Effect Audio CODE 23 MK II Cable Review
An Effect Audio Horizon Series cable that the page says is built entirely from UP-OCC Pure Copper Litz, from $551.65. The options pair a ConX Basic Set (MMCX+2Pin 0.78) with a Term Basic Set (2.5+3.5+4.4) or a Pentaconn OFC 4.4, so it suits buyers who want to choose the termination.
Our verdict
A fit for buyers who want a cable the page says is built entirely from UP-OCC Pure Copper Litz, from $551.65, with a choice of two terminations. Look elsewhere if you need a stated AWG figure, length or specification list, or figures checked by someone other than the store. The main caveat is that the page's sound and improvement claims come with no measurements in the page text.
- Best for
- Buyers who want a cable the page labels pure copper litz, with a choice between a Term Basic Set and Pentaconn OFC 4.4.
- Skip if
- You need a stated AWG, cable length or specification list, which the page text does not give.
Why 3.4/5: Held back by a page with no specification list as text, by the store's own terms contradicting each other, and by figures from the store alone, since no independent test of this model was checked for this review.
The CODE 23 MK II is an Effect Audio cable that the page calls the Horizon Series statement of copper, listed from $551.65. The page says the cable is built entirely from UP-OCC Pure Copper Litz and uses a Quad-FlexPro Solid Core System with four solid cores. The page text names over 20% more conductive material and a 10% reduction in overall diameter as MK II improvements, and gives no AWG figure, length or specification list.
Specifications
| Spec | Page says |
|---|---|
| Conductor | Built entirely from UP-OCC Pure Copper Litz |
| Solid core | Quad-FlexPro Solid Core System, four individually calibrated solid cores |
| Strand count | Increased by 20% for the MK II (page claim) |
| Diameter | 10% reduction in overall diameter (page claim) |
| Y-split | Lightweight aluminium, soft metallic gold finish |
| Series | Horizon Series |
| 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 |
Options and pricing
Two options are listed, both naming the ConX Basic Set (MMCX+2Pin 0.78). With the Term Basic Set (2.5+3.5+4.4) the price is $551.65, and the page shows a crossed-out price of $649 next to it. With Pentaconn OFC 4.4 the price is $656.10, crossed-out $729. Both were orderable when the page was read, and the page text does not describe what the Term Basic Set holds beyond its name.
How it compares
The Effect Audio CODE 24 Series MK II / MK 2 Earphone Cables start at $721.65 and their spec line reads 16.5AWG 2 Wires, an AWG figure this page text does not give. The Effect Audio Signature Series II DIONYSUS 8 Wires Earphone Cables start at $429 with 26 AWG 8 Wires, and the Moondrop Silver Pill Oxygen-Free Copper Silver-Plated Earphone Upgrade Cable is $599.99. The CODE 23 MK II suits a buyer who wants a conductor the page names as pure copper litz; the Dionysus suits a smaller budget.
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 names the conductor as UP-OCC Pure Copper Litz, built entirely from it
- Two ways to pair the ConX Basic Set (MMCX+2Pin 0.78) with a termination: Term Basic Set (2.5+3.5+4.4) or Pentaconn OFC 4.4
- The page text describes a Quad-FlexPro Solid Core System with four solid cores
- Both options were orderable when the page was read, at $551.65 and $656.10
Worth noting
- The page text has no specification list and gives no AWG figure or cable length
- The page text does not say what the Term Basic Set holds beyond its name
- The page gives 'over 20%' and '20%' for the added conductive material, with no figures for the earlier version in the page text
- Sound claims (subwoofer-like impact, a deep and commanding low end) are the page's wording only
Questions before you buy
What conductor does the CODE 23 MK II use?
The page says it is built entirely from UP-OCC Pure Copper Litz and has a Quad-FlexPro Solid Core System with four solid cores. The page text gives no AWG figure.
Which connectors and terminations are offered?
Both options name a ConX Basic Set (MMCX+2Pin 0.78). The termination is either a Term Basic Set (2.5+3.5+4.4) at $551.65 or Pentaconn OFC 4.4 at $656.10.
What changed in the MK II?
The page lists over 20% more conductive material (a strand count raised by 20%), a 10% reduction in overall diameter and the Quad-FlexPro Solid Core System. The page text gives no figures for the earlier version.
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 23 MK II / MK 2 Earphone Cables 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 page's sound claims (immense bass power, subwoofer-like impact, tighter bass definition, lower distortion, phase alignment) are its own wording, with no measurement in the page text.
- The page says 'over 20% more conductive material' in one place and 20% elsewhere, and its text gives no figures for the earlier version; the 10% diameter reduction has no stated baseline either.
- The page text gives no AWG figure, cable length or specification list; it says only that the cable keeps the same AWG size.
- 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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