EUIU UI-09
High-Fidelity Wired In-Ear Stage Monitor
ForStudio monitoring/Critical listening/Travel & commute
Recommended products
Complete your setup. Choose your options and add without leaving this page.
Optional pairings. A cable and ear tips are already in the box.
Overview
The details behind EUIU UI-09.
Hybrid 1 DD + 8 BA Architecture with 3-Way Crossover
The EUiU UI-09 is a high-fidelity wired in-ear stage monitor featuring a hybrid architecture of 1 dynamic driver and 8 balanced armature drivers, totaling 9 drivers with a 3-way crossover. This configuration delivers a full-band, differentiated tuning that balances powerful deep bass, lush midrange, and airy highs. Designed for stage monitoring, professional listening, and daily commuting, the UI-09 reproduces the pure original sound with exceptional dynamic performance and precise detail, ensuring an immersive and fatigue-free listening experience.
Self-Developed 10mm Dynamic Driver with PU+LCP Diaphragm
At the heart of the UI-09 is a self-developed 10mm high-dynamic low-frequency dynamic driver. It uses an imported PU+LCP composite diaphragm, which combines the rigidity of LCP and the flexible damping of PU. This suppresses breakup vibration and reduces harmonic distortion, accurately restoring energy layers and spatial ambience within the low-frequency range. The result is powerful, deep bass with exceptional dynamic performance, providing a solid foundation for the entire frequency spectrum and delivering a natural, engaging low-end response.
Custom 4 Mid + 4 High Balanced Armature Drivers
The UI-09 incorporates 4 custom mid-range balanced armature drivers and 4 custom treble balanced armature drivers. These drivers feature a proprietary magnetic and armature structure, delivering lush midrange and airy highs. A high-precision RC electronic filter network finely segments the high, mid, and low frequency bands, while independent acoustic tubes for each band prevent acoustic interference between drivers. This ensures a cohesive, detailed sound with accurate separation and a natural tonal balance across all frequencies.
Micron-Level 3D-Printed Housing & Pure-Physical Faceplate
Deeply co-developed by EUiU and HEYGEARS, the UI-09 features a micron-level high-precision 3D-printed housing. Integrated printing of acoustic tubes and driver slots eliminates assembly tolerances, ensuring consistent performance. Made of skin-friendly resin, the lightweight housing contours snugly to the auricle, distributing wearing pressure for long-lasting comfort. The faceplate reinvents the language of light through pure physical micro-nano structures, using diffraction and interference to create an immersive naked-eye 3D light-and-shadow effect without a single drop of chemical pigment.
6N Silver-Plated Single Crystal Copper Cables
The UI-09 comes with two high-quality cables. The 3.5mm single-ended stock cable is constructed with 6N silver-plated single crystal copper and silver foil composite conductors, featuring 4-strand cross precision braiding and a soft, skin-friendly jacket that effectively suppresses microphonics. The 4.4mm balanced cable uses 6N silver-plated single crystal copper with an 8-strand cross braided structure, reducing signal transmission loss and delivering an expansive soundstage with clean, transparent resolution. Both cables unlock the earphone's native audiophile sound potential.
Specifications, Packaging & Customization
The UI-09 offers a sensitivity of 109dB SPL at 1kHz, an impedance of 18 Ohm, and a frequency range of 20Hz to 20KHz. It features a 0.78mm 2-pin cable interface and supports both 3.5mm and 4.4mm plugs. The package includes the UI-09 earphones, both cables, silicone eartips in various sizes, a silicone tip storage case, and a portable leather storage case. EUiU also offers standard color customization through a selection of colors, patterns, and faceplate materials from the provided swatches.
Technical details
- Drivers
- 1DD+8BA
- Driver configuration
- Hybrid
- Driver technology
- Dynamic Driver, Balanced Armature
- Cable connector
- 0.78 mm 2-pin
- Included plugs
- 3.5 mm, 4.4 mm
- Product Name
- EUiU UI-09 High-Fidelity Wired In-Ear Stage Monitor
- Model
- UI-09
- Crossover
- 3-way with RC electronic filter network
- Dynamic Driver
- 10mm self-developed, PU+LCP composite diaphragm
- Balanced Armature
- Custom 4 mid + 4 high
- Sensitivity
- 109dB SPL @ 1kHz (179mVrms)
- Impedance
- 18 Ohm @ 1kHz
- Frequency Range
- 20Hz – 20KHz
- Cable Interface
- 0.78mm 2-pin
- Plug Type
- 3.5mm single-ended / 4.4mm balanced
- Cable Material
- 6N silver-plated single crystal copper + silver foil (3.5mm); 6N silver-plated single crystal copper (4.4mm)
- Housing
- Micron-level 3D-printed skin-friendly resin
- Faceplate
- Pure-physical micro-nano light-effect panel
Shop with Linsoul
Your order
Which countries do you ship to?
We are generally able to ship to most countries via Express Shipping, and many countries via Standard Shipping. You may clarify this with our team to check whether Standard Shipping is available to your country.
We cannot ship to addresses that are "PO boxes or APO/FPO".
*Note: Generally, we can only do Selected Shipping to India and Russia. We can only do Express Shipping to Africa, Argentina, Hawaii, Kuwait, Mauritius, Montenegro and Sri Lanka, to name a few.
This may be subjected to changes due to unpredictable issues such as Covid, war, and etc.
How much does shipping cost?
We have two shipping methods - Standard Shipping and Express Shipping.
Standard Shipping is free for most countries, while Express Shipping is 15-35USD depending on your country. If your order is over 270USD, Express Shipping is free*.
*This applies for most countries. However, large items such as headphones and desktop DAC/AMPs (e.g. HarmonicDyne G200, MUSICIAN MDP-2, and etc.) are excluded.
Shipping fees exclude import taxes or processing fees that may be applicable for your country. Linsoul is not responsible for such fees. Should you refuse to pay the tax/customs fees, shipping fees will still be deducted from the amount paid for thetwo-way freightcharges. The cost of the freight charges may be more than the amount reflected on your order due to tax and other miscellaneous fees.
Some parcels claimed to be “returned to the seller” may be destroyed by the post office or customs officers when buyers refuse to accept their parcels or fail to pay for their taxes.No refundwill be processed for such cases.Standard Shipping via YunExpress is a tax-inclusive option for some countries. However, Linsoul will not be responsible for additional administrative or handling fees charged by your local courier company or customs. Please kindly check this with your local customs.For certain remote areas, there may be additional charges via Express Shipping. We will contact you if there is a need to make additional payments. Please contact us before placing an order, should you have any queries regarding shipping.
How long does it take to receive the order after it is placed?
For in-stock products, your order will be shipped within 3 working days. You may check with our staff regarding the in-stock status of any products.
Customized items will take a longer time. Please contact our staff for more information.
On normal non-sale days, once your parcel has been shipped out:
- For Standard Shipping, it takes about 2-4 weeks for items to be delivered after shipping out. For some countries, it might take up to 2-3 months, depending on your country, its customs and other factors.* The duration for transit is something beyond our control. Linsoul will not be making refunds for such cases. Please consider an upgrade to Express Shipping or keep the waiting time in mind.
- For Express Shipping, it takes about 3-7 days for items to be delivered after shipping out.
*Note: Timings might be affected due to festive seasons or other unforeseen circumstances
What happens if the parcel has been shipped but not delivered?
First, kindly contact your local courier using the local tracking number.
If your parcel were to be in transit for at least 3 months, it may have been lost in transit.
For orders below $50USD, you may either opt for a one-time reshipment of parcel OR a full refund of the amount paid in cash via PayPal/Credit/Debit card.
For orders above $50USD, we will only process a 50% refund of your order paid in cash via PayPal/Credit/Debit card. Should there be any concern about Standard Shipping, you are encouraged to opt for DHL Express Shipping instead.
Customers are to bear the consequences and fees incurred, if the parcel was undelivered due to any of the following situation:
- Wrong address or phone number provided by recipient
- Recipient was uncontactable when courier company contacted
- Refusal to sign for the package by recipient
- Lost or damaged parcel because recipient opted for “no-signature delivery”
- Refusal to pay for the local tax/processing fee by recipient
- Refusal to provide supporting documents for custom clearance by recipient
Who will pay for the import tax/custom fees
Customers have to bear any form of custom/import/processing fees that are applicable for your parcel.
Should you be unwilling to pay for the fees and reject the delivery of the parcel, you will still have to pay for the shipping cost. Linsoul will only refund the amount of your order after deducting the two-way shipping fees incurred.
What shipping companies do you use?
We collaborate with these courier companies:
- Standard Shipping: 4PX, UBI, NinjaVan, and Yun Express
- Express Shipping: DHL Express, FedEx and SF Express
How do I get help for my order?
Cancellation or/and modification of orders can only be done manually via our staff, provided that our Warehouse Team has not processed your order.
As our Support Team might not be available during non-working days and weekends, please place your order wisely.
Should you really need to cancel or/and modify your order after purchase, please contact us via our support email (Support@Linsoul.com) or website chat. We will help you with the changes if that could be done.
In general, upon receiving your parcel, please confirm the contents of the package and ensure that the package is in good condition before signing for it. All customers are strongly advised to take an unboxing video of their parcel and packaging when opening their parcels and products.
For faulty/missing items, please send an email to support@Linsoul.com for after-sale services. The following details are required.
- Send an email to support@Linsoul.com with an appropriate Subject Title
- Provide your order number and state the issue clearly
- Attach photos and videos to show that your product is faulty/missing. Shipping details on the parcel packaging have to be clearly visible.
If the photos/videos provided are insufficient to prove the stated issue, we will enquire more. Once the issue has been confirmed, we will arrange for a replacement, partial refund or a full refund (where applicable). For incorrect products, Linsoul reserves all rights in deciding whether you need to return the incorrect item or not. Please kindly contact us via email first. Our team aims to review your email within 3 working days.
For other queries, the fastest way to contact us is via our website or Discord
Linsoul Audio will not be responsible for parcels that have been damaged during the transit process.
Do I get tracking details for my order?
After placing an order, you will receive the order confirmation email. After your order has been shipped out, you will also receive a tracking email. You can track your order via the tracking number online. Should you not have received the emails or face any difficulties tracking your order, please kindly contact us for support.
For more than 1 orders placed under the same account and shipping address, Linsoul will automatically combine the orders and ship them out via one tracking number. Should you have special requests to have the orders shipped separately, please kindly contact us via Discord or our website's chat. We will do our best to help.
How do I cancel my order?
Cancellation or/and modification of orders can only be done manually via our staff, provided that our Warehouse Team has not processed your order. Orders that have been shipped cannot be cancelled and modified.
As our Support Team may not be available during non-working days and weekends, please place your order wisely as support cannot be guaranteed for such requests.
Should you really need to cancel or/and modify your order after purchase, please contact us via our support email (support@Linsoul.com) or website chat. We will help you with the changes if that could be done.
Can I return an opened item?
Request a return within 30 days of delivery while the product is factory-sealed. Contact support for instructions before returning anything.
Where should I send the product for the return process?
To initiate the return shipment, kindly send an email to support@Linsoul.com within 30 days upon receiving the sealed product(s). The RMA form and details will be provided to you via email.
When must the product be returned after receiving the RMA form and details?
After receiving the return instructions from us via email, kindly arrange the return shipment of the parcel within 5 working days, and update us with the tracking link via email again. Failure to do so will result in a cancellation of the return process.
When will I receive my refund after returning the product?
In most cases, after receiving and inspecting the returned product, your refund will be processed within 5 business days. Refunds may incur a currency exchange loss or transaction fee, depending on your source of payment (e.g. Bank or PayPal). Linsoul will not be responsible for such fees.
What warranty applies?
Most products come with a 1-year warranty; cables and accessories have shorter or separate terms.
Recently Viewed Products
