THIEAUDIO Legacy 4
1DD + 3BA Hybrid In Ear Monitor
- The proprietary 8mm poly-membrane dynamic driver
- Knowles TM and THIEAUDIO Customized Balanced Armatures
- 3-Way Crossover Network is integrated into a 2-switch tuning system
- Paired with an OCC 4-core custom cable
- Optional Upgrade EST cable is 2.5mm balanced cable comes with 3.5mm and 4.4mm adapter
- Hand-crafted, tested for Quality Assurance
Free standard shipping to most countries
Free express shipping on orders over $200*. Enjoy free tax and duty paid to most countries. Please refer to our shipping FAQ to see if you apply.
Covid-19 Shipping Delay Notice

Authenthic Products
Linsoul Audio is the authorized distributor. All products are authentic and genuine.

Worldwide Free Shipping
We are located in China but send our products worldwide for free. T&Cs apply.

1 Year Warranty
We provide 1 year warranty for the all products except the cables*.
THIEAUDIO
Thieaudio was launched in 2019 as a creative endeavor of Linsoul Audio. The goal of Thieaudio was to serve as a creative platform for gathering the best teams of engineers to inspire revolutionary audio products for audiophiles and professionals alike. For each project, we hand select the most innovative and renowned engineers in his or her field to oversee the design, engineering, and manufacturing of the products. Gathering the momentum from the success of the Thieaudio Phantom planar magnetic headphones, as well as the Voyager, Legacy, and Signature series In-Ear Monitors (IEMโs), we are committed to the continual expansion on the limits of high-fidelity audio. We welcome you to join us and experience excellence in musical performance.
Legacy Series
The Legacy series capitalizes on Thieaudioโs proprietary Nano-Membrane Dynamic Driver to create a high-performance hybrid in-ear monitor. Geared towards the discerning audiophile and music enthusiast, the Legacy series re-envisions the qualities that make up high-fidelity audio to present a unique combination of enjoyable tuning that also excels in technical performance. With each model of our Legacy Series, we hope to reveal a refreshing new perspective on your daily listening experience, immersing you deeper into the music.ย
Legacy 4
The Legacy 4 was designed concurrently with the Legacy 5 to provide a unique twist to the lineup. With the beloved budget model, the Legacy 3, and the natural and smooth sound signature of the Legacy 5 in mind, we wanted the Legacy 4 to be a middle ground - both in terms of the tuning and price. Utilizing a completely new in-house 8mm poly-membrane dynamic driver for the low end, the Legacy 4 provides the impactful slam of the Legacy 3 and 5, but with a faster speed and enhanced texture. This new driver, matched with the tried and tested American Knowles ED29689 balanced armature (BA) and intuitive low-mid passive crossover design emphasizes a natural mid-frequency presentation. With a less aggressive crossover design than the Legacy 5, the mids of the Legacy 4 presents a more musical experience that ever so slightly adds a dash of warmth to the overall signature. With the partnership of Bellsing, we have developed a custom dual BA tweeter for the Legacy 4 that perfectly fits the mid BA driver. From the relaxed and smooth treble delivery of the Legacy 5, we have tuned the Legacy 4 to bring more upper treble presence, highlighting upper frequency overtones and details. This tuning and the extremely capable treble extension of our new tweeters brings an even greater level of airiness and shimmer to the mix, making the Legacy 4 an excellent IEM for both professional musicians and music enthusiasts alike. You can trust that the Legacy 4 will provide one of the most natural, accurate, and enjoyable musical experiences among any IEMโs of its class.ย
Tuning Switch
The Legacy 4 crossover network is integrated into a 2-switch tuning system that allows the user to define the level of bass and mids. This tuning system means you can find the perfect sound signature no matter your musical preference!
A Completely Redesigned Look
Our team has worked hard to completely update our look! Paired with an OCC 4-core custom cable, youโll find the Legacy 4 in an all new beautiful storage and travel case.ย
Hand Crafted, Test for Quality Assurance
Each Legacy 4 unit is hand crafted, from the medical-grade German resin, to the internal circuitry, all the way to the painting of the faceplate. You can rest assured that your Legacy 4 is both a one of a kind in design and in line with all of our quality check protocols. Every pair is individually tested for left-right channel matching and inspected for defects prior to packaging and shipment. At Thieaudio, quality always comes first.
PRODUCT SPECIFICATIONS
WHAT'S IN THE BOX
Coming soon...
UNBOXINGS
Coming soon...
Our Shipping Process

NEW ORDER
AutomaticIf everything goes right our system will automatically generate your order and send you a confirmation email. If you don't receive the confirmation email please double-check that it wasn't automatically stored in your spam or promotions folder.

ORDER PROCESSING
3 Working Days*Most of the items you see are in stock and ready to be shipped after 3 working days. If you plan to order a custom (Design or Fit) product, a pre-order, or a made to order item processing times may change on item to item basis.

Standard Shipping
15 to 30 Days.Standard shipping is offered free worldwide for orders under $199 USD (with some exceptions), but please consider that delivery times may vary considerably depending on your country, up to 90 Days.

Express Shipping
3-6 Working Days.Most items over $200 include free express shipping (DHL or similar). If your order total is under $200 you can manually add Express Shipping at the checkout page for $15.00 - $35.00USD
Shipping FAQ's
Which countries do you ship to?
We are generally able to ship to most countries via DHL Express, and many countries via Standard Shipping. You may clarify with our team to see whether Standard Shipping is available to your country.
*Note: We can only do Standard Shipping for the UK, India and Russia. We can only do Express Shipping to Africa, Argentina, Hawaii, Kuwait, Mauritius, Montenegro and Sri Lanka, to name a few.
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 via DHL Express is 10-35USD depending on your country. If your order is over 200USD, DHL Express Shipping is free*.
*For some countries, DHL Express is only free for orders above $239USD. Large items such as headphones (e.g. HarmonicDyne Zeus, Gold Planar GL2000, and etc.) are exceptions as well.
Shipping fees exclude import taxes or processing fees that might be applicable for your country. Linsoul is not responsible for any form of such fees.
How long does it take to process my order after it is placed?
For in-stock products, your order will be shipped within 3 working days.ย You may check with our staff regarding the in-stock status of any products.ย
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 2-3 weeks for items to be delivered after shipping out. For some countries, it might take up to 2-3 months, depending on your country and its customs. The duration for transit is something beyond our control. Linsoul will not be making refunds for such cases. Please consider an upgrade to DHL Express 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 โno-signature deliveryโ
- 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 my 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 shipping cost incurred.
How do I get help for my order?
For faulty/missing items, please send an email to support@linsoul.com to process warranty. In your email, please choose an appropriate Subject Title. Kindly include your Order Number, and state your issue clearly. Please also attach photographs/videos as โproofโ, if any. 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
How do I order Custom In-ear Monitors (CIEMs) on Linsoul?
Please kindly check the following guide first: CIEM Ordering Guide
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.
What shipping companies do you use?
We collaborate with these courier companies:
Standard Shipping: 4PX, UBI, NinjaVan, and Yun Express
Express Shipping: DHL Express and SF Express