Spectra 33 - Precision 1/3-Octave Spectrum Analyzer

Spectra 33 is a streamlined version of Spectra 99, designed for modern audio workflows and fully optimized for sample rates up to 96 kHz, delivering precise and stable spectral analysis in both standard and high-resolution sessions.

At its core is a 33-Band 1/3-Octave Frequency Layout, providing a natural and classic view of your mix.

"Fully coded DSP & GUI — optimized for CPU efficiency. No images, no SVGs, no skins. Pure signal."

CPU-Efficient Processing

The DSP and GUI are written entirely in code—free of heavy images, SVGs, or skins. By eliminating graphic overhead at the source, this lightweight architecture ensures stable, low-latency processing that remains highly CPU-efficient, even under heavy analysis or at high sample rates.

Key Features

• Engine: 33-Band 1/3-Octave Frequency Layout.

• Resolution: Adaptive 4096 / 8192-point FFT processing.

• Windowing: Hann window function.

• Tilt Modes: 0 dB, 3 dB, 4.5 dB reference slopes.

• Ballistics: 100 ms, 250 ms, 350 ms, and 500 ms decay modes.

• Precision: 32-bit floating-point processing.

• Metering: Dual-layer L/R peak and RMS meters (input background, output overlay).

• Stereo Tool: Correlation meter for width and phase monitoring.

• Formats: VST3.

• Sample Rates: 44.1–96 kHz support.

Version History

v1.1 – June 2026
• Optimised performance by refactoring spectrum component.
• Added a new color selection and improved meter panel performance.

v1.0 – Initial Release
• First public release of Spectra 33.