About Harmonic Harmony
Hailing from Asia’s audiophile scene, Harmonic Harmony has built a reputation as a leader in ultra-high-end car audio cabling. The brand crafts some of the finest OCC copper cables and power-line accessories, all engineered for true-to-life sound and a “silent” noise floor. Harmonic Harmony positions itself at the pinnacle of quality through meticulous material science – using pure copper, advanced insulation, and even graphene-enhanced noise filters – to preserve every musical detail.
This competition-proven ethos (developed alongside partner brand Crescendo over 20 years) means Harmonic Harmony cables are trusted by sound quality champions. From audiophile RCA interconnects to innovative grounding modules, the brand serves those who demand no-compromise signal purity – ideal for SQ competitors, hi-fi installers, and any enthusiast seeking to hear music exactly as recorded.
History & Milestones
Early 00's
The Beginning
Andreas Tjahjadi opens a Jakarta car-audio business (1995) and expands into distribution (1999).
The early 2000's saw Harmonic Harmony's establishment in Indonesia (alongside Crescendo Car Audio), with a focus on ultra-high-end signal and power delivery products for serious sound quality builds. From the beginning, the brand positioned itself as a specialist in OCC copper cables and signal integrity, developed for competition-level systems.
Early contest activity begins (2003), followed by the launch of in-house brands under PT Audio Plus Indonesia in 2004.
2013-2018
Asian Competition Dominance
Harmonic Harmony cables and power accessories began appearing in EMMA Asia championship builds, contributing to multiple Master and Skilled class titles. During this period, Crescendo/Harmonic Harmony systems earned the prestigious EMMA Asia “King of Sound” title, elevating the brand’s international credibility.
2019
EMMA Global Recognition
The Harmonic Harmony Concerto Series RCA interconnects received formal recognition at EMMA Europe 2019, winning a Best Performance award — cementing the brand’s status as a serious high-end signal solution within global competition circuits.
2020-2023
Premium Product Range Expansion
The brand introduced advanced power delivery solutions, grounding modules, and EHD noise filters, and launched key series including:
• Direct Link Series (OCC copper signal cables)
• Octave Series (enhanced shielding & noise rejection)
• Concerto Series (flagship competition-level RCA line)
Recognition at EMMA Singapore 2023: Harmonic Harmony’s ANL fuse system received a “Best of the Year”, reinforcing the brand’s engineering excellence in Singapore.
2024
20th Anniversary Milestone
Harmonic Harmony and Crescendo celebrated over 20 years of technical collaboration, reinforcing their shared philosophy of “True Audio Quality” and continued presence in international competition builds.
Today
Present Day – High-End Signal Specialist
Harmonic Harmony continues to be led by founder Andreas Tjahjadi, whose passion for uncompromising sound quality remains the driving force behind the brand. Backed by over two decades of hands-on competition experience and international recognition, Harmonic Harmony is not chasing trends — it is refining signal integrity at the highest level.
With ongoing development in advanced conductor materials, noise-floor reduction technology, and next-generation grounding solutions, the brand is focused on pushing the limits of what in-car resolution can achieve.
Award-Winning Car Audio
Cables & Powerline Technology
"Harmonic Harmony interconnects are designed to protect signal integrity between components. With high-purity copper conductors, low-capacitance geometry, and dense shielding, they minimize noise, resist interference, and ensure stable signal transfer in the electrically harsh automotive environment"
— Craig Harrison (Founder of OSCA)
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