Overview

Audio Mijinco (オーディオみじんこ) is a small workshop in Akihabara, Tokyo, run by owner T. Arakawa. The catalog centers on handmade power and signal cables, the SILVER HARMONIZER “virtual ground” plugs (e.g., 3.5 mm, RCA/XLR), and small accessories such as silicone bands. The shop operates a BASE online store and a physical counter at SEEKBASE. International shipping is not available (Japan domestic only). [1][2][3]

Scientific Validity

For the core lineup (power cables, “virtual ground” plugs), we found no credible third-party measurements or blind tests demonstrating audible improvements versus properly specified standard cabling. Established engineering sources conclude that, in systems with competent power supplies, the last 1–2 m of mains cable does not improve THD+N, S/N, or frequency response; claims rely on misconceptions about noise pickup and grounding. Similarly, “grounding boxes/virtual ground” accessories lack controlled evidence of measurable, audibly relevant benefits. Representative technical discussions and measurements concur that any differences, if present, sit below audibility thresholds. [11][12][13][14]

Technology Level

The engineering approach emphasizes artisanal construction (e.g., DF-OFC conductors, custom housings, hand assembly/QBT treatment) rather than verifiable performance mechanisms. The SILVER HARMONIZER 3.5 ADVANCE (4N silver lead to sleeve/“float” structure) and OROCHI-series cable descriptions are implementation-focused but provide no measured performance deltas versus standard, safety-compliant cables. [2][4][9]

Cost-Performance

Company-level CP is computed as a weighted average in USD (weights reflect category prominence):

• Power cable (50%): OROCHI GR3 (1.8 m) 77,000円 ≈ 513 USD. Comparator: a standard safety-rated JIS/NEMA–IEC C13 cord (1.8–2.0 m) widely available at ≈ 10 USD class (e.g., Ainex 1.8 m is 1,360円 domestically; ≈ 9.1 USD).
  CP_1 = 9.1 ÷ 513 = 0.0177 → 0.0 after rounding. [4][6]

• “Virtual ground” plug (30%): SILVER HARMONIZER 3.5 ADVANCE 10,800円 ≈ 72 USD. Comparator: Vortex HiFi 3.5 mm Jack A.I.O. (similar interference-reduction claim), EUR 6.95 ≈ 7.6 USD.
  CP_2 = 7.6 ÷ 72 = 0.106. Both rely on manufacturer claims; no independent measurements. [2][8]

• Silicone band (20%): AUDIO MIJINKO® silicone band (2-pack) 1,000円 ≈ 6.7 USD. Comparator: mass-market silicone ties 2-pack at USD 2.99.
  CP_3 = 2.99 ÷ 6.7 = 0.448. [10][7]

Weighted average CP = 0.5×0.0177 + 0.3×0.106 + 0.2×0.448 ≈ 0.130 → 0.1 (1-decimal rounding). Result: materially poor price-to-function, especially for power cables.

Reliability & Support

Hand assembly and small-batch production can help individual QC, but formal metrics (RMA/MTBF) and warranty terms are undisclosed. Build/custom lead time is typically ~10 days for cables; shipping is domestic-Japan only. Overall support outlook is average for a boutique operation. [4][5][1]

Rationality of Design Philosophy

Persistently promoting ultra-high-priced cables and “virtual ground” accessories without controlled, audibly relevant measurements is highly irrational from a scientific standpoint. Authoritative engineering sources explicitly find no audible benefits from premium power cords and treat unmeasurable claims (e.g., “black background,” “soundstage depth” from cords/ground boxes) as non-scientific. The company’s design direction does not align with pathways that improve transparent-level metrics for hearing. [11][12][14]

Advice

If you value craftsmanship and aesthetics, purchase accordingly—but do not expect measured sonic gains. For audible improvements, allocate budget to components with published, independently verified performance. For compliant power cords or cable management, generic options offer equal practical function at a fraction of the price. [6][7]

(2025.8.16)

References

1. Audio Mijinco BASE store – Home/About/Shipping note (“We do not ship overseas”), accessed Aug 16, 2025. https://audiomijinko.thebase.in/
2. Audio Mijinco – SILVER HARMONIZER 3.5 ADVANCE product page, accessed Aug 16, 2025. https://audiomijinko.thebase.in/
3. Audio Mijinco BASE – SILVER HARMONIZER XLR price page (9,600円), accessed Aug 16, 2025. https://audiomijinko.thebase.in/items/22412787
4. Audio Mijinco BASE – Power Cables category (OROCHI GR3 77,000円; DEEP FOREST 59,800円), accessed Aug 16, 2025. https://audiomijinko.thebase.in/categories/1048803
5. Audio Mijinco official site – Power cable/Orochi series page (custom build, ~10-day lead time), accessed Aug 16, 2025. https://mijinko.jp/オーディオケーブル
6. Yodobashi – Ainex ACP-HC18B 1.8 m power cord price (1,360円), accessed Aug 16, 2025. https://www.yodobashi.com/category/19531/19533/19586/19909/
7. Harbor Freight – STOREHOUSE 12 in. Silicone Ties (2-Pack) price USD 2.99, accessed Aug 16, 2025. https://www.harborfreight.com/12-in-silicone-ties-2-pack-58036.html
8. Kemp Elektroniks – Vortex HiFi 3.5 mm Jack A.I.O. price EUR 6.95 (incl. VAT), accessed Aug 16, 2025. https://www.kempelektroniksshop.com/terminators-caps/
9. Audio Mijinco BASE – BLUE EYES II power cable page (DF-OFC, hand-built, lead-time note), accessed Aug 16, 2025. https://audiomijinko.thebase.in/items/83554607
10. Audio Mijinco BASE – All items list featuring AUDIO MIJINKO® Silicone Band (2-pack) 1,000円, accessed Aug 16, 2025. https://audiomijinko.thebase.in/items/all
11. Audioholics – “Audiophile Power Cords — Do they really make a difference?”, Apr 29, 2011 (engineering analysis of mains cord claims). https://www.audioholics.com/audio-video-cables/power-cables
12. Audioholics – “The Truth About Interconnects and Cables,” Nov 15, 2004 (measurement-based cable guidance). https://www.audioholics.com/audio-video-cables/the-truth-about-interconnects-and-cables
13. Archimago’s Musings – “Experiments in audio component grounding—using a bus bar,” Apr 27, 2019 (ground/loop noise measurement context). https://archimago.blogspot.com/2019/04/measurements-experiments-in-audio.html
14. Ethan Winer – “Audio Myths Workshop” (AES/educational talk on measurement & blind testing), video. https://www.youtube.com/watch?v=BYTlN6wjcvQ

(2025.8.16)