How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-24 · 7 min read · Independent comparison
One is a pair of raw 32Ω dynamic drivers meant to go inside broken headphones. The other is a finished Bluetooth headphone with active noise cancellation and a long battery spec. Comparing them head-to-head only makes sense when you think about the 40mm driver at the center of both products — one sells you the driver itself, the other builds a whole listening experience on top of one.
• SOULWIT 40mm — biggest strength: a direct replacement part that restores headphones you already love instead of replacing them, with a 32Ω dynamic driver tuned to sound like the originals.
• SOULWIT 40mm — biggest trade-off: installation requires soldering, and SOULWIT itself flags this as challenging for beginners. If you cannot solder, this part is not for you.
• Amazon Renewed Edifier W820NB — biggest strength: a complete wireless package with -49dB hybrid ANC, LDAC Hi-Res audio, spatial sound and up to 88 hours of playback.
• Amazon Renewed Edifier W820NB — biggest trade-off: it is a renewed unit with a 90-day limited warranty, and there is no headphone jack at all — it is wireless-only.
• Choose SOULWIT 40mm if you own a compatible wired headphone with a dead driver and you have the tools and skill to solder.
• Choose Amazon Renewed Edifier W820NB if you want working headphones today, with noise cancelling, app control and long battery life, and you are comfortable buying renewed.
The SOULWIT 40mm is a repair part, not a product you listen to on its own. It is a pair of 32Ω dynamic drivers, over-ear in placement, with a circular earpiece shape, sold as a one-pair set. The compatibility list is the real headline here: it covers a long run of popular wired models — QC35, QC45, QC25, QC15, QC2, QC3, AE2 and OE2, the Studio, Studio 2, Studio 3 and Studio Pro lines, Solo, Solo 2, Solo 3 and Solo 4, plus Razer Kraken 7.1, AKG K55 and Marshall Major II. If your headphone is on that list and one side has gone silent or started crackling, this is a targeted fix.
What it does best is bring a dead headphone back to life. SOULWIT describes the 32Ω drivers as delivering clear, balanced, distortion-free audio like the originals, which is exactly what you want from a replacement: not a sound upgrade, but a return to normal. Many people keep a favorite wired headphone for years precisely because they like how it sounds, and a driver swap keeps that sound instead of forcing you to relearn a new pair.
Amazon Renewed Edifier W820NB: Who It's For
The Amazon Renewed Edifier W820NB Plus Gen 2 is the opposite kind of purchase: a complete, finished wireless headphone. It is an over-ear design in dark gray, built from plastic, metal, fabric and foam, with soft memory foam ear cushions, and it folds for travel. There is no headphone jack — connectivity is Bluetooth 6.1 only, with a stated range of around 30 meters. The dynamic driver inside covers a 20Hz to 40kHz frequency range, and LDAC Hi-Res audio support means it can carry more detail over a compatible Bluetooth connection than a standard codec allows.
The feature list is where this headphone earns its place. Hybrid active noise cancellation is rated at -49dB, with multiple ANC modes that adapt to your environment, and you can switch ANC levels with physical buttons or fine-tune things in the EDIFIER ConneX app, which adds presets for sport, office and travel. There is spatial sound for a wider sense of stage, app-based EQ presets if you want to shape the tuning, and a volume guard that lets you set a maximum listening level. For calls, AI noise cancellation isolates your voice and reduces background noise, which matters if you take meetings on the move.
Battery life is the standout number: up to 88 hours of continuous use, dropping to 49 hours with ANC on, and fast charging that gives you 15 hours of playback from a 15-minute charge. That is the kind of endurance that makes charging anxiety disappear on a week of commuting.
Who should buy it: anyone who wants a working headphone immediately, values noise cancelling and long battery life, takes calls, and is fine with a wireless-only design. Who should skip it: anyone who needs a wired connection, anyone who wants a brand-new unit rather than a renewed one, and anyone who wants the reassurance of a long warranty — this renewed listing carries a 90-day limited warranty.
• Best for repairing headphones you already own → SOULWIT 40mm. It exists to restore a specific broken model, not to be a new headphone.
• Best for a complete listening experience out of the box → Amazon Renewed Edifier W820NB. Drivers, housing, battery and software are all included.
• Best for noise cancelling → Amazon Renewed Edifier W820NB. -49dB hybrid ANC with multiple adaptive modes is the clear pick.
• Best for battery life → Amazon Renewed Edifier W820NB. Up to 88 hours, or 49 with ANC, plus 15 hours from a 15-minute charge.
• Best for wired setups and zero charging → SOULWIT 40mm. A 32Ω dynamic driver in a wired headphone never needs a battery.
• Best for travel and commuting → Amazon Renewed Edifier W820NB. It folds, it is wireless, and the ANC modes include a travel preset.
• Best for hands-on tinkerers → SOULWIT 40mm. If soldering is a skill you already have, this is a satisfying and focused job.
• Best for calls → Amazon Renewed Edifier W820NB. AI noise cancellation for voice clarity is built in; the SOULWIT part has no microphone at all.
In my opinion, most shoppers should buy the Amazon Renewed Edifier W820NB. It is a finished product with noise cancelling, LDAC Hi-Res audio, spatial sound, app control and remarkable battery figures, and it works the moment it arrives. I would only steer you to the SOULWIT 40mm if you have a compatible headphone with a failed driver and you can solder — in that case it is the smarter, more focused buy, because it saves a headphone you already like rather than adding another one to the drawer. Check the current price on Amazon for both before deciding, since renewal listings and parts pricing move around. Judge them by what they are: one is a fix, the other is a headphone.
FAQ
what is 40mm driver in headphones
which driver is best for headphones
There is no single best driver size — it depends on the tuning and the housing around it. A 40mm dynamic driver is a common middle ground that balances air movement and control, which is why it appears in so many over-ear models. The SOULWIT 40mm targets an OEM-like sound at 32Ω, so it aims to match the original rather than outperform it.
is 40mm driver good for headphones
For over-ear headphones, yes — 40mm is a well-established size that can deliver clear, balanced sound when paired with good tuning. SOULWIT specifically describes its 32Ω drivers as clear, balanced and distortion-free, which is the goal of any solid replacement. Whether it sounds good in your headphone depends on the fit and the soldering job.
what are 40mm drivers in headphones
They are the dynamic speaker components that convert electrical signal into sound inside each earcup, sized at roughly 40mm across. In the Edifier W820NB, that driver is part of a wireless system with ANC, spatial sound and app EQ. In the SOULWIT listing, you get the driver pair on its own as a repair part for compatible wired models.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: Amazon Renewed TREBLAB Z2 vs JoySpark Kids, realme Buds T200 vs Amazon Renewed Edifier W80, Beats Studio3 vs Amazon Renewed Beats Studio Pro