Guitar & Bass is the “budget king” in this comparison. It is a recreation of the classic Ross compressor circuit, which is known for its distinct “squash” and coloring of the tone. It is much simpler to use, featuring only Sustain, Attack, and Level knobs. While it is incredibly affordable and serves as a great entry point, it lacks the professional headroom and the transparent nature of the MXR M87 Bass Compressor Effects Pedal with True Bypass. We would recommend the JOYO for beginners or those on a strict budget who want a “fun” effect, but for serious tone shaping and studio-level performance, the MXR is in a completely different league.
3. Behringer CS400 Ultimate Compressor Sustainer Pedal
- Get super-smooth compression and endless sustain
- This BEHRINGER product has been designed to compete head to head with leading products on the market
The Behringer CS400 Ultimate Compressor Sustainer Pedal is an ultra-affordable option aimed at those who are just starting to experiment with their sound. It features basic controls for Level, Tone, Attack, and Sustain. While it gets the job done for home practice, it is housed in a plastic casing and lacks the True Bypass and “Constant Headroom” of the MXR. In our experience, the CS400 is a “utility” for those who aren’t yet ready to commit to a professional board. Compared to the MXR M87 Bass Compressor Effects Pedal with True Bypass, the Behringer feels like a toy, whereas the MXR feels like a piece of high-end studio equipment. If you are gigging, the durability of the MXR makes it well worth the extra investment.
The Final Verdict: Is the MXR M87 Your Next “Always-On” Pedal?
After extensive testing and comparison, the MXR M87 Bass Compressor Effects Pedal with True Bypass stands out as one of the most capable and transparent compression pedals available today. Its combination of studio-grade controls and a brilliant visual LED meter makes it an essential tool for any bassist who takes their tone seriously. Whether you are trying to even out your slap-to-finger transitions or you simply want your bass to sit “right” in the mix, this pedal delivers with clinical precision and zero tonal coloration. It’s built like a tank, preserves your signal integrity with True Bypass, and provides the headroom necessary for modern high-output instruments.
We highly recommend the MXR M87 Bass Compressor Effects Pedal with True Bypass for professional gigging musicians and home recording enthusiasts alike. It solves the dynamic range problem without sacrificing the character of your instrument. If you are ready to take your low-end from “raw” to “refined,” this is the pedal that will get you there. Don’t let your tone get lost in the noise—take control of your dynamics today and experience the studio-quality difference for yourself.
Last update on 2026-06-27 / Affiliate links / Images from Amazon Product Advertising API