HiBy Crystal 4 In-Ear Monitors Review
A 4-driver IEM from HiBy that the page calls an all-Knowles design with a 2-way crossover, listed at $299.99. The cable ends in a 3.5mm single-ended plug and the earpieces use 0.78mm 2-pin sockets; the listing text gives no impedance or sensitivity.
Our verdict
A 4-driver Knowles IEM for someone who wants listed driver models, a 2-way crossover and 0.78mm 2-pin sockets at $299.99. Look elsewhere if you need other plug options or a listed impedance and sensitivity, since the listing text gives neither. The main caveat is that the page's tuning, HiRes and comfort statements are the maker's claims and were not checked here.
- Best for
- Someone who wants an all-Knowles IEM with listed driver models and a swappable 0.78mm 2-pin cable.
- Skip if
- You need other plug options or listed impedance and sensitivity figures.
The page calls HiBy's Crystal 4 an all-Knowles design with 4 drivers and a 2-way crossover: a Knowles 22955 low frequency driver, a 29689 midrange driver and dual 31736 high and ultrahigh frequency drivers. The driver type beyond the Knowles name is not given. It is listed at $299.99 as one option, with a silver-plated copper cable ending in a 3.5mm single-ended plug.
Options and pricing
The page shows one orderable option at $299.99. The cable is described as high purity silver-plated copper with a standard 3.5mm single-ended termination, and the earpieces use industry standard 0.78mm 2-pin sockets, so another cable can be fitted. The listing text shows no other plug option and gives no cable length.
How it compares
The Shanling ME600 is $299 and its listing text mentions Hybrid, while the Crystal 4 page names only Knowles drivers. The ZiiGaat x B_Media: Jade is $299 with Quadbrid, planar and MEMS mentioned, and the XENNS Mangird Tea PRO is $305.15.
Shipping
- Methods and costs. The store's shipping page offers Standard Shipping (4PX, Yanwen or Yun Express), free for most countries, and Express Shipping (DHL Express, FedEx or SF Express) at 15-50 USD depending on the country, free for orders over 270 USD in most countries (checked 2026-11-11).
- Delivery times. It says an in-stock order ships within 3 working days, Standard takes about 2 weeks after shipping out (up to 1-3 months for some countries, and the store makes no refund for that transit time) and Express takes about 3-7 days. Festive seasons and other circumstances can change the timing.
- Taxes and fees. The buyer pays any customs, import or processing fees. The page says Standard via YunExpress is tax-inclusive for some countries, that remote areas can carry extra Express charges, and that a parcel refused or left uncollected over taxes is deducted two-way freight and may be destroyed with no refund.
- Where it ships. The page says the store can generally ship to most countries by Express and many by Standard, and to confirm Standard with the team for your country. It cannot ship to PO boxes or APO/FPO addresses and can only use Express to Hawaii. It does not name the US, Canada, the UK, Australia or New Zealand, so confirm before you pay.
- Lost parcels. If a parcel has been in transit for at least 3 months, the page offers a one-time reshipment or a full refund for orders under $50 and a 50% refund for orders above $50.
Returns and warranty
- Returns. The return page allows returning any non-customized product that is still factory sealed within 30 days of receiving it, with the buyer paying the shipping. Email [email protected] within that period; the store asks for the return to be shipped within 5 working days of the RMA instructions and in most cases processes a refund within 5 business days of inspecting it (checked 2026-11-11).
- Opened items. A product opened within the first 7 days after delivery can be returned for the price minus a restocking fee of 35% of its retail value, including when it still works properly.
- Refund or credit. The buyer can choose a refund to the original payment method (PayPal or card) or store credit; with no answer within 48 hours of confirmation the default is store credit, which can also be prioritized during promotions, final-sale events and for items 40% or more off retail.
- Not returnable. Customized products, including faceplate designs, are non-refundable, and the page says the same applies to carry cases, cables, ear tips and other accessories, "due to hygiene purposes". If one item in a package is defective, incorrect or missing, the refund or replacement covers only that item.
- Warranty. The page gives a 1-year warranty on products, excluding carry cases, ear tips and other accessories, and 3 months on cables and adapters, from the date of purchase. It covers factory defects that affect proper function, not damage from human error, negligence, accidents, dismantling, water, abuse or modification (checked 2026-11-11).
- Not covered or limited. It does not apply to items bought elsewhere (AliExpress, Amazon, local dealers and the like), prize or giveaway items, normal wear or colour change, commercial use, or items that were stolen or went missing. Coverage is limited for products 40% or more off retail, for review units and for items repaired or modified by anyone Linsoul has not authorized.
- Claims. Email [email protected] with the order number, the issue and photos and videos of the fault. The store may ask for the unit back for a replacement. It covers shipping for some defects reported within 7 days of delivery if the fault can be shown on video or photo; after 7 days the buyer ships it back. For wrong or missing items an unboxing video of the whole sealed parcel is required.
Before you buy
Linsoul says it was founded in 2016 by the Crazy HiFi team to bring Chinese HiFi makers closer to listeners worldwide, and that it now sells other makers' products alongside four brands of its own, THIEAUDIO, Kiwi Ears, ZiiGaat and Tripowin (checked 2026-11-11).
We have not read any independent review of this product or of the store. Ratings and owner reviews shown on the store's own pages are the store's and were not verified.
What we liked
- The page lists the driver models: Knowles 22955, 29689 and dual 31736, with a 2-way crossover
- 0.78mm 2-pin sockets are named, so the cable can be changed, per the page
- The standard cable's plug is named as 3.5mm single-ended
- One option at $299.99, so there is no choice to sort out
Worth noting
- The page names Knowles drivers but not their type, and the listing text gives no impedance, sensitivity or frequency response
- No cable length is listed
- The only plug named is the 3.5mm single-ended one on the standard cable
Questions before you buy
What drivers does the Crystal 4 list?
The page lists an all-Knowles configuration of 4 drivers with a 2-way crossover: a Knowles 22955 low frequency driver, a 29689 midrange driver and dual 31736 high and ultrahigh frequency drivers. It does not name the driver type.
What cable and plug does it have?
The page describes a high purity silver-plated copper cable with a standard 3.5mm single-ended termination and 0.78mm 2-pin cable sockets. The listing text gives no cable length.
What does the page say about the HiRes logo?
The page says the Crystal 4 is certified by the Japan Audio Society, which bestowed the HiRes logo. That is the maker's claim and was not checked here.
Can I return it if I change my mind?
The return page allows returning a non-customized product that is still factory sealed within 30 days of receiving it, with the buyer paying shipping. An opened product returned within 7 days carries a 35% restocking fee. Refunds go to the original payment method or to store credit, which is the default if you do not choose.
How long does shipping take?
The shipping page says in-stock orders ship within 3 working days. Standard Shipping takes about 2 weeks after shipping out, up to 1-3 months for some countries, and Express takes about 3-7 days. Standard is free for most countries; Express costs 15-50 USD and is free over 270 USD (over $499.99 for large items such as headphones and desktop DAC/AMPs).
Does Linsoul ship to the US, Canada, the UK, Australia and New Zealand?
The page says Linsoul can generally ship to most countries by Express and many by Standard, and to ask the team about Standard for your country. It names no restriction for the US, Canada, the UK, Australia or New Zealand, but it does not list them either, and it can only use Express to Hawaii.
What warranty does it have?
The page gives a 1-year warranty on products from the purchase date for factory defects, not for human error, accidents or modification. Coverage is limited for items 40% or more off retail and for review units, and it does not apply to items bought from other sellers.
Sources & verification
What this review is based on and the day we last read it. Specs and claims from the maker are the maker’s own; the verdict and the rating are ours.
From the store
- HiBy Crystal 4 product page: specs, options and price (the buy buttons go there)Specs, options and the listed priceRead November 11, 2026
- Linsoul shipping pageStandard and Express shipping, costs and times, import taxes, lost parcels, couriers, trackingRead November 11, 2026
- Linsoul return policy and warranty page30-day returns of sealed items, 35% restocking fee on opened ones, 1-year and 3-month warranties, exclusions, how to claimRead November 11, 2026
- Linsoul support FAQThe same shipping, return and warranty rules in question form, plus order changes and cancellationsRead November 11, 2026
- About LinsoulFounded in 2016 by the Crazy HiFi team; names its own brands; the awards listed there are the store's own accountRead November 11, 2026
What we couldn’t verify
- The page's tuning, balance and comfort descriptions, and its Japan Audio Society HiRes certification, are the maker's claims and were not checked here.
- The page names Knowles drivers by model number only; the listing text does not say whether they are balanced armature or another type.
- The listing text gives no impedance, sensitivity, frequency response or cable length.
- We have not read an independent review of this product or the store, and the store's own ratings were not verified. We read the store's catalog description only: a specification table or image shown just on the live page was not read.
- The shipping page names no US, Canada, UK, Australia or New Zealand times or fees: its figures are general and we could not confirm them for these countries.
Spotted an error or something out of date? Tell us and we’ll fix it and update the date.
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