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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-03 · 7 min read · Independent comparison
• Cambridge Audio Melomania P100 — biggest strength: an over-ear Bluetooth headphone with adaptive noise cancelling, up to 100 hours of playback and a user-replaceable battery, so it's built to be a daily driver for years rather than a gadget.
• Cambridge Audio Melomania P100 — biggest trade-off: it's a full-size over-ear headphone (0.7 kg shipping weight, plastic enclosure), so it's a bag item, not something that disappears in a pocket, and it only does its best work over Bluetooth or the 3.5 mm cable.
• Fosi Audio MD3 — biggest strength: a 50 g, 12 mm-thin portable DAC/headphone amp with an ESS ES9039Q2M DAC, four ES9603Q amplifier chips and both 3.5 mm single-ended and 4.4 mm balanced outputs.
• Fosi Audio MD3 — biggest trade-off: it makes no sound on its own. It has no battery and no drivers of its own — it needs a source device and a pair of wired headphones to do anything.
• Who each is for: the Melomania P100 is for someone who wants one finished product — wireless, noise-cancelling, long-running. The MD3 is for someone who already owns wired headphones or IEMs and wants to hear them properly from a phone, tablet, laptop or console.
The Melomania P100 is a complete listening product. You charge it, pair it, and you're done. Its headline number is battery life: up to 100 hours of playback, with a quick-charge claim of five minutes giving up to four hours of listening. That combination matters more than it sounds. Most people don't want to think about charging headphones at all, and a figure measured in days rather than hours changes how you use them — you stop topping them up "just in case."
The second thing that stands out in the specs is repairability. Cambridge Audio made the battery and the earcups user-replaceable, which is unusual in a category where the battery is normally the thing that kills the product. Pair that with the included carry case, USB-C to USB-C cable and USB-C to 3.5 mm cable, and the package is clearly aimed at long-term ownership rather than a one-season novelty.
On the audio side, the P100 SE is well equipped. It supports aptX Lossless, aptX Adaptive and high-resolution transmission up to 24-bit/96 kHz, runs a dynamic driver with class AB amplification, and offers Adaptive Active Noise Cancelling, wear detection, multipoint connection, and a 7-band adjustable EQ plus DynamEQ dynamic adaptive equalisation through the Melomania Connect app. There's a gaming/low-latency mode too. Controls run through the app or voice assistants.
Fosi Audio MD3: Who It's For
The MD3 solves a completely different problem. It's a portable DAC and headphone amplifier — the thing you plug between your phone, tablet, laptop or console and your wired headphones. Inside it uses an ESS ES9039Q2M DAC chip alongside four ES9603Q amplifier chips, with distortion-plus-noise as low as 0.00075% and frequency response from 20 Hz to 48 kHz. It's rated for headphones from 16 to 300 ohms, which covers everything from sensitive IEMs to many full-size studio models.
The physical design is where Fosi Audio has clearly had fun. It weighs 50 g and is 12 mm thick, with a sandblasted aluminium unibody, CNC dot-matrix lettering, and an N52 magnet leather back panel so it sticks to the back of your phone. There's a 1.28-inch round LCD that shows volume and playback status, supports custom images and animated images, and a "Vista" button with tactile feedback. Volume is 100-step with volume memory. Two USB-C ports handle charging and playback separately, so you can power it while listening. Outputs are 3.5 mm single-ended and 4.4 mm balanced, delivering 80 mW and 180 mW respectively at 32 ohms.
Compatibility is broad: UAC 2.0 for high-resolution audio, UAC 1.0 for PS5 and Switch, plus iPhone 15, Android, iPad, Mac and Windows. In other words, it turns almost any modern device with a USB-C port into a proper headphone source.
Who should buy it: anyone with decent wired headphones or IEMs who feels their phone or laptop output is the weak link — especially if they also game on a console and want one small box that handles both. Who should skip it: if you want wireless listening, active noise cancelling, or a product that works with zero setup, the MD3 is the wrong tool. It also can't drive very demanding high-impedance planar headphones beyond its 300-ohm rating as comfortably as a desktop amp would.
• Best for battery life → Cambridge Audio Melomania P100. Up to 100 hours, plus a fast-charge top-up and a battery you can replace yourself.
• Best for portability in the strictest sense → Fosi Audio MD3. 50 g, 12 mm thick, magnetically attached to your phone.
• Best for noise cancelling → Cambridge Audio Melomania P100. Adaptive ANC and wear detection are built in; the MD3 has no noise control at all.
• Best for sound quality with wired headphones you already own → Fosi Audio MD3. A dedicated DAC and four amplifier chips with 4.4 mm balanced output is a fundamentally different approach from a Bluetooth chipset.
• Best for calls, meetings and multipoint switching → Cambridge Audio Melomania P100. Multipoint plus app control and voice-assistant support.
• Best for gaming → depends on the setup. The P100 offers a low-latency gaming mode wirelessly; the MD3 offers UAC 1.0 compatibility with PS5 and Switch over USB, which suits wired console setups.
• Best for long-term ownership → Cambridge Audio Melomania P100. Replaceable battery and earcups, plus a two-year manufacturer warranty.
• Best for a phone-first listener who hates dongles → Fosi Audio MD3. It's still a dongle, but a well-built, self-powered one with a screen and volume memory, so it doesn't feel like a compromise.
• If you want one purchase and nothing else → Cambridge Audio Melomania P100. If you already own good wired headphones and want to unlock them → Fosi Audio MD3.
In my opinion, the Cambridge Audio Melomania P100 is the one I'd buy for most people, because it's a finished product: wireless, noise-cancelling, 100-hour battery, replaceable battery and earcups, app EQ, multipoint. It solves a whole set of daily needs with one box.
I'd only steer you to the Fosi Audio MD3 if you already own wired headphones or IEMs you love, and you want to hear them properly from your phone, laptop or console. In that specific situation the MD3 is the smarter buy — it's a serious little DAC/amp with balanced output and a screen, and it costs nothing in pocket space.
Check the current price on Amazon for both before deciding, since the value calculation changes with whatever each one is going for when you read this.
They aren't competing for the same job. The P100 is a self-contained wireless headphone with ANC and up to 100 hours of playback. The MD3 is a DAC/amp that needs a source and wired headphones. For standalone listening, the P100 wins; for upgrading wired gear, the MD3 wins.
No. It has no speakers and no battery — it processes and amplifies the audio signal from a connected device, then sends it to whatever you plug into the 3.5 mm or 4.4 mm output. You need a source device and wired headphones.
Yes. It ships with a USB-C to 3.5 mm jack cable and supports Bluetooth, so you can use it wirelessly or wired. It also supports aptX Lossless and high-resolution audio up to 24-bit/96 kHz over Bluetooth.
The P100 is designed around longevity — the battery and earcups are user-replaceable, it comes with a carry case, and it carries a two-year manufacturer warranty. The MD3 is built from a sandblasted aluminium unibody, which is sturdy, but it depends on a connected device and cable, so the cable and port are the parts most likely to see wear.
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