Effect Audio CODE 24 MK II Cable Review
Listed from $721.65 with a crossed-out $849 shown on the page, the CODE 24 MK II is a Horizon Series cable from Effect Audio. The spec section gives 16.5AWG 2 Wires, Silver-Plated Copper Litz and 120cm ± 5cm; it suits buyers who want a stated length and a choice of termination.
Our verdict
A fit for buyers who want a cable the page labels silver-plated copper litz, with a stated 120cm ± 5cm length and a choice of two terminations, from $721.65. Look elsewhere if you want figures checked by someone other than the store or a page that says what each Basic Set contains. The main caveat is that the page's sound and MK II claims have no measurements behind them in the page text.
- Best for
- Buyers who want a cable the page labels Silver-Plated Copper Litz, with a stated 120cm ± 5cm length and a termination choice.
- Skip if
- You want the page to spell out what each Basic Set contains or to back its sound claims with measurements.
Why 3.5/5: Held back by store terms that contradict each other, and by no independent test of this model having been checked for this review, which leaves its AWG, length and core-bundle figures resting on the store's page.
From $721.65 on HiFiGO's page, the CODE 24 MK II is a Horizon Series cable from Effect Audio. Its spec section gives 16.5AWG 2 Wires, UP-OCC as the smelting process, Silver-Plated Copper Litz, 13 multi-sized core bundles and a length of 120cm ± 5cm, and it names a ConX and TermX Basic Set Interchangeable Connector/Plug System. The two options differ in the termination named: a Term Basic Set (2.5+3.5+4.4) or Pentaconn OFC 4.4.
Specifications
| Spec | Page says |
|---|---|
| Wire | 16.5AWG 2 Wires |
| Smelting process | UP-OCC |
| Material | Silver-Plated Copper Litz |
| Solid core | Quad-FlexPro SolidCore |
| Core bundles | 13 Multi-sized Core Bundle |
| Sleeve | EA UltraFlexi Insulation |
| Length | 120cm ± 5cm |
| Connection system | ConX and TermX Basic Set Interchangeable Connector/Plug System |
| Connector option | ConX Basic Set (MMCX+2Pin 0.78) |
| Termination options | Term Basic Set (2.5+3.5+4.4) or Pentaconn OFC 4.4 |
| Y-split | Lightweight aluminium, soft metallic gold finish |
Options and pricing
Two options are listed, each naming the ConX Basic Set (MMCX+2Pin 0.78). Paired with the Term Basic Set (2.5+3.5+4.4) the cable is $721.65, and the page shows a crossed-out price of $849 next to it. Paired with Pentaconn OFC 4.4 it is $789.65, crossed-out $929. The page marked both as orderable, and its text does not say what each Basic Set contains beyond the name.
How it compares
The Effect Audio CODE 23 MK II / MK 2 Earphone Cables share the MK II name and start at $551.65. The Effect Audio Fusion Series Fusion1 / Fusion 1 2025 Earphone Cables start at $1,019.15 with a spec line of 21AWG 2 Wires, against 16.5AWG 2 Wires here. The Moondrop Silver Pill Oxygen-Free Copper Silver-Plated Earphone Upgrade Cable is $599.99. The CODE 24 MK II suits a buyer who wants a stated 120cm ± 5cm length; the CODE 23 MK II and the Moondrop suit smaller budgets.
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 spec section gives 16.5AWG 2 Wires, 13 multi-sized core bundles and a length of 120cm ± 5cm
- Termination options are priced at $721.65 (Term Basic Set, 2.5+3.5+4.4) and $789.65 (Pentaconn OFC 4.4)
- The spec section names a ConX and TermX Basic Set Interchangeable Connector/Plug System
- The spec section labels the material Silver-Plated Copper Litz and lists UP-OCC as the smelting process and a Quad-FlexPro SolidCore
Worth noting
- The page gives 'over 20%' in one place and 20% in others for the added conductive material, with no figures for the earlier version in the page text
- The page text does not list what each Basic Set contains beyond its name
- Sound claims (lightning-fast transients, super-tweeter precision, smooth highs) are the page's wording only
- The 16.5AWG, 13-bundle and 120cm figures all come from the store's page, and no independent test of the CODE 24 MK II was checked for this review
Questions before you buy
What wire gauge and length does the page give?
The spec section gives 16.5AWG 2 Wires, 13 Multi-sized Core Bundle and a length of 120cm ± 5cm, with UP-OCC as the smelting process and EA UltraFlexi Insulation as the sleeve.
Which terminations are named in the options?
The options name a Term Basic Set (2.5+3.5+4.4) at $721.65 or Pentaconn OFC 4.4 at $789.65, each with the ConX Basic Set (MMCX+2Pin 0.78).
What does the MK II change, according to the page?
The page lists over 20% more conductive material, a 10% reduction in overall diameter and a Quad-FlexPro Solid Core system with four solid cores. The page text gives no figures for the predecessors it compares against.
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
- Effect Audio CODE 24 Series MK II / MK 2 Earphone Cables product page: specs, options and priceSpecs, 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 page's sound claims (lightning-fast transients, super-tweeter precision, smooth highs, open mids) are its own wording; the page text gives no measurement.
- The page says 'over 20% more conductive material' in its summary and 20% in the section that follows, and its text gives no figures for the earlier version; the 10% diameter reduction has no stated baseline.
- 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.
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