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• Product Overview – Harmonix SYN 100 Spikes and RF909x Spike Base, released in the mid-2000s, are vibration control accessories designed to optimize mechanical grounding, resonance dissipation, and tonal balance in high-end audio systems.
• Tuning Philosophy – Developed using Harmonix’s tuning-based approach, the combination controls energy flow rather than fully isolating components, preserving musicality, timing accuracy, and natural harmonic structure.
• System Enhancement – Harmonix SYN 100 Spikes and RF909x Spike Base improve focus, bass articulation, and soundstage stability when used under loudspeakers, racks, or electronics, especially in revealing high-resolution systems.
• Specifications – Precision-machined metal spikes with matched base interfaces, resonance-tuned materials, point-contact energy transfer, and compatibility with most speaker and rack threaded inserts for universal audiophile applications.
• Dimensions – Individual spike height is approximately 25 mm, with RF909x bases measuring roughly 50 mm in diameter, allowing discreet placement while maintaining effective mechanical coupling.
• Weight – Each spike and base set weighs approximately 150–200 g, providing sufficient mass for stability while supporting controlled resonance behavior and consistent component grounding.
At S$1,800, this like-new listing sits comfortably between the median (S$1,462) and the 75th percentile (S$2,246) of 91 recent SGD comparables, marking it as a fair price for a premium Harmonix spike system in pristine condition. It’s not a bargain by the database numbers, but it’s neither ambitious; you’re paying for a clean, original-owner set of a well-regarded isolation component without the usual used-market wear.
Harmonix’s SYN 100 spikes paired with RF909x bases are respected for tightening speaker bass and reducing cabinet resonance through precise mechanical decoupling. The RF909x MK2 variant (often sold as 4-piece sets) is known for robust machining and consistent performance, and getting a like-new set with no mention of missing parts or pad wear is a genuine upside. For enthusiasts upgrading speaker stands or seeking tighter low-end control, this is a solid buying opportunity at a fair market rate.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Harmonix is not a recognized brand in the hi-fi or consumer-audio sector. Extensive searches yield no verifiable information on a company by that name producing amplifiers, speakers, turntables, DACs, headphones, cables, or related equipment. The closest matches are unrelated entities: Electro-Harmonix, an American effects pedal maker founded in 1968 by Mike Matthews, focused on guitar fuzz, phasers, and delays like the Big Muff Pi; and Harmonix Music Systems, a Boston-based game studio from 1995 known for Rock Band and rhythm games, acquired by Epic Games in 2021.
Without confirmed details on origin, products, or market position for a hi-fi Harmonix, any description would rely on speculation, which cannot be provided. Knowledgeable buyers should note that obscure or boutique hi-fi brands often require direct verification from manufacturer sites or industry directories, as generic searches frequently confuse them with guitar effects or gaming firms.
If this refers to a specific Japanese cable or accessory maker sometimes called Harmonix (e.g., Harmonix Reimyo), details remain unconfirmed in available sources, positioning it as niche rather than established hi-fi. For accurate intel, consult specialist audiophile forums or retailers.
See all Harmonix listings on RADAR.
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