KEFINE Klean IEMs Review

KEFINE's Klean is a single dynamic driver IEM built around a 10mm driver whose diaphragm is made of DLC (Diamond-Like Carbon), with N52 neodymium magnets, a Daikoku CCAW voice coil and a dual-cavity structure, per the page. It is listed from $45 for the 3.5mm version without a microphone. The cable is high-purity silver-plated copper on detachable 0.78mm 2-pin connectors, and the page says swapping the nozzle filter changes between two sound profiles. The page text carries no specification list, so it gives no impedance, sensitivity or frequency range.

Specifications

Options and pricing

Two options are listed, both orderable when the page was read. Klean-3.5mm without Mic is $45 and Klean-Type C with Mic is $47, and the page shows a crossed-out $49 next to $45 and a crossed-out $51 next to $47. The text describes the stock cable with a 3.5mm single-ended termination plug and does not describe the Type C cable, its microphone or any DAC. It names silver and black tuning nozzles, and the page text lists no ear tips or other box contents.

How it compares

The KEFINE Klean SV 10mm Dynamic Driver In-Ear Earphone is listed from $52 against $45 here, and its spec line names a new-generation 10mm DLC diaphragm, so the two share a maker and a diaphragm material. The JUZEAR POISE Series Nimbus Warm-Balanced Single Dynamic Driver IEMs start at $54.99, and the Moondrop Marigold 10mm Dynamic Driver USB-C IEMs are $39.99. The Klean suits a buyer who wants a DLC diaphragm and swappable nozzles from $45.

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.