Solar Harmonic-Fibonacci Upgrade Set

Regular price $105.00

Expanded ratios. Subtle variation.

The Solar Harmonic–Fibonacci Upgrade Set is designed to extend an existing Solar Harmonic Spectrum into a different range of tonal relationships.

With the addition of these four forks, the spectrum begins to shift—from familiar intervals into more nuanced and less predictable interactions.

A Complex and Evolving Voice

These forks introduce ratios based on the Fibonacci sequence.

The result is a field of sound that feels less linear, and more fluid. When combined with other forks in the system, the tones create subtle variations—small shifts in spacing, gentle pulsing, and changing relationships between frequencies.

About the Fibonacci Sequence

The Fibonacci tuning system is based on a sequence of numbers that appears widely in nature—found in patterns such as shells, plants, and spirals.

Each fork in the series is defined by a ratio derived from the Fibonacci sequence (1/1, 1/2, 2/3, 3/5, 5/8, 8/13, 13/21, 21/34), creating relationships that move in a spiral-like progression rather than a linear scale.

When these forks are sounded together—often using the 1/1 fork as a reference—they produce subtle, evolving intervals that can feel fluid, layered, and exploratory. The resulting sound field is less fixed and more dynamic, inviting a different quality of listening.

In practice, the Fibonacci system offers a way to work with sound as a continuous unfolding pattern, supporting curiosity, perception, and the exploration of how tones interact across shifting relationships.

Use in Practice

This set is intended for those already working with the Solar Harmonic Spectrum.

In practice, it may support:

  • expanding into more subtle and varied tonal relationships
  • exploring micro-intervals and shifting resonance patterns
  • introducing contrast within an otherwise stable harmonic field
  • deepening sensitivity to how tones interact over time

You may begin with a familiar pair, then introduce one of these forks and notice how the field changes.

Additional Details
Size: approximately 7 inches
Weight: approximately 3 oz per fork
Material: High-grade aluminum alloy
Made in the USA

Shipping & Care

At Sunreed™, we take great care in preparing each instrument before it leaves our shop. Many of the instruments we offer are handmade or individually selected, and each one is carefully inspected, listened to, and packed so it arrives safely and ready for practice.

Products typically ship the next business day with FedEx or USPS and should arrive within 3 to 7 business days within the US. International shipments may take up to 4 weeks.

Note: for large shipments to Alaska, Hawaii, and international destinations additional freight charges may apply; we will contact you within one business day if additional shipping is required.

⟶ See our shipping policy for more details.

Returns & Exchanges

At Sunreed™, we stand behind the quality of our instruments and the care of your experience. However, if something about your order does not feel right, please reach out within 30 days of your order date. We are here to support you, both in your instrument and your practice.

⟶ View our refund policy for further information.

The Sunreed™ Difference

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We stand behind the quality of our instruments and the care of your experience

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