Main trade-off
Cambridge Audio Melomania P100 SE
At 330 g it adds 80 g over Marshall. Its proprietary USB-C-to-3.5 mm lead is not an ordinary phone adapter.
Head-to-head
Cambridge P100 SE vs Marshall Monitor III: an owner-replaceable battery or an 80 g lighter travel pair
The short answer
P100 SE has an owner-replaceable battery, while Monitor III weighs 80 g less and folds inward. Choose Cambridge if you want to handle battery upkeep yourself and use USB music at a desk. Choose Marshall when daily carrying matters more. Try the fit before buying, and compare ANC-on battery figures rather than the shared 100-hour headline.
Before you choose
The reasoning and the trade-offs
Balance future repairs against the weight you carry every day
P100 SE’s owner-replaceable battery is attractive if one pair serves both work and leisure for several years. But for a commuter already carrying a laptop and lunch, Marshall makes a different contribution every day. Its 250 g body is 80 g lighter than P100 SE, and its documented inward fold helps pack the headphone away. That is a 24% reduction in headphone mass, not a promise of 24% more comfort or a specific amount of bag space. If your current pair becomes annoying to wear or carry before its battery ages, try Marshall’s physical fit before prioritizing future repairability.
What this is based on
(330 minus 250) divided by 330 = 24.2% less headphone mass. Supplied case mass and packed dimensions are not normalized. No personal lifting, neck-health or comfort outcome is inferred.
Main trade-off
Marshall Monitor III A.N.C.
Confirm local battery-service options before relying on a future repair. Its documented analog lead does not by itself establish digital USB audio or a USB microphone.
Cambridge Audio Melomania P100 SE
- Choose it for
- You want to replace the battery yourself with the correct part and instructions rather than arrange that job through a service provider.
- Your desk needs documented USB digital music input, with call compatibility checked separately.
- Main trade-off
- At 330 g it adds 80 g over Marshall. Its proprietary USB-C-to-3.5 mm lead is not an ordinary phone adapter.
Marshall Monitor III A.N.C.
- Choose it for
- You carry headphones every day and value the 250 g body and inward-folding design.
- Long ANC listening is important, and its 70-hour manufacturer maximum is useful without treating it as a guarantee.
- Main trade-off
- Confirm local battery-service options before relying on a future repair. Its documented analog lead does not by itself establish digital USB audio or a USB microphone.
About this comparison
Cambridge P100 SE vs Marshall Monitor III ANC for commuting, long trips and keeping headphones for years. Compare weight, charging claims and repair routines.
These music-focused ANC headphones are plausible alternatives for a daily commute and a home desk. The real choice crosses portable handling with how the owner wants to maintain them.
Winner by situation
Start with what you need it to do
A documented owner battery-replacement route is a priority
Cambridge documents it. Confirm Marshall’s local battery-service route before buying.
- Cambridge Audio Melomania P100 SE
- Better fit
- Marshall Monitor III A.N.C.
- Depends
You want the lighter headphone and an inward fold
Marshall is 250 g rather than 330 g, with a documented inward-folding routine.
- Cambridge Audio Melomania P100 SE
- Caution
- Marshall Monitor III A.N.C.
- Better fit
Your computer needs documented USB digital music input
P100 SE explicitly supports it. The Marshall analog lead alone does not establish digital USB audio.
- Cambridge Audio Melomania P100 SE
- Better fit
- Marshall Monitor III A.N.C.
- Depends
You need a guaranteed week of calls and ANC on one charge
Neither manufacturer maximum establishes your call-heavy weekly runtime.
- Cambridge Audio Melomania P100 SE
- Depends
- Marshall Monitor III A.N.C.
- Depends
What matters in practice
The differences that matter
Balance future repairs against the weight you carry every day
P100 SE’s owner-replaceable battery is attractive if one pair serves both work and leisure for several years. But for a commuter already carrying a laptop and lunch, Marshall makes a different contribution every day. Its 250 g body is 80 g lighter than P100 SE, and its documented inward fold helps pack the headphone away. That is a 24% reduction in headphone mass, not a promise of 24% more comfort or a specific amount of bag space. If your current pair becomes annoying to wear or carry before its battery ages, try Marshall’s physical fit before prioritizing future repairability.
How we reached this conclusion
(330 minus 250) divided by 330 = 24.2% less headphone mass. Supplied case mass and packed dimensions are not normalized. No personal lifting, neck-health or comfort outcome is inferred.
Two 100-hour headlines are not two identical travel plans
The advertised 100 hours on both models applies with noise cancellation off. On a train or flight where ANC is the reason you brought them, the relevant figures are up to 60 hours for P100 SE and up to 70 for Marshall. Those come from different manufacturer conditions and do not prove ten extra real hours for Marshall. Cambridge also warns that higher-bandwidth codecs can consume more power, and its app cannot force a lower codec. Someone alternating a noisy journey with a quiet desk should plan charging around the modes actually used, rather than borrowing the quiet-mode maximum for the whole trip.
How we reached this conclusion
ANC-on versus ANC-off normalization, crossed with a mixed noisy and quiet routine. No matched test, guaranteed trip duration or linear battery extrapolation is claimed.
Repairability is two separate errands: the battery and the worn pads
For someone who dislikes arranging a service visit for everyday equipment, P100 SE provides a documented owner battery-replacement route with standard tools. Marshall separately documents twist-off replacement pads and offers authorized repair with availability depending on the market. Replacing sweaty or worn cushions therefore should not be confused with replacing the battery. Check the exact parts and local service route before deciding how long you expect to keep either model. Marshall’s US pad listing was out of stock when checked, a useful reminder that a replaceable design does not guarantee an immediate spare.
How we reached this conclusion
Documented user service and pad procedures crossed with dependence on one daily pair. No service price, repair duration, future stock or product lifetime is promised. Stock observation is dated October 4, 2026.
Check your own setup
Which headphones work with the way you listen?
Start with the way you listen. USB charging is not the same as USB audio, and some headphones need power even with a cable. These choices are examples until you apply yours.
Cambridge Audio Melomania P100 SE
Meets these checksBluetooth listening.
Marshall Monitor III A.N.C.
Meets these checksBluetooth listening.
Battery figures are manufacturer claims for the stated mode, not measured travel time. Volume, codec, calls and battery age change runtime. Closed earcups can still leak sound. Weight alone does not predict comfort. USB audio needs a compatible source and cable. This check does not assess sound quality, microphone quality or amplifier power.
Choice A
Cambridge Audio, Melomania P100 SE Blue
Melomania P100 SE
You want to replace the battery yourself with the correct part and instructions rather than arrange that job through a service provider.
- Best matched use
- You want to replace the battery yourself with the correct part and instructions rather than arrange that job through a service provider.
Checked facts
- Daily handling: 330 g
- ANC-on endurance: Up to 60 h, up to 100 h with ANC off
- Long-term upkeep: Owner-replaceable battery and pads
- Desk connection: Documented USB digital audio up to 24-bit/96 kHz
Choice B
Marshall, Monitor III A.N.C.
Monitor III A.N.C.
You carry headphones every day and value the 250 g body and inward-folding design.
- Best matched use
- You carry headphones every day and value the 250 g body and inward-folding design.
Checked facts
- Daily handling: 250 g and folds inward
- ANC-on endurance: Up to 70 h, up to 100 h with ANC off
- Long-term upkeep: Replaceable pads and market-dependent authorized repair
- Desk connection: Documented supplied USB-C-to-3.5 mm analog lead
Meaningful differences
What changes the fit
| What changes | Cambridge Audio Melomania P100 SE | Marshall Monitor III A.N.C. | Why it matters |
|---|---|---|---|
| Daily handling | 330 g | 250 g and folds inward | Marshall removes 80 g before counting the case or cables. Fit still needs a trial. |
| ANC-on endurance | Up to 60 h, up to 100 h with ANC off | Up to 70 h, up to 100 h with ANC off | The shared 100-hour headline hides different ANC-on claims. |
| Long-term upkeep | Owner-replaceable battery and pads | Replaceable pads and market-dependent authorized repair | Separate the battery service route from routine pad replacement. |
| Desk connection | Documented USB digital audio up to 24-bit/96 kHz | Documented supplied USB-C-to-3.5 mm analog lead | A USB-shaped socket does not prove the same audio modes. |
What you give up
Every choice has a cost
If you choose Cambridge Audio Melomania P100 SE
- The 100-hour headline assumes ANC is off. ANC use is rated up to 60 hours, with volume and codecs affecting the result.
If you choose Marshall Monitor III A.N.C.
- Replacement ear cushions exist, but availability can change. A replaceable part is not a promise that it is in stock when needed.
Recommendation switch
The decision flips if...
Owner battery replacement and direct USB music solve the daily need
Choose Cambridge Audio Melomania P100 SE. P100 SE documents both routes.
Daily carrying and a lighter physical fit matter more
Choose Marshall Monitor III A.N.C.. Marshall reduces stated headphone mass and folds inward.
What matters in practice
Before you choose
You want headphones that last for years, but you also have to carry and wear that choice every day.
What this comparison cannot tell you
- No matched ANC, sound, microphone or comfort test is claimed. Neither model is recommended here as hearing protection or as a guaranteed wet-weather or exercise headphone.
What the facts say
What the comparison shows
Useful conclusions from the current headphones comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Cambridge Audio Melomania P100 SE |
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| Marshall Monitor III A.N.C. |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Cambridge Audio Melomania P100 SE
You want to replace the battery yourself with the correct part and instructions rather than arrange that job through a service provider.
Your desk needs documented USB digital music input, with call compatibility checked separately.
See price & reviews on AmazonMarshall Monitor III A.N.C.
You carry headphones every day and value the 250 g body and inward-folding design.
Long ANC listening is important, and its 70-hour manufacturer maximum is useful without treating it as a guarantee.
See price & reviews on AmazonLinks open in a new tab.