Marshall Monitor II ANC vs Grado GW100x: Two Very Different Approaches to Wireless Audio

When shopping for wireless headphones, you'll quickly discover that not all models are created equal. Some prioritize convenience and versatility, while others focus purely on sound quality. The Marshall Monitor II ANC and Grado GW100x represent two fascinating extremes in this spectrum, each taking a fundamentally different approach to wireless audio.

At the time of writing, both headphones sit in the premium wireless category but serve completely different users. Understanding these differences is crucial because choosing the wrong approach for your needs can leave you disappointed, regardless of how well-engineered either product might be.

Understanding the Wireless Headphone Landscape

The wireless headphone market has evolved dramatically since Bluetooth audio first appeared. Early wireless headphones were plagued by poor sound quality, constant connectivity issues, and batteries that died faster than your phone. Today's wireless headphones have largely solved these problems, but they've split into distinct categories based on user priorities.

Modern wireless headphones must balance several competing demands: sound quality, battery life, noise isolation, comfort, and convenience features. The challenge is that excelling in one area often requires compromises in others. Active noise cancellation (ANC) – technology that uses microphones to detect ambient noise and creates inverse sound waves to cancel it out – requires extra processing power and battery drain. Open-back designs – where the back of the driver is open to air rather than sealed – provide spacious sound but leak audio to your surroundings.

The Marshall Monitor II ANC, released in 2019, represents the mainstream approach: closed-back over-ear headphones with active noise cancellation and comprehensive features. The Grado GW100x, launched in 2021, takes the road less traveled as one of the world's only open-back wireless headphones, prioritizing pure audio quality above all else.

Sound Quality: Where Philosophy Meets Performance

The Marshall Approach: Balanced Versatility

The Marshall Monitor II ANC employs 40mm dynamic drivers tuned to Marshall's signature sound. If you're familiar with Marshall guitar amplifiers, you'll recognize the philosophy here: warm, guitar-friendly tuning that makes rock and pop music sound engaging without sacrificing clarity in other genres.

Dynamic drivers work like tiny speakers, using a voice coil attached to a diaphragm that moves back and forth to create sound waves. The 40mm size strikes a balance between bass response and detail retrieval. Marshall has tuned these drivers to provide punchy bass that doesn't overwhelm the midrange frequencies where vocals and guitars live.

What sets the Marshall Monitor II ANC apart from many competitors is its customizable EQ through the companion app. You get three preset slots that you can customize, plus the ability to cycle through them using the physical M-button on the headphones. This flexibility means you can optimize the sound for different music genres or listening preferences.

The closed-back design creates what audiophiles call an "intimate" soundstage. Instead of feeling like musicians are performing in a large concert hall, it's more like listening in a well-treated studio. This works well for most music genres and is particularly effective for bass-heavy tracks where you want that controlled, punchy response.

The Grado Philosophy: Reference-Quality Wireless

The Grado GW100x takes an entirely different approach with its open-back design and larger 44mm drivers. Grado has been making high-end headphones since 1953, and their wireless models maintain the company's commitment to natural, uncolored sound reproduction.

The fourth-generation X Series drivers in the Grado GW100x represent significant engineering advancement. Grado redesigned the voice coil to reduce mass, increased the magnetic circuit strength, and reconfigured the diaphragm specifically for wireless use. This matters because wireless transmission can introduce subtle distortions that wired headphones don't face. The result is wireless performance that closely matches Grado's acclaimed wired models.

The open-back design is where things get interesting. Unlike closed-back headphones that seal your ears from the outside world, open-back designs allow air to flow freely through the driver. This creates a dramatically different listening experience – instead of sound appearing to come from inside your head, it feels like musicians are performing in the room around you.

This spacious soundstage comes with a significant trade-off: sound leakage. At moderate listening levels, people nearby will clearly hear what you're playing. Grado claims they've reduced leakage by 60% compared to their previous wireless model, but the Grado GW100x still isn't appropriate for offices, libraries, or public transportation.

Performance Metrics That Matter Most

When evaluating headphone sound quality, several technical specifications tell the story. Frequency response (measured in Hz) indicates how well headphones reproduce different pitches – human hearing typically spans 20Hz to 20,000Hz. Both models cover this range adequately, but the real differences lie in how they handle specific frequency ranges.

Impedance, measured in ohms, affects how much power headphones need to reach proper volume levels. The Marshall Monitor II ANC measures 19.3 ohms while the Grado GW100x sits at 38 ohms. Lower impedance generally means easier to drive from phones and portable devices, though both headphones work fine with typical smartphones.

Sensitivity, measured in decibels (dB), indicates how loud headphones get with a given amount of power. The Marshall achieves 99.08 dB while the Grado reaches 99.8 dB – essentially identical performance that ensures both get plenty loud without straining your device's battery.

The most important performance difference isn't captured in specifications: soundstage and imaging. The Grado GW100x creates a three-dimensional sound field where you can pinpoint individual instruments in space. The Marshall Monitor II ANC offers more controlled, focused presentation that works better for bass-heavy music and noisy environments.

Noise Management: Two Completely Different Strategies

Active Noise Cancellation vs Natural Openness

The Marshall Monitor II ANC employs sophisticated active noise cancellation technology. Multiple microphones continuously monitor ambient sound, and onboard processors generate inverse sound waves to cancel out consistent low-frequency noise like airplane engines, air conditioning, and traffic rumble.

Marshall's implementation includes 10 adjustable ANC levels through their app, plus a monitoring mode that deliberately lets ambient sound through when you need situational awareness. This flexibility is genuinely useful – you might want maximum noise cancellation on an airplane but lighter cancellation in an office where you need to hear colleagues.

The effectiveness is impressive for mid-frequency and low-frequency noise. Engine drone virtually disappears, and constant background noise like HVAC systems becomes barely noticeable. However, ANC is less effective against sudden, sharp sounds like voices or banging doors. For those situations, the closed-back design provides additional passive isolation.

The Grado GW100x takes the opposite approach entirely. The open-back design means you'll hear everything happening around you – which is exactly what Grado intends. This natural awareness can be safer when walking outdoors and more socially appropriate when family members need your attention.

But this openness makes the Grado GW100x unsuitable for noisy environments. Background noise will compete directly with your music since there's no isolation to separate them. In a quiet room, this isn't problematic. On a busy street or in an airplane, it makes listening at reasonable volumes nearly impossible.

Sound Leakage Considerations

Sound leakage deserves special attention because it affects everyone around you. The Marshall Monitor II ANC contains sound effectively – even at higher volumes, people sitting nearby won't be disturbed. This makes them appropriate for offices, libraries, and public transportation.

The Grado GW100x leaks sound significantly despite Grado's 60% reduction claims. At two-thirds volume, people across a medium-sized room will clearly hear your music. This isn't a flaw – it's an inherent characteristic of open-back design. But it means these headphones are exclusively for private listening spaces.

Battery Performance and Connectivity

Power Management Philosophy

Battery life reveals another fundamental difference in design philosophy. The Marshall Monitor II ANC achieves 30 hours with ANC enabled or 45 hours with ANC disabled. This performance is competitive with other ANC headphones, but the power-hungry active noise cancellation clearly impacts runtime.

The Grado GW100x delivers an exceptional 46 hours at moderate listening levels. This impressive figure reflects the simpler design – no ANC processing, no companion app running continuously, and optimized wireless circuitry. For users who prioritize long listening sessions without charging interruptions, this advantage is substantial.

Both models support quick charging via USB-C, though with different approaches. The Marshall Monitor II ANC provides 5 hours of playback from a 15-minute charge – perfect for forgetting to charge overnight but needing headphones for your commute. The Grado GW100x requires 2 hours for a full charge but then runs for nearly two full days of typical listening.

Bluetooth Technology and Codec Support

Bluetooth codecs determine how audio gets compressed for wireless transmission. Higher-quality codecs preserve more musical information but require more battery power and compatible devices.

The Marshall Monitor II ANC supports standard SBC codec, which works with all Bluetooth devices but provides basic audio quality. This reflects Marshall's focus on broad compatibility over audiophile-grade wireless transmission.

The Grado GW100x supports aptX Adaptive, AAC, and SBC codecs. AptX Adaptive is particularly impressive because it dynamically adjusts compression based on your environment and connection quality. In quiet settings with a strong connection, it provides near-CD quality. In challenging wireless environments, it automatically reduces quality to maintain stable playback.

Both headphones include multipoint pairing, allowing connection to multiple devices simultaneously. This proves useful when switching between your phone and laptop throughout the day.

Comfort and Build Quality

Design Philosophy in Practice

Over-ear versus on-ear design significantly impacts long-term comfort. The Marshall Monitor II ANC uses over-ear design with memory foam ear cushions that completely surround your ears. This distributes weight evenly and creates better seal for noise isolation. However, the 320-gram weight can feel substantial during extended sessions, and some users report tight clamping force initially.

The Grado GW100x employs on-ear design, sitting on your ears rather than around them. At just 187 grams, they feel noticeably lighter and less imposing. The padded headband distributes weight effectively, making them comfortable for the multi-hour listening sessions that their 46-hour battery enables.

Neither model folds for travel, though for different reasons. The Marshall Monitor II ANC actually does fold – I was incorrect about this earlier. The Grado GW100x doesn't fold because it's designed primarily for stationary home use.

Build quality reflects each company's priorities. Marshall emphasizes premium materials and finish quality that looks impressive and feels substantial. Grado focuses on functional durability with less emphasis on luxury aesthetics. Both approaches work well for their intended use cases.

Use Cases and Home Theater Integration

Where Each Excels

The Marshall Monitor II ANC shines in versatile, real-world scenarios. Daily commuting becomes more pleasant when train noise disappears into the background. Office work benefits from the closed design that doesn't disturb colleagues while keeping you focused. Travel scenarios where you need both isolation and long battery life play to Marshall's strengths.

For home theater use, the Marshall Monitor II ANC works well for late-night movie watching without disturbing family members. The closed design contains sound effectively, and the warm tone complements dialogue and music soundtracks. However, the smaller soundstage means you won't get the immersive surround sound experience that some movies benefit from.

The Grado GW100x excels in dedicated listening environments. Critical music listening reveals details and spatial information that closed-back designs simply cannot match. The open soundstage makes acoustic recordings feel live and present in a way that's genuinely impressive for wireless headphones.

Home theater applications favor the Grado GW100x for their spacious presentation, assuming you're listening alone or with headphone-tolerant family members. Movies with excellent sound design – think anything mixed by Dolby Atmos – benefit from the three-dimensional soundstage that helps create immersive experiences. The natural sound signature makes dialogue clear without artificial enhancement.

When Technology Improvements Matter

Recent Developments

Since the Marshall Monitor II ANC launched in 2019, ANC technology has continued evolving. Newer competitors offer more sophisticated adaptive noise cancellation that automatically adjusts to your environment. Marshall's fixed approach still works well but feels less advanced compared to 2023's flagship models.

The Grado GW100x, arriving in 2021, benefits from more recent Bluetooth and driver developments. The aptX Adaptive support represents current best-practice for high-quality wireless audio, while the fourth-generation drivers incorporate lessons learned from earlier wireless attempts.

Both models will likely see successors that improve upon current limitations. Future Marshall models might add aptX codec support and more sophisticated ANC algorithms. Future Grado models could reduce sound leakage further while maintaining the open-back benefits.

Making Your Decision

Choosing Based on Priorities

Your choice between the Marshall Monitor II ANC and Grado GW100x should align with your primary use cases and sonic priorities.

Choose the Marshall Monitor II ANC if you need headphones that adapt to multiple environments. The active noise cancellation makes them suitable for commuting, traveling, and noisy offices. The closed design prevents disturbing others, making them socially appropriate anywhere. The comprehensive app support and voice assistant integration provide modern convenience features that many users appreciate.

The Grado GW100x serves a more specific but equally valid purpose. If sound quality trumps all other considerations, and you primarily listen in quiet, private spaces, they offer wireless performance that rivals high-end wired headphones. The exceptional battery life supports long listening sessions without interruption, and the unique open-back wireless experience isn't available elsewhere at this price point.

Value Considerations

At the time of writing, both models occupy similar price ranges in the premium wireless headphone segment. The Marshall Monitor II ANC costs slightly more, reflecting the additional engineering required for effective active noise cancellation and the comprehensive feature set.

Value assessment depends entirely on which features you'll actually use. If you need ANC and multi-environment versatility, the Marshall provides excellent value for its feature completeness. If you prioritize pure audio quality and have appropriate listening environments, the Grado offers exceptional value for its sonic performance.

The Bottom Line

These headphones represent fundamentally different approaches to wireless audio, and both execute their respective visions extremely well. The Marshall Monitor II ANC succeeds as a sophisticated, versatile tool for modern life. The Grado GW100x succeeds as a focused instrument for serious music listening.

Your choice shouldn't be based on which is "better" in absolute terms, but rather which approach better matches your listening habits, environments, and priorities. Both will serve their intended users exceptionally well – just make sure you understand what you're choosing before you buy.

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