Sennheiser HD 400U
Pure Sound. Instantly Connected.
Trade-in your old headphones for a refund*
Thank you for choosing well, for your old pairs.
To make the post submission experience of your trade-in assessment seamless, you would currently be able to submit your trade-in assessment with an eligible Sennheiser headphones purchase only. Great news, that these pair of Sennheiser headphones are eligible for you to complete and submit your online trade-in assessment.
If you haven't already, please be sure of adding these Sennheiser Headphones to cart firstly by going back and clicking on the BUY NOW button, which will add you trade-in submission automatically to your order, once have completed all the online assessments steps. You will get to see the assessed value for your trade-in submission on the checkout screen, eligible for being refunded once our trade-in partner has received your old pair of headphones.
What happens after submitting your Trade-in assessment can be found here.
Trade-in is temporarily unavailable, please try again later!
Step 01 of 06
Device Details
Every great listening journey has a next chapter. Assess the perceived value of your
old headphones in quick four steps and retain that value for an improved listening experience.
Your
estimate, instantly. Your upgrade, ready when you are.
Are your headphones fully functional?
Fully Functional Means:
- Headphones are able to power on, charge, and are able to hold charge (LED comes on when charging).
- Original charging case is included and is in good working condition i.e. charges both In-ears, hinge opens and close cleanly, no corrosion on the connectors, and pairs with the headphones).
Are your headphones in good physical condition?
Good Physical Condition Means:
- The headphones are not cracked, chipped, smashed, and the casing is not cracked.
- The headphones do not have heavy wear (light wear can be accepted).
- The original headphones charging case is not physically damaged, including no frame cracks.
- No corrosion or water damage.
Get an Estimate
Estimated Trade-in value
$250.00NZD - For your MOMENTUM 3 Wireless
Your headphones may not be eligible for trade-in. If you'd like to continue proceeding for your headphones, you may do so by contacting our partner directly at sennheiser.support@moorup.com.au.
Step 02 of 06
Get an Estimate
Estimated Trade-in value
$250.00NZD - For your MOMENTUM 3 Wireless
Great going! You are half way through your Trade-in assessment. If you do not wish to proceed further, simply close this, and your assessment will not be included with our order. Alternatively, please follow below steps to complete your submission. :
- We'll grab your contact details and address and share with our partner, Moorup, to start the return set up for your trade-in headphones.
- You'll receive further instructions on completing your trade-in from Moorup by email. Complete Trade-in T&Cs can be found here.
- Once Moorup receives your headphones, and validates the condition of the headphones and your identity, they will issue the refund to your nominated bank account. How Moorup handles your personal data can be found here.
Step 03 of 06
Personal Details
We need a few details to complete your trade-in request. Your information will be securely handled in accordance with Moorup's Privacy Policy.
Step 04 of 06
Banking Details
We need a few details to complete your trade-in request. Your information will be securely handled in accordance with Moorup's Privacy Policy.
Step 05 of 06
Prepare my Headphones
Prepare to return your headphones.
The final step is to prepare your headphones for returning to Moorup.
Return your headphones at local post office
Once submitted, we'll email you a barcode you can take to any New-Zealand Post location to return your headphones. All postage costs are covered by Moorup.
Disable Activation or Device Lock.
Before returning your headphones, all activation and headphones locks must be disabled. If a returned headphones is still locked, it will be assessed with a trade-in value of $0.
Not sure how to disable Activation Lock?
You can find a step-by-step guide on preparing your headphones for trade-in here at Moorup's Help Centre.
For your MOMENTUM 3 Wireless
Your trade-in request is received
Thank you for completing your trade-in assessment. Once your headphones are received and validated, $250 will be transferred to your nominated bank account details provided during the trade-in process by Moorup.
What's next?
You'll receive an email with the next steps. We'll need to verify your identity and once complete you'll receive pre-paid return postage details. Then it's time to drop that old pair of headphones off to New-Zealand Post.
When will I receive my payment?
Once we receive a thumbs up from Moorup, refunds are typically processed within 7 business days.
What if I need help?
If you have any questions or want to check the status of your trade-in, contact us at sennheiser@moorup.com.au.
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Signature Sennheiser Sound -
USB-C digital plug-and-play connection -
Removable cable system -
Inline remote & microphone -
Closed-back over-ear comfort
HD 400U
For more than 80 years, Sennheiser has stood for true sound. The HD 400U carries this legacy forward, delivering the unmistakable Signature Sennheiser Sound through a modern USB-C connection. No pairing. No batteries. Just pure, uncompressed audio, instantly.
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Signature Sennheiser Sound
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USB-C digital plug-and-play connection
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Removable cable system
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Inline remote & microphone
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Closed-back over-ear comfort
Features
- True Sennheiser sound: Balanced tuning with clear mids, detailed highs, and controlled bass
- Pure digital audio: USB C connection delivers stable, uncompressed sound without pairing or charging
- Flexible listening: Removable cable system lets you use the included USB-C cable or switch to an optional analog cable
- Stay connected: Inline remote and microphone for easy call handling and music control
- Comfortable closed-back design: Lightweight, foldable construction with passive noise isolation and soft, replaceable ear pads
- Built to last: Durable materials engineered for everyday reliability
Sound that stays true
Hear music the way the artist intended.
At the heart of the HD 400U is the Signature Sennheiser Sound. Carefully tuned to be balanced and natural, it reveals emotional detail that standard headphones often miss. Clear and expressive mids, shimmering highs, and deep yet controlled bass combine to create a listening experience that feels authentic, immersive, and true to the music.
Instant digital connection
Plug and play simplicity that lets the music speak.
The USB C digital connection delivers uncompressed audio directly from your device to your ears. With no pairing rituals or batteries to manage, the HD 400U offers a reliable, plug-and-play experience across compatible smartphones, tablets, laptops, and computers. Just connect and press play.
Instant digital connection
Comfortable design, ideal to carry around.
Lightweight and secure, the HD 400U is built for hours of comfortable listening. The closed-back over-ear design provides passive noise isolation while allowing the sound to breathe. Soft, replaceable ear pads and a foldable construction make it ideal for work, travel, and everyday use.
Instant digital connection
Flexible and functional
The removable cable system gives you the freedom to adapt to different devices. Use the included USB C cable with inline remote and microphone for calls and playback, or switch to an optional analog cable when needed.
Specifications
What's included
- One pair of HD 400U over-ear headphones
- One USBC cable with inline remote and microphone
- A quick guide to get you started
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