KEFINE Klean SV IEMs Review

The Klean SV is KEFINE's Silver Version of the Klean, per the page: a 10mm DLC (Diamond-Like Carbon) diaphragm dynamic driver in a metallic alloy shell, listed from $52 for the 3.5mm cable. The spec section gives 32Ω ±15% impedance, 107dB±3dB sensitivity, 20Hz~20kHz and 10g each side, with 0.78mm 2-pin connectors. The page describes three tuning nozzles, silver, gold and black, and a silver-plated copper cable of 108 wires in total.

Specifications

Options and pricing

Three options are listed, all orderable when the page was read: Klean SV 3.5mm at $52, Klean SV 4.4mm at $54 and Klean SV TypeC at $54. The page shows a crossed-out price of $54 next to $52, with crossed-out $56 prices on the 4.4mm and TypeC options. The spec section names 3.5mm, 4.4mm and Type-C terminations on a 0.78mm 2-pin connector, and the page calls the 4.4mm cable balanced. It says the SV is packed with accessories but its text lists none, so ear tips and box contents are not given.

How it compares

The KEFINE Klean 10mm DLC Diaphragm Dynamic Driver IEM is listed from $45 against $52 here, with a spec line naming a single dynamic driver. The JUZEAR POISE Series Nimbus Warm-Balanced Single Dynamic Driver IEMs start at $54.99 and their spec line names a self-developed 10mm MACCD driver, and the Moondrop LAN II / LAN 2 10mm Dynamic Driver IEMs are $59.99 with a glass dome composite diaphragm in the spec line. The Klean SV suits a buyer who wants three nozzle options and a 4.4mm balanced cable choice.

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.