The catch
Cambridge Audio Melomania P100 SE
It weighs 330 g, which is 80 g more than Marshall. The USB-C-to-3.5 mm lead it uses is proprietary and not an ordinary phone adapter.
Side by side
Cambridge P100 SE vs Marshall Monitor III Compared: a battery the owner can replace or a travel pair that is 80 g lighter
Quick verdict
The battery in P100 SE can be replaced by its owner, whereas Monitor III weighs 80 g less and folds inward. Cambridge is the pick if you want to look after the battery yourself and play USB music at a desk. Marshall is the pick when carrying it every day matters more. Try the fit before you buy, and compare ANC-on battery figures and not the shared 100-hour headline.
Before you buy
Why, and what it costs you
Compare future repair options with the weight you carry daily
If one pair has to cover both work and leisure for several years, P100 SE’s owner-replaceable battery has real appeal. A commuter who already lugs a laptop and lunch gets something else from Marshall every single day. It weighs 250 g, which is 80 g less than P100 SE, and its documented inward fold makes it easier to stow. That works out to 24% less headphone mass. It is not a promise of 24% more comfort or of any particular amount of bag space. If your current pair gets tiresome to wear or carry before its battery wears out, try Marshall on for fit before you put future repairability first.
Where this comes from
(330 minus 250) divided by 330 = 24.2% less headphone mass. The supplied case mass and packed dimensions are not normalized in this figure. We infer nothing about lifting, neck health or comfort.
The catch
Marshall Monitor III A.N.C.
Find out what battery service is available locally before you count on a future repair. The analog lead it documents does not on its own mean digital USB audio or a USB microphone.
Cambridge Audio Melomania P100 SE
- Why pick it
- You’d rather swap the battery yourself using the correct part and instructions than hand that job to a service provider.
- Documented USB digital music input is a must at your desk, and call compatibility needs its own check.
- The catch
- It weighs 330 g, which is 80 g more than Marshall. The USB-C-to-3.5 mm lead it uses is proprietary and not an ordinary phone adapter.
Marshall Monitor III A.N.C.
- Why pick it
- Headphones go with you every day, and the 250 g body and inward-folding design appeal to you.
- Long ANC listening matters to you, and its 70-hour manufacturer maximum is a helpful figure so long as you don’t treat it as a guarantee.
- The catch
- Find out what battery service is available locally before you count on a future repair. The analog lead it documents does not on its own mean digital USB audio or a USB microphone.
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What this page compares
Cambridge P100 SE and Marshall Monitor III ANC for commuting, long trips and holding on to headphones for years, with weight, charging claims and repair routines compared.
Either of these music-focused ANC headphones could serve a daily commute and a home desk. What separates them is how easy each is to carry around against how you want to look after it.
Which one fits
Pick the situations that sound like you
You put a documented owner battery-replacement route first
Cambridge has it documented. With Marshall, find out the local battery-service route before you buy.
- Cambridge Audio Melomania P100 SE
- Better fit
- Marshall Monitor III A.N.C.
- Depends
You want the lighter headphone, one that folds inward
Marshall weighs 250 g against 330 g, and its inward-folding routine is documented.
- Cambridge Audio Melomania P100 SE
- Caution
- Marshall Monitor III A.N.C.
- Better fit
You need documented USB digital music input from your computer
P100 SE states that it supports this. Marshall’s analog lead on its own does not show digital USB audio.
- Cambridge Audio Melomania P100 SE
- Better fit
- Marshall Monitor III A.N.C.
- Depends
You need a guarantee that one charge covers a week of calls with ANC
Neither manufacturer maximum tells you the runtime of a week heavy with calls.
- Cambridge Audio Melomania P100 SE
- Depends
- Marshall Monitor III A.N.C.
- Depends
In practice
Differences you will notice
Compare future repair options with the weight you carry daily
If one pair has to cover both work and leisure for several years, P100 SE’s owner-replaceable battery has real appeal. A commuter who already lugs a laptop and lunch gets something else from Marshall every single day. It weighs 250 g, which is 80 g less than P100 SE, and its documented inward fold makes it easier to stow. That works out to 24% less headphone mass. It is not a promise of 24% more comfort or of any particular amount of bag space. If your current pair gets tiresome to wear or carry before its battery wears out, try Marshall on for fit before you put future repairability first.
How we worked this out
(330 minus 250) divided by 330 = 24.2% less headphone mass. The supplied case mass and packed dimensions are not normalized in this figure. We infer nothing about lifting, neck health or comfort.
Two 100-hour headlines still add up to different travel plans
Both models advertise 100 hours, but only with noise cancellation off. If you brought them to a train or flight for the ANC, the numbers that matter are up to 60 hours for P100 SE and up to 70 for Marshall. They rest on different manufacturer conditions, so they do not prove ten extra real hours for Marshall. Cambridge also cautions that higher-bandwidth codecs can use more power, and its app cannot force a lower codec. If your days mix a noisy journey with a quiet desk, plan charging around the modes you really use instead of applying the quiet-mode maximum to the whole trip.
How we worked this out
This puts ANC-on and ANC-off figures on a common footing and applies them to a routine that mixes noisy and quiet stretches. We claim no matched test, no guaranteed trip duration and no linear battery extrapolation.
Repairability breaks into two separate errands, the battery and the worn pads
If booking a service visit for everyday gear puts you off, P100 SE documents a way for owners to replace the battery with standard tools. Marshall documents twist-off replacement pads as a separate matter and offers authorized repair, with availability depending on the market. So swapping sweaty or worn cushions is not the same job as swapping the battery. Before you decide how long you plan to keep either model, check the exact parts and your local service route. The US pad listing for Marshall was out of stock when checked, which shows that a replaceable design does not guarantee a spare on hand right away.
How we worked this out
This sets the documented owner-service and pad procedures against relying on one pair every day. We promise no service price, repair time, future stock or product lifetime. The stock observation is dated October 4, 2026.
Plug in your setup
Which headphones suit the way you listen?
Start with how you listen. Charging over USB is not the same as playing audio over USB, and some headphones need power even on a cable. These answers are placeholders until you apply your own.
Cambridge Audio Melomania P100 SE
Passes these checksPlays over Bluetooth.
Marshall Monitor III A.N.C.
Passes these checksPlays over Bluetooth.
Battery figures are maker claims for the stated mode. They do not reflect measured travel time. Volume, codec, calls and battery age all change runtime. Closed earcups can still leak some sound. Weight alone does not predict comfort. USB audio needs a compatible source and cable. This check does not judge sound quality, mic quality or amplifier power.
Option A
Cambridge Audio, Melomania P100 SE Blue
Melomania P100 SE
You’d rather swap the battery yourself using the correct part and instructions than hand that job to a service provider.
- Best for
- You’d rather swap the battery yourself using the correct part and instructions than hand that job to a service provider.
Facts we checked
- 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
Option B
Marshall, Monitor III A.N.C.
Monitor III A.N.C.
Headphones go with you every day, and the 250 g body and inward-folding design appeal to you.
- Best for
- Headphones go with you every day, and the 250 g body and inward-folding design appeal to you.
Facts we checked
- 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
Spec by spec
Where they really differ
| Spec | Cambridge Audio Melomania P100 SE | Marshall Monitor III A.N.C. | In practice |
|---|---|---|---|
| Daily handling | 330 g | 250 g and folds inward | Marshall takes off 80 g before the case or cables are counted. You still need to try the fit. |
| 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 | Behind the shared 100-hour headline sit different ANC-on claims. |
| Long-term upkeep | Owner-replaceable battery and pads | Replaceable pads and market-dependent authorized repair | Treat battery service and routine pad replacement as different jobs. |
| 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 mean the audio modes match. |
Trade-offs
What each pick costs you
With Cambridge Audio Melomania P100 SE
- The 100-hour headline is for ANC off. With ANC on, the rating is up to 60 hours, and volume and codecs change the result.
With Marshall Monitor III A.N.C.
- Replacement ear cushions exist, but whether you can get them can change. Just because a part is replaceable does not mean it is in stock when you need it.
Change of plan
When the answer changes
Owner battery replacement plus direct USB music cover your daily need
Go with Cambridge Audio Melomania P100 SE. Both routes are documented for P100 SE.
Everyday carrying and a lighter physical fit count for more
Go with Marshall Monitor III A.N.C.. Marshall has a lower stated headphone mass and folds inward.
Decision guide
Before you buy
Headphones meant to last for years are the goal, but you still carry and wear that choice every day.
What this page can’t tell you
- We claim no matched test of ANC, sound, microphone or comfort. Neither model is recommended here as hearing protection, or as a headphone guaranteed for wet weather or exercise.
By the numbers
What the data shows
What we found across the headphones we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Cambridge Audio Melomania P100 SE |
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| Marshall Monitor III A.N.C. |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Cambridge Audio Melomania P100 SE
You’d rather swap the battery yourself using the correct part and instructions than hand that job to a service provider.
Documented USB digital music input is a must at your desk, and call compatibility needs its own check.
See price & reviews on AmazonMarshall Monitor III A.N.C.
Headphones go with you every day, and the 250 g body and inward-folding design appeal to you.
Long ANC listening matters to you, and its 70-hour manufacturer maximum is a helpful figure so long as you don’t treat it as a guarantee.
See price & reviews on AmazonEach link opens in a new tab.
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