OE Audio Angled 2pin and MMCX Adapter Review
An angled adapter between CIEM 2pin and MMCX connections, listed at $29.99 in Black or Clear. The page text gives a total length of 10.22mm, a PU body and 3U-Gold Plated Phosphor Copper connectors. It suits buyers who already know which connection direction they need.
Our verdict
A fit for a buyer who has worked out which MMCX and 2pin direction they need and wants an angled adapter with a stated 10.22mm total length and named materials. Look elsewhere if you need a stated 2pin spacing, a 3.5mm connection (the store title names it but no option does), or a smallest-size claim backed by a comparison. The main caveat is that the page's sound wording is a claim, and the page text gives no measurement for it.
- Best for
- Buyers who want an angled MMCX to 2pin or 2pin to MMCX adapter in Black or Clear at $29.99.
- Skip if
- You need a stated 2pin spacing or a 3.5mm connection, which none of the options offer.
Why 3.3/5: Held back by no specification list as text, by short page text with pictures that were not read for this review, by the store's own terms contradicting each other, and by no independent test of this model having been checked.
This angled adapter from OE Audio is listed at $29.99 in four options, MMCX to 2pin or 2pin to MMCX, each in Black or Clear. The page text gives a total length of 10.22mm, a PU body made by the PU Injection Method, connectors of 3U-Gold Plated Phosphor Copper and Mondolf Supreme Solder at the joints.
Specifications
| Spec | Page says |
|---|---|
| Total length | 10.22mm |
| Body | PU, made by the PU Injection Method |
| Connectors | 3U-Gold Plated Phosphor Copper |
| Solder | Mondolf Supreme Solder |
| Connection options | MMCX to 2pin Angled; 2pin to MMCX Angled |
| Colors | Black; Clear |
Options and pricing
Four options are listed, all at $29.99 and all orderable when the page was read: MMCX to 2pin Angled and 2pin to MMCX Angled, each in Black or Clear. The page text does not explain the difference between the two connection options and gives no pin spacing for the 2pin end, so the choice needs checking against your own earphone or cable.
How it compares
The OE Audio CIEM 2Pin 0.78mm to MMCX /MMCX to 2Pin 0.78mm Earphone Adapter costs $24.99 against $29.99 here; its name states a 0.78mm 2Pin end, which this page's text does not, and its spec line lists a 3U-Gold-Plated connector. This page offers Black or Clear and names its adapter Angled. If a stated 2Pin size matters, the 0.78mm listing gives one.
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.
Cables and adapters get three months of warranty from the order date, against one year for DACs, amps and IEMs; a note on the same page also excludes cables from returns for hygiene reasons, while the FAQ says a cable can come back in its original condition. HiFiGO decides between repair and replacement and the buyer pays the shipping. Claims go to [email protected], the only contact the store lists: its pages name no company, street address or phone.
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.
What we liked
- The page text gives a total length of 10.22mm
- The page text names its materials: a PU body, 3U-Gold Plated Phosphor Copper connectors and Mondolf Supreme Solder
- Two connection directions and two colors are offered at one price, $29.99
- All four options were orderable when the page was read
Worth noting
- The page text gives no pin spacing for the 2pin end and names no earphone or cable it is made for
- The store title names 3.5mm, but the options and the page text cover only MMCX and 2pin
- The page text does not explain how MMCX to 2pin differs from 2pin to MMCX
- The page's pictures were not read for this review, so anything shown only there is missing here
Questions before you buy
Which connections does this adapter offer?
Four options are listed, all at $29.99: MMCX to 2pin Angled and 2pin to MMCX Angled, each in Black or Clear. The store title also names 3.5mm, but no option or text line covers a 3.5mm connection.
What is it made of?
The page text gives a PU body made by the PU Injection Method, connectors of 3U-Gold Plated Phosphor Copper and Mondolf Supreme Solder at the joints, with a total length of 10.22mm.
Does the page claim a sound benefit?
Yes. The page text says the 3U-Gold Plated Phosphor Copper connectors, together with the Mondolf Supreme Solder, bring the adapter its sound performance, and it calls the adapter the smallest in the world. It gives no comparison with other adapters for the size claim and no measurement for the sound claim.
Where does HiFiGO ship from, and how long does it take?
From its warehouse in China, usually 1-3 business days after the order. The shipping policy gives 1-2 weeks to the US by Priority (6-10 days by Premium), both with duties and taxes prepaid, 2-3 weeks to Canada, 1-2 weeks to the UK and 10-15 days to Australia. Express couriers take 3-7 days, but the buyer pays any duties.
Can I send it back if I change my mind?
HiFiGO gives 7 days to report an item that arrives dead, damaged or wrong. Its policy also describes 30-day returns, but requests 7 to 30 days after delivery lose 30% of the MSRP plus shipping both ways and duties, and the FAQ on the same page says no refund or exchange after 7 days. Ask [email protected] before you open the box.
What warranty does HiFiGO give on cables?
Three months from the order date for cables and adapters, against one year for DACs, amps and IEMs. HiFiGO chooses repair or replacement and the buyer pays the shipping. Claims go to [email protected].
Sources & verification
What this review is based on and the day we last read it. Specs and claims from the maker are the maker’s own; the verdict and the rating are ours.
From the store
- OE Audio CIEM 2pin/MMCX/3.5mm Angled Audio Adapter product page: specs, options and price (the buy buttons go there)Specs, options and the listed priceRead October 28, 2026
- HiFiGO shipping policyShips from China in 1-3 business days; US 1-2 weeks by Priority or 6-10 days by Premium, duties prepaid; Express buyers pay dutiesRead October 28, 2026
- HiFiGO shipping and order tracking pageA second shipping text: Premium also for Canada and Australia, Canada free shipping from $99.99, lost-parcel rulesRead October 28, 2026
- HiFiGO refund policy7-day dead-on-arrival cover; 30-day returns minus a 30% restocking fee; its FAQ says no refund after 7 daysRead October 28, 2026
- HiFiGO warranty and refund policyWarranty by product class (1 year; cables and adapters 3 months); 30% fee for resealing an opened productRead October 28, 2026
- HiFiGO terms of serviceOperator named only as HiFiGo; governed by the laws of China; contact [email protected]Read October 28, 2026
Independent
- HiFiGO reviews on Trustpilot4.6 of 5 from 378 reviews (91% five-star, 5% one-star); the store has not invited reviews recentlyRead October 28, 2026
What we couldn’t verify
- The store title names 3.5mm, but the four options and the page text cover only MMCX and 2pin connections, and the page text gives no pin spacing for the 2pin end.
- The page text calls this the smallest adapter in the world at a total length of 10.22mm and says its connectors and solder bring a sound benefit; it gives no comparison with other adapters for the size claim and no measurement for the sound claim.
- The page's pictures were not read for this review, so anything shown only in them is not covered here.
- HiFiGO's policy pages contradict each other: 30-day returns with a 30% restocking fee in one place, no refund or exchange after 7 days in the FAQ.
- HiFiGO's pages name no company, street address or phone number; the only contact given is [email protected].
- HiFiGO's warranty page excludes cables from returns for hygiene reasons, while its FAQ says a cable can come back in its original condition.
Spotted an error or something out of date? Tell us and we’ll fix it and update the date.
OE Audio CIEM 2Pin and MMCX Adapter — read reviewOE Audio CIEM 2Pin and MMCX Adapter
An earphone adapter from OE Audio listed at $24.99 in six Black or Clear options (2Pin to MMCX, MMCX to 2Pin and 3.5mm versions); two were sold out when read. The spec section gives a PU body and a 3U-Gold-Plated connector. It suits buyers joining CIEM 2Pin or MMCX connections.
OE Audio 2DualOFC Earphone Cable — read reviewOE Audio 2DualOFC Earphone Cable
A 1.2m/4ft earphone cable from OE Audio at $57.99, with a spec section giving ≤8PPM Purity Nexans Oxygen Free Copper, 4 Cords (2 Cores x 2 Cords) and Teflon insulation. It suits buyers who want MMCX with a 3.5mm or 2.5mm plug; the 0.78mm 2pin options were sold out when read.
TOPPING TCR2 RCA Cable — read reviewTOPPING TCR2 RCA Cable
A TOPPING RCA cable listed in 10CM, 25CM, 75CM and 125CM options, each named as one pair, from $39. The page text describes a soft X-9 wire for 10CM and gives SGP-222 wire figures under a >10CM heading. It suits buyers who want RCA leads in a set length.