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Marshall Monitor III specifications and in-depth review

Marshall Monitor III

Manufacturer: Marshall

The Marshall Monitor III is an over-ear headphone that combines wireless and wired connectivity with a foldable, travel-ready design. Weighing 250 g, it includes a travel bag and a detachable, tangle-free cable, making it well-suited for use on the move. A standout feature is its 100-hour battery life, which drops to 70 hours when active noise cancellation is enabled — a trade-off that still places it among longer-lasting options in its category.

On the connectivity side, the Monitor III runs on Bluetooth 5.3 with support for AAC and Bluetooth LE Audio, though it does not include aptX, LDAC, or NFC pairing. Its 32 mm drivers cover a frequency range of 20 Hz to 20,000 Hz, with an impedance of 35 Ohms and a sound pressure level of 117 dB/mW. The headphone also features passive noise reduction alongside its active noise cancellation, an ambient sound mode, in-ear detection for automatic playback pausing, a noise-canceling microphone, and multipoint connectivity for up to two devices simultaneously. Charging is handled via USB Type-C with a 2.5-hour charge time.

Pros
  • Battery life reaches 100 hours on a single charge, dropping to a still-generous 70 hours with ANC enabled
  • Folds flat and includes a travel bag, making it easy to pack and carry
  • Supports multipoint connection to two devices at once, allowing seamless switching between sources
  • Both active noise cancellation and passive noise reduction are present, offering dual-layer sound isolation
  • In-ear detection automatically pauses playback when the headphones are taken off
  • The detachable, tangle-free cable provides a wired fallback when wireless is not an option
Cons
  • Bluetooth range is limited to 10 m, which restricts movement away from the source device
  • No support for high-resolution audio codecs such as aptX, LDAC, or LDHC
  • Wireless charging is not available, requiring a physical USB-C connection every time
  • NFC and fast pairing are both absent, making the initial connection process more manual
  • No water resistance of any kind, limiting use in wet or outdoor conditions
  • A mute function is not included, which may be inconvenient during calls
Who is this for?

The Marshall Monitor III suits users who need long listening sessions without frequent recharging, given its 100-hour battery life and 70-hour ANC endurance. Its foldable build, included travel bag, and detachable cable make it a practical choice for commuters and frequent travelers who want a reliable over-ear headphone that packs away easily. The combination of active noise cancellation, passive noise reduction, ambient sound mode, and in-ear detection also makes it well-matched for people who regularly shift between focused listening and needing awareness of their surroundings, such as those working in open or shared environments.

Who is this NOT for?

Users who prioritize high-resolution wireless audio will find the Monitor III lacking, as it supports neither aptX, LDAC, nor LDHC — codecs commonly sought by audiophiles wanting lossless or near-lossless streaming. The 10 m Bluetooth range makes it a poor fit for situations requiring freedom of movement away from the audio source, such as moving between rooms or working in large open spaces. Additionally, the absence of any water resistance means it is unsuitable for outdoor or sport use in rain or high-humidity conditions.

Design:

Fit Over-ear
weight 250 g
has a detachable cable ✓
water resistance None
can be folded ✓
is designed for kids ✕
has a tangle free cable ✓
travel bag is included ✓
has an open-back design ✕
has stereo speakers ✓

The Marshall Monitor III is an over-ear headphone with a closed-back design and stereo speakers, weighing 250 g. It features a foldable build and comes bundled with a travel bag, making it practical to pack away when not in use. The cable is both detachable and tangle-free, adding to its everyday convenience. Water resistance is not included, and the headphone is not intended for children.

Sound quality:

has active noise cancellation (ANC) ✓
lowest frequency 20 Hz
highest frequency 20000 Hz
driver unit size 32 mm
impedance 35 Ohms
supports spatial audio ✕
sound pressure level 117 dB/mW
has a neodymium magnet ✕
has passive noise reduction ✓

The Marshall Monitor III covers a full frequency range of 20 Hz to 20,000 Hz through 32 mm drivers, with an impedance of 35 Ohms and a sound pressure level of 117 dB/mW. It includes both active noise cancellation and passive noise reduction, offering two layers of isolation from ambient sound. Spatial audio is not supported, and the drivers do not use a neodymium magnet.

Power:

Battery life 100 hours
Battery life (ANC) 70 hours
charge time 2.5 hours
Has USB Type-C ✓
has a battery level indicator ✓
has wireless charging ✕
Has a solar power battery ✕
has a rechargeable battery ✓
has a removable battery ✕

The Marshall Monitor III is equipped with a rechargeable battery offering up to 100 hours of playback, which reduces to 70 hours when active noise cancellation is active. Charging is done via USB Type-C and takes 2.5 hours to complete. A battery level indicator is included, so remaining charge is easy to check at a glance. The battery is not removable, and neither wireless charging nor solar charging is supported.

Connectivity:

connectivity Wireless & wired
Bluetooth version 5.3
has aptX Adaptive ✕
has aptX ✕
has LDAC ✕
has LDHC ✕
has Bluetooth LE Audio ✓
has aptX Low Latency ✕
has aptX HD ✕
has aptX Lossless ✕
has AAC ✓
has Auracast ✕
maximum Bluetooth range 10 m
has fast pairing ✕
supports Bluetooth pairing using NFC ✕

The Marshall Monitor III supports both wireless and wired connectivity, using Bluetooth 5.3 with a maximum range of 10 m. It is compatible with the AAC codec and includes Bluetooth LE Audio, though aptX, aptX Adaptive, aptX HD, aptX Low Latency, aptX Lossless, LDAC, LDHC, and Auracast are all absent. Pairing options are limited to standard Bluetooth, as neither fast pairing nor NFC pairing is available.

Features:

has a noise-canceling microphone ✓
has ambient sound mode ✓
has in/on-ear detection ✓
has a mute function ✕
multipoint count 2
control panel placed on a device ✓
can be used as a headset ✓
Has an in-line control panel ✕

The Marshall Monitor III can be used as a headset, featuring a noise-canceling microphone and controls placed directly on the earcup — there is no in-line control panel on the cable. It supports multipoint connectivity for up to two devices simultaneously and includes an ambient sound mode for awareness of surrounding audio. In-ear detection allows music to pause automatically when the headphones are removed, though a dedicated mute function is not available.

Final Verdict

The Marshall Monitor III is a well-rounded over-ear headphone built around practical, everyday use. Its standout quality is undoubtedly its exceptional battery endurance — 100 hours of wireless playback, with ANC remaining usable for 70 hours — which, combined with a foldable design and included travel bag, makes it a dependable companion for commuters and frequent travelers. The dual-layer noise isolation, multipoint connectivity, and in-ear detection round out a feature set that caters to users who value convenience and versatility over audiophile-grade wireless fidelity. Those seeking high-resolution codec support or extended Bluetooth range may find its connectivity options limiting, but for listeners who prioritize endurance, portability, and practical daily features, the Marshall Monitor III delivers a coherent and capable package.

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