Marshall Monitor III ANC vs Sennheiser HDB 630

Marshall Monitor III ANC

Marshall

7.7

Solid

Sennheiser HDB 630

Sennheiser

8.5

The best-sounding wireless headphone — if ANC isn't your priority

Marshall Monitor III ANC

What Reviewers Agree On

Iconic Marshall design stands out from the crowd
Warm, engaging sound signature great for rock and pop
70+ hour battery life is exceptional

Sennheiser HDB 630

What Reviewers Agree On

Best-sounding wireless headphone in its class — a warm-neutral, natural HD 600-style tuning that reviewers rank above the Sony WH-1000XM6, Bose QC Ultra and AirPods Max
Class-leading 50-60 hour battery life with ANC on (independently measured at ~54 hours), with a 10-minute quick charge returning ~7 hours and a ~1.5-2 hour full charge

Pros & Cons

Marshall Monitor III ANC

Pros

Iconic Marshall design stands out from the crowd
Warm, engaging sound signature great for rock and pop
70+ hour battery life is exceptional

Sennheiser HDB 630

Pros

Best-sounding wireless headphone in its class — a warm-neutral, natural HD 600-style tuning that reviewers rank above the Sony WH-1000XM6, Bose QC Ultra and AirPods Max

Detailed Comparison

Sound Quality

Marshall Monitor III ANC

Warm, punchy Marshall sound with good detail.

Classic Marshall sound — warm, slightly bass-forward, great for rock and pop genres
Customizable EQ in the Marshall app helps tailor sound to preference

Sennheiser HDB 630

The HDB 630's headline strength. Reviewers describe a warm-neutral, natural HD 600-series tuning with a standout midrange, an open and spacious soundstage for a closed-back, and enough neutrality to make it the most EQ-friendly wireless headphone on the market. The consensus is that it is the best-sounding wireless headphone at $500.

Crinacle calls it the best-sounding premium wireless headphone available today — nothing is over- or under-emphasised, everything just sounds natural and 'normal'.
The Headphone Show says that even without touching the app or EQ, the HDB 630 is the best-sounding wireless noise-cancelling headphone in its price range.

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Browse all reviews

True hi-res wired and USB-C listening at 24-bit/96kHz, plus an included BTD 700 dongle that delivers aptX Adaptive to any device — solving the iPhone/Windows codec gap in hardware

An exceptionally deep companion app with a 5-band professional parametric EQ (adjustable frequency, Q and shelves) that reviewers call the best EQ in any wireless headphone

Sound stays consistent as the battery drains and the headphone runs equally well wired, wireless or via the dongle — genuine flexibility for audiophiles

Good all-day comfort with plush, beefed-up padding and a folding, travel-friendly design

Deal Breakers

Active noise cancellation is the weakest of the premium flagships — clearly outclassed by Sony, Bose and Apple, especially on mid-frequency chatter and low rumble
The build is largely plastic and feels under-built for a $500 headphone, with reviewers wishing for metal in the headband or cups
Ear pads are not the most spacious — larger ears touch the inside, and the clamp can require a break after about two hours for some wearers
Microphone and call quality are mediocre, with the mic optimized only to ~10kHz so even the BTD 700 dongle's wideband codec brings little improvement
Touch controls are the slowest-responding of the premium pack, and some early units had touchpad/wear-detection bugs in multipoint mode

Class-leading 50-60 hour battery life with ANC on (independently measured at ~54 hours), with a 10-minute quick charge returning ~7 hours and a ~1.5-2 hour full charge

True hi-res wired and USB-C listening at 24-bit/96kHz, plus an included BTD 700 dongle that delivers aptX Adaptive to any device — solving the iPhone/Windows codec gap in hardware

An exceptionally deep companion app with a 5-band professional parametric EQ (adjustable frequency, Q and shelves) that reviewers call the best EQ in any wireless headphone

Sound stays consistent as the battery drains and the headphone runs equally well wired, wireless or via the dongle — genuine flexibility for audiophiles

Good all-day comfort with plush, beefed-up padding and a folding, travel-friendly design

Cons

Active noise cancellation is the weakest of the premium flagships — clearly outclassed by Sony, Bose and Apple, especially on mid-frequency chatter and low rumble
The build is largely plastic and feels under-built for a $500 headphone, with reviewers wishing for metal in the headband or cups
Ear pads are not the most spacious — larger ears touch the inside, and the clamp can require a break after about two hours for some wearers
Microphone and call quality are mediocre, with the mic optimized only to ~10kHz so even the BTD 700 dongle's wideband codec brings little improvement
Touch controls are the slowest-responding of the premium pack, and some early units had touchpad/wear-detection bugs in multipoint mode

GadgetryTech calls it the best-sounding active Bluetooth headphone they've ever heard out of the box — tuned better than most or all closed-back Bluetooth headphones.

The tuning carries classic HD 600-series traits — a warm-neutral balance and a great midrange — though one reviewer flags a slightly slow bass.

The midrange is the standout of the tuning, and Picky Audio named the HDB 630 best-sounding headphone of 2025 for its rare balanced tuning.

There is a slight forward character in the 1-2kHz midrange and a low-treble forwardness around 3-4kHz; the bass stands out in good ways without being a bass-boost machine.

Joshua Valour says soundstage width, placement and fidelity keep up with the best closed-backs, though they still can't match the best open-backs for soundstage.

A Reddit owner describes it as the most crystal-clear, almost open-back-sounding closed-back headphone they have ever heard, and was surprised by the soundstage.

Soundnews estimates soundstage and depth improved by roughly 20-25% over the Momentum 4.

Dissent: an older review of a different Sennheiser model warns the brand's bass-heavy tunings aren't ideal for classical or vocal music — but HDB 630 reviewers consistently describe a far more neutral, balanced signature.