The Interphase Audio is a 500 Series 4-band Hybrid Equaliser that seamlessly integrates capacitor-based EQ circuits and filters with inductor-based EQ circuits. Known as Helium, this unique equaliser combines the best elements of our Carbon and Iridium EQ, enhancing the design with additional filter circuits.

The Interphase Audio Helium stands out as a full Class-A, discrete design, where every component has been meticulously selected and matched to deliver an exceptionally musical sound. At Interphase Audio, we pride ourselves on creating original products, and Helium is no exception—not a mere "clone" or "copy" of existing designs. It boasts distinctive features and straightforward functionality, characteristic of all our audio solutions.

Designed with four bands featuring large overlapping frequency controls, Helium is well-suited for minimising problematic frequencies or providing an additional boost to others. The HF and LF bands offer flexibility, functioning as bell-curved EQ or -12 dB per octave hi-cut/lo-cut filters. The two middle bands showcase our inductive EQ, featuring custom-wound Carnhill inductors on the lo-mid band.

Each band on Helium allows for a generous cut or boost of up to 15dB, providing users with ample control over the audio spectrum. With its carefully crafted combination of capacitor and inductor-based circuits, Helium sets a high standard for audio equalisation, embodying Interphase Audio's commitment to unique design, exceptional sound quality, and user-friendly functionality.