Denon AH-C840NCW True Wireless Earbuds
- $249.00
$149.00- $249.00
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Product Details
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Denon AH-C840NCW True Wireless Earbuds with Active Noise Cancellation
Unrivalled Sound, All-Day Focus
Experience Denon's legendary high-performance sound in sleek, sweatproof earbuds designed for dynamic lifestyles. The AH-C840NCW combines Adaptive Hybrid Active Noise Cancellation, seamless connectivity, and up to 35 hours of total battery life, delivering effortless listening anywhere life takes you. Whether you're focusing on work, powering through a workout, or diving into your favorite playlist, these earbuds provide the perfect balance of sound isolation and ambient awareness.

Hand-tuned by Denon Sound Master Shinichi Yamauchi, the AH-C840NCW delivers the signature vivid and spacious sound that has defined Denon for over 110 years. Premium Free-Edge bio cellulose drivers adapted from flagship headphones ensure exceptional clarity and natural sound reproduction in a compact wireless package.
Adaptive Hybrid ANC
- Dynamic noise cancellation adjustment
- Transparency mode for awareness
- Optimizes to environment and fit
- Crystal-clear audio focus
Extended Battery Life
- 10 hours (ANC off) / 7 hours (ANC on)
- 35 hours total with charging case
- 5-minute quick charge for 1 hour playback
- Wireless charging case included
Premium Audio Heritage
- 12mm Free-Edge bio cellulose drivers
- Sound Master tuned by Shinichi Yamauchi
- Denon's vivid and spacious signature sound
- 5-band customizable EQ via app
Sound Master Craftsmanship
- Free-Edge Bio Cellulose Drivers: Premium 12mm drivers adapted from Denon's flagship headphones deliver exceptional detail and natural sound reproduction
- Master-Tuned Audio: Hand-tuned by Denon Sound Master Shinichi Yamauchi for the signature vivid and spacious sound profile that defines Denon
- Tonal Accuracy: Unlike consumer earbuds with artificial bass boosts, these earbuds deliver natural balance with precise imaging and refined detail across the frequency spectrum
- Japanese Audio Heritage: Over 110 years of audio innovation concentrated in wireless earbuds, maintaining reference-class standards in a compact form

Adaptive Hybrid Active Noise Cancellation
- Adaptive Intelligence: Automatically optimizes noise cancellation according to your environment and how you wear the earbuds for maximum effectiveness
- Hybrid Technology: Advanced dual-microphone system per earbud captures and cancels external noise while maintaining audio quality
- Transparency Mode: Stay aware of your surroundings when needed while still enjoying your music with environmental sound passthrough
- Focus Enhancement: Whether working, working out, or relaxing, adaptive ANC provides the right balance of isolation and awareness for any situation
Advanced Connectivity & Smart Features
- Bluetooth 5.3 with Multipoint: Connect to two devices simultaneously and seamlessly switch between calls on your laptop and music on your smartphone
- Auracast Ready: Future-ready technology for receiving public Bluetooth broadcasts and enhanced accessibility experiences
- Bluetooth LE Audio with LC3: State-of-the-art technology provides superior audio quality and power efficiency for extended listening
- Quick Pair Support: Google Fast Pair and Windows Swift Pair for instant, hassle-free connection to your devices

All-Day Comfort & Active Lifestyle Design
- Ergonomic Fit: Four sizes of premium silicone ear tips (S, M, L, S-Long) ensure optimal acoustic seal and long-term comfort for any ear shape
- IPX4 Water Resistance: Sweat and splash protection handles intense workouts and unexpected weather with confidence
- Touch Controls: Intuitive touch-sensitive controls on each earbud for seamless operation without physical buttons - fully customizable via the Denon app
- Secure Fit: Designed to stay in place during active movement, perfect for workouts, commuting, and daily activities
Crystal Clear Communication
- Dual Microphone Array: Two strategically placed microphones per earbud with beamforming technology focus on your voice while minimizing background noise
- Advanced Signal Processing: Exceptional voice clarity during calls even in noisy environments with priority vocal capture and ambient interference reduction
- Mono Mode Support: Flexible single-ear use for calls or extended listening sessions when you need to stay aware of surroundings
- Professional Call Quality: Crystal-clear, distraction-free communication for work calls, video conferences, and personal conversations

Comprehensive Denon Headphones App
- 5-Band Equalizer: Customize your sound signature with precise frequency adjustments while maintaining Denon's commitment to audio fidelity
- ANC Control: Switch between Active Noise Cancellation, Transparency mode, and off settings to match your environment and needs
- Touch Control Customization: Assign volume control, track navigation, voice assistant activation, or disable touch sensors to prevent accidental activation
- Multipoint Management: Control connection to multiple devices and manage seamless switching between audio sources
- Firmware Updates: Automatic updates ensure optimal performance and access to new features as they become available
Technical Specifications
- Drivers: 12mm Free-Edge Bio Cellulose (adapted from flagship headphones)
- Noise Cancellation: Adaptive Hybrid Active Noise Cancelling with Transparency Mode
- Bluetooth: Version 5.3 with Multipoint connectivity
- Codecs: LC3 (LE Audio), AAC, SBC
- Battery Life (Earbuds): 10 hours (ANC off) / 7 hours (ANC on)
- Total Battery Life: 35 hours (ANC off) / 24 hours (ANC on)
- Quick Charge: 5 minutes for 1 hour playback
- Charging: USB-C cable and Qi wireless charging case
- Water Resistance: IPX4 (sweat and splash protection)
- Microphones: Dual microphones per earbud with beamforming
- Ear Tips: Four sizes included (S, M, L, S-Long)
- Connectivity: Google Fast Pair, Windows Swift Pair, Auracast ready
- App Support: Comprehensive Denon Headphones app with EQ and customization
- Sound Tuning: Hand-tuned by Denon Sound Master Shinichi Yamauchi
Shipping & Return
xShipping Policy
We offer free standard shipping on all orders.
Products are dispatched from our warehouse in VIC. We deliver every order using Startrack or DHL tracked courier service.
Delivery Times
We offer rapid delivery as standard, though please allow 2-7 days for delivery.
Please note
We only deliver to Australian addresses. Deliveries cannot be made to PO Boxes.
Warranties
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law.
You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage.
You are also entitled to have the goods repaired or replaced if goods fail to be of acceptable quality and the failure does not amount to a major failure.
Handling time
Your item will be dispatched within 2 business days of receiving cleared payment.
Returns Policy
Incorrect Item Sent
In the unlikely event you have received an incorrect item, please contact us at marketing.au@soundunited.com within 48 hours of receipt and we will organise delivery of the correct item.
We will also organise the return of the incorrect item to us at no cost to you. We will despatch the correct item to you as soon as we receive your returned goods.
Incorrect Item Ordered
We offer an exchange or refund if you have purchased an incorrect item.
If you've ordered an incorrect item, we will happily exchange it for the correct item or offer a refund for the cost of the item ordered.
Please contact us to organise your exchange within 14 days of receiving the item, and return it to us within 14 days.
Any postage costs incurred from the return of the goods for exchange are the responsibility of the customer. Any difference in price for an exchanged item will need to be paid in full by the customer upon request of the exchange.
We will ship your replacement item as soon as we receive your returned goods.
Unwanted Items
For unwanted items we offer either an exchange or a refund if you change your mind.
If you decide that you do not want the item that you have purchased, then you may return it to us subject to a few conditions:
• Please contact us to request the return within 14 days of receiving the item, and return the item to us within 14 days.
• Any postage costs incurred from the return of the unwanted item(s) are the responsibility of the customer.
• All unwanted items should be returned unused in their original condition, and in the original packaging.
We will not be able to process an exchange or refund until the returned item has been received and processed by our Returns Department.
We do not charge a restocking or handling fee.
Please note: if any item is not returned in original condition, or is returned with any part of the packaging missing, we will not be able to offer an exchange or refund.
To request a return, contact us at marketing.au@soundunited.com.
Please note that returns will need to be sent to the following address: 86 Peter’s Avenue, Mulgrave VIC 3170, Australia.
Items sent back to us without first requesting a return will not be accepted.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not.
If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at marketing.au@soundunited.com.
Warranty
We are the manufacturer of all the products listed under our HiFi Bundles store name and you can be assured every item is genuine and brand new unless specifically described otherwise.
Every product we sell includes at least a 12-month warranty.
In the rare case that you do experience any problems, you can deal directly with us by calling 03 8542 1111.
About The Brand
x| Superior Sound Quality | Denon is celebrated for its high-quality sound performance, offering rich and immersive audio that appeals to both home users and audiophiles. |
| Innovative Design | Denon products feature a blend of modern and classic design, ensuring that both functionality and aesthetics are prioritized, with sleek looks that fit any home or entertainment setup. |
| Premium Materials | Denon uses high-quality materials such as aluminum and copper, which help to ensure durability and enhanced audio fidelity in their receivers and amplifiers. |
| Advanced Technology | Denon integrates cutting-edge technology, including HEOS multi-room audio and Dolby Atmos support, ensuring users enjoy the latest advancements in home audio. |
| Trusted by Professionals | Denon is a respected brand in both consumer and professional audio circles, with their AV receivers and amplifiers used in high-end home theaters and broadcast applications worldwide. |
| Wide Product Range | Denon offers a wide array of products, from AV receivers and amplifiers to headphones and home theater systems, designed to cater to various audio preferences and budgets. |
| Heritage and Legacy | Founded in 1910, Denon boasts over a century of expertise in the audio industry, known for its pioneering innovations and commitment to high-fidelity sound. |