E1DA 9039S USB-C DAC/Amp Review

E1DA's 9039S is a USB-C DAC and headphone amplifier that HiFiGO lists at $139 in a single 2.5mm option. The page names the ES9039Q2M chip, and its specification section gives a balanced 2.5mm output with A&K pinout, PCM up to 32b/384kHz and DSD256 on the input, and 48x22x9mm at 10g. It runs from a USB 5V power rail with no internal battery, per the page.

Specifications

Options and pricing

One option is listed, named 9039S-2.5mm, at $139, and it was orderable when the page was read. The option name matches the balanced 2.5mm jack in the specification section. The page text gives no in-the-box list, so it does not say whether a cable or an adapter is included, and it gives no color choice.

How it compares

The E1DA 9038D6K USB Headphone Amp 3.5mm Jack Unbalanced Output DAC+HPA is $135 and its name gives a 3.5mm unbalanced output, while the 9039S at $139 lists only a balanced 2.5mm jack. The TANCHJIM Space Pro Dual CS43198 Portable USB DAC/AMP starts at $145.20 and its spec line names dual CS43198 DAC chips with dual ES8262 amp chips, where the 9039S page names ES9039Q2M, AD8397 and OPA1612 chipsets. Choose the 9039S if your headphones use a balanced 2.5mm plug; choose the 9038D6K if you plug in with 3.5mm.

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.