TFZ STA-Pro Series IEMs Review

TFZ's STA-Pro series puts a 10mm and a 6mm dynamic driver in each earpiece, and the page covers three models, STA-Pro, STA-Pro Ultra and STA-Pro Max, from $39.90. It says the main difference between them is the diaphragm material, while the spec section also gives each its own impedance and sensitivity. All three are quoted at 10~30kHz. The page calls the series a Year of the Snake Limited Edition, with a snake on the face covers, and gives the codename Silver Angel.

Specifications

Options and pricing

Three options are listed, all orderable when the page was read: STA-Pro at $39.90, STA-Pro Ultra at $49.90 and STA-Pro Max at $79.90. They are separate models rather than colors. Per the spec section, the STA-Pro uses composite diaphragms and 22Ω, the Ultra a graphene 10mm diaphragm and 18Ω, and the Max an LCP 10mm diaphragm and 30Ω. The page says the face covers come in different color combinations without naming them, and the page text does not state a plug type.

How it compares

The ROSESELSA Aurora Ultra 1DD + 1 Planar Driver IEMs are $40.99 and name one dynamic and one planar driver, where the STA-Pro names two dynamic drivers and starts at $39.90. The KEFINE Klean 10mm DLC Diaphragm Dynamic Driver IEM starts at $45; its spec line calls it a single dynamic driver IEM. The Moondrop Marigold 10mm Dynamic Driver USB-C IEMs are $39.99 and carry USB-C in the name. The STA-Pro suits buyers who want two dynamic drivers per side and a choice of three diaphragm materials; the Marigold suits a buyer who wants a USB-C connection.

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.