Cayin YB04 4BA IEMs Review

Cayin's YB04 is listed at $499 with four balanced armature drivers on each side, which the page describes as two Knowles and two Sonion units, in CNC-machined aluminium alloy shells. The specification section gives 30 Ohms, 113dB and 18Hz-40kHz, and the cable ends in a 3.5mm termination plug. The page's package list adds a carry case, a cable clip and a cleaning brush.

Specifications

Options and pricing

One option, Default Title, is listed at $499 and was orderable when the page was read. The page's package list names the earpieces, a 0.78mm two-pin hybrid cable with a 3.5mm termination, a carry case, three pairs each of Bass, Vocal and Balanced tips, one pair of Bi-Flange tips, a cable clip and a cleaning brush. The page text names no other plug size and describes a matt black finish.

How it compares

The Hidizs MS5 4BA+1DD Hybrid 5 Units HiFi In-Ear Monitor Earphone is also $499 and lists 4BA+1DD drivers, against four balanced armatures per side here. The Softears EDGE 11mm Dynamic Driver In-Ear Earphone is $499 with an 11mm labyrinth-structured dynamic driver. The QoA Margarita 2 Sonions EST + 1BA + 7mm DD In Ear Earphone is $494.10 with a 7mm custom titanium-coated dynamic driver. The YB04 suits buyers who want an all-armature layout; the MS5 suits those who want a dynamic driver added; the EDGE suits those who want an 11mm dynamic driver.

Shipping, returns and warranty

HiFiGO sells from hifigo.com and says every order leaves its warehouse in China, usually 1-3 business days after it is placed, and says its delivery times are estimates, not promises. Its shipping policy gives the United States 1-2 weeks (about 10 days on average) by Priority and 6-10 days by Premium, both with duties and taxes prepaid by the store; Canada 2-3 weeks; the United Kingdom 1-2 weeks; and Australia 10-15 days. Express couriers (DHL, UPS, FedEx) take 3-7 days, but then the buyer pays any duties and taxes. No shipping page names New Zealand, PO boxes are not accepted, and the free-shipping thresholds differ between the store's own pages, so check the cart. One of its two shipping pages adds that a lost parcel on an order above $50 gets only a 50% refund. A US buyer reported a $40 tariff charge in August 2025, after which HiFiGO said it had added a customs notice at checkout.

Read the return terms before you order. The homepage advertises 7-day returns. Both of HiFiGO's policy pages offer a 7-day dead-on-arrival cover (a replacement or a full refund, with the return postage refunded) and also describe 30-day returns, but a request made 7 to 30 days after delivery loses 30% of the MSRP as a restocking fee (10% more if the packaging is incomplete), plus shipping both ways and duties, and the FAQ on the same pages says there is no refund or exchange once 7 days have passed. One version recommends reselling an opened product locally. Custom IEMs and custom cables cannot be returned, no return address is published, and buyers describe sending items back to China.

HiFiGO's warranty runs one year from the order date for parts and labor; its policy names desktop DACs and amps, IEMs and dongles at one year and gives cables and adapters three months. HiFiGO decides between repair and replacement, the buyer pays the shipping, and faulty items go back for service, not for a refund. Claims go to [email protected], the only contact the store lists: its pages name no company, street address or phone, and its terms are governed by the laws of China.

On Trustpilot, HiFiGO had 4.6 out of 5 from 378 reviews when we checked on 2026-10-28 (91% five-star, 5% one-star), and it had replied to about 75% of negative reviews; Trustpilot notes the store has not invited customers to review recently. The one-star reviews mostly concern the short return window and the deductions on returns, items listed in stock that turned out back-ordered, slow email support and a tariff charge on a US delivery in 2025. HiFiGO says its products are genuine and come in the brands' retail packaging; it does not claim to be an authorized dealer.