24 Units Balanced Armature Combination In-Ear Earphones IEM

    24 Units Top-Level Configuration
    Streamlined Surface Made of Zinc Alloy
    Comfortable To Wear & Noise Reduction
    4 Strands of 200-Core Silver-Plated Cable
    Detachable 2pin 0.75 Cable
Color :
Product Price
$130.00 USD $108.80 USD
$110.50 USD
Terms & conditions

Free standard shipping to most countries

Free express shipping on orders over $270*. 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

Shipping may be delayed due to covid-19 depending on your country regulations.
Free Shipping

Authenthic Products

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

Free Shipping

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*.

24 Units Top-Level Configuration

AST adopts the 2nd generation High-frequency matrix BA combination designed and developed independently. The combination of 12 balanced armature units on one side and detailed acoustic adjustment significantly improves high-frequency performance, makes the human voice rich, soft, and not harsh, and the sound smooth and natural, bring a professional listening experience.

Streamlined Surface Made of Zinc Alloy

AST owns the precision of the ear shell ±0.03 which reaches the highest rigorous quality standard. The zinc alloy material is polished by five-axis CNC and polished by professional craftsmen, making the surface cover a streamlined curved surface and full of sense of technology.

Comfortable To Wear & Noise Reduction

With a smaller size and ergonomic design, AST is suitable for diversified wearing scenarios. The contour curve of the earphone conforms to the shape of the human ear cochlea, which can also greatly isolate the noise. It is matched with a soft silicone earplug and ear-hook design, which can be worn for a long time.

4 Strands of 200-Core Silver-Plated Cable

AST owns 4 strands of 200-core silver-plated professional earphone cable, retaining the sound of subtle changes, which is the symbol of every audiophile. The 0.75mm gold-plated pin insert and pull structure independently developed expands more usage ways to meet individual needs through replacement and upgrading of cables.

Optional Colors &Mic

According to a survey of mainstream colors in the earphone market, AST chooses three color schemes that are sophisticated in-depth to meet the needs of different groups of people. You can choose the mic version if you need it. Enjoy HiFi music as well as not missing any phone calls.

New upgrade of the new generation of BA

-First Upgrade:
The new 30017s balanced armature combination make a rapid increase in medium and high frequency
-Second Upgrade:
New type 30095s and 30019s balanced armature unit
The high frequency is instantaneously improved, showing rich details.
-Third Upgrade:
Deep optimization of the middle frequency of the new 29689s balanced armature unit
-Fourth Upgrade:
The low-frequency energy of the new 22955s balanced armature unit is equivalent to three ordinary balanced armature

Product Type
Unit combination
-50024s High frequency matrix BA

-30019s high frequency BA

-29689s medium frequency BA

-22955slow frequency BA

-30095shigh frequency BA

-30017s medium and high frequency BA combination

-3-Channel leading tone tube

-Electronic crossover

Plug type
Pin Type
Line Length

Coming soon...


Coming soon...

Customer Reviews

Based on 10 reviews
albert teixidor ferrer
Sound good, the cable it's awful

There are big, but confort, the cable it's awful, after a month needs to be touch or I lost the stereo sound.

What a letdown

I bought these after losing my KZ ZSXs, reading reviews that the sound quality is among the best if not the best of all KZ IEMs.
But to my suprise they sound terrible, there are virtually no highs, they sound super muffled. Only boosting highs by about 12 dB made them sound okay. My 4 year old 25€ Bluetooth headphones or the ZSX sound much better than this.
The cable and the IEMs themselves seem to have a good build quality, though, so there is two stars.

David Kuzmich

Great Sound! With some EQ and some Power!

Not worthy compared to KZ ZEX

Physically it looks more costly but could not delivery the quality it claims, especially compared to ~$20 KZ ZEX. Requested Linsoul to return but was asked to pay 35% restocking fee. Interesting and disappointed about such customer experience in 2022. Not sure whether other people feel comfortable about such return policy. Not buy anything from this website any more.

Hello there. Thank you for the review.

With regards to our Return and Warranty Policy, that information has been stated under our 'terms-and-conditions', which all customers have to read and acknowledge before making any purchase on our website.

Don't know 😕 who to blame

They sent me the first generation, the BA are all silver on the inside what's up with that linsoul?,I'll upload a picture 📸 later.

Rene Riou


Bass head iem

Bass is killer. Best I've heard to date. Imagine they have even more impact then my Sony MDRs. Wish I'd bought a few more sets when the sale was on, the wait is on for next sale event.

Naythaniel Williams
Surprisingly awesome

I didn't expect these to be so versatile musically. But basically everything sounds good in these. There's not much more one could ask for if one is using headphones to enjoy music and not to nitpick the headphones.

Barak Nitzan
Good stuff

Sounds great. Would love longer tips.

Nevin Morrison
Redemption by KZ after the disastrous ASX

In simple terms this is the best KZ I've every listened to and this is indeed the model that might have redeemed kz from their disastrous ASX launch. It has really good tuning with the right amount of bass and mids while keeping the treble under control. It is surprising to think that an all BA set-up can sound pretty much natural in the lows like a dynamic driver. I'd give them props for correcting their mistake and giving stress on good tuning along with plopping more drivers. that combo often doesn't work out well but in this case however it strikes a good balance.

Our Shipping Process

If 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.

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 $269 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 $270 include free express shipping (DHL or similar). If your order total is under $270 you can manually add Express Shipping at the checkout page for $15.00 - $35.00USD

World-Wide Shipping

Shipping FAQ

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 the two-way freight charges. 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 refund will 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?
  1. 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.
  2. 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.

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 ( 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 for after-sale services. The following details are required.
1) Send an email to with an appropriate Subject Title 
2) Provide your order number and state the issue clearly
3) 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.

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

Last updated: 1 November 2022

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