The ultimate EQ solution for your product

Eilex PRISM® is an extremely precise, highly efficient EQ solution that can get your product sounding its best in minutes. Eilex PRISM’s measurement process can be done in minutes by a single person without a specialized setup.

Eilex PRISM Composer software makes the tuning process fast and intuitive, with real-time results and an easy-to-use GUI.

  • Acoustic Power Volume Density (APVD) Frequency Response: Eilex PRISM uniquely measures and equalizes APVD frequency response, which is the most accurate mathematical representation of sound as heard by the human ear.
  • Time and Phase Alignment Correction: PRISM automatically corrects time and phase alignment errors, particularly in the low-frequency range, enhancing the sound’s fidelity and clarity.
  • VIR Filter® Technology: The system uses a Variable-resolution Impulse Response (VIR) filter for equalization, superior to traditional FIR filters, especially at low frequencies. The VIR filter requires less computational resources and provides consistent resolution across the entire audio spectrum.
  • Automated Measurement Process: PRISM’s measurement is automated, utilizing a single microphone and the PRISM Composer software. The software analyzes data from an unlimited number of points in 16,384 frequency bands to build an equalization curve.
  • Versatile Applications: Eilex PRISM can be used to equalize anything that makes sound, making it suitable for everything: high-end audio, TVs, portable audio devices, wireless earbuds, car audio, and even subwoofers.
  • Flexibility and Time Efficiency for Designers: Eilex PRISM offers flexibility to product designers. Whatever the speaker layout or acoustic properties of a product, Eilex PRISM can handle equalization.
  • Application on Microphones: Besides speakers, PRISM can correct irregular frequency responses in microphones, especially MEMS microphones.

An audio filter for the 21st Century

Eilex PRISM utilizes a VIR Filter, a revolutionary new audio filter that surpasses the limitations of FIR and IIR filters.

  • Far less computing power needed for the same filter resolution

  • Unequaled filter resolution in the bass range

  • Minimum-phase filter

  • Intelligent resource allocation — extremely flexible

  • High resolution support without reducing resolution

Minimum phase

A minimum phase filter is a specific type of audio filter that has the shortest possible group delay for its given magnitude response. In other words, it is designed to introduce the least amount of delay or phase distortion while still achieving the desired frequency response.

Minimum phase filters are important in audio processing because they help preserve the temporal relationships between different frequencies, reducing audible artifacts. They are often used in equalizers, crossovers, and other audio processing applications where maintaining signal integrity is crucial.

In a filter, the phase response represents how each frequency component of the input signal is delayed or advanced in time when passing through the filter. A minimum phase filter has a phase response that is directly related to its magnitude response, which means that the phase distortion is minimized while still achieving the desired changes in frequency response. This is important because it helps maintain the integrity of the original signal by preserving the temporal relationships between different frequencies.

What is APVD?

Acoustic Power Volume Density (APVD) is a way to measure the distribution of sound energy coming from a speaker. When a sound is produced by a speaker, it travels through the air in all directions, similar to the ripples in water after you drop a stone into it. These sound waves carry acoustic energy, which is what we perceive as sound when it reaches our ears.

APVD is calculated by measuring the sound pressure at many points in front of a speaker, covering the entire angle from which the sound is emitted. The measurement takes into account the variations in sound pressure caused by interference between the different sound sources within the speaker system, such as multiple drivers. APVD measurement provides the most complete understanding of the overall distribution of sound energy, so it is the most important aspect of sound to correct.

Available on All Major Chip Brands

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