The Elysia xfilter is a high‑end analog 4‑band stereo equalizer designed for professional mastering and critical mix‑bus applications. With its Class‑A, 100% discrete signal path and true stereo link, the xfilter delivers transparent, precise tone shaping without phase‑related artifacts between channels, making it ideal for mastering studio chains and mix‑bus equalization.
 
The EQ features four bands: high and low shelf filters, resonant high and lowpass filters, and two fully parametric mids with switchable Q. This architecture allows surgical control over the entire frequency spectrum, from subtle low‑end tightening to airy high‑range adjustment. The high and low bands can be switched from shelves to resonant highpass and lowpass filters, giving you powerful tools for structuring the overall sound and cleaning out unnecessary energy. The additional passive high band adds a smooth, non‑invasive high‑frequency lift without coloration.
 
All four bands are linked across both channels, ensuring perfect stereo image coherence, while the 41‑step potentiometers provide repeatable, stable recall of settings. The unit covers an extended frequency range (<10 Hz–400 kHz) and offers high headroom (+21 dBu), low noise (‑98 dBu) and a dynamic range of 120 dB, making it suitable for even the most demanding mastering tasks. The xfilter’s design emphasizes openness, punch and clarity, with a balanced output stage that preserves transient detail.
 
For mastering engineers, mix engineers and producers seeking a transparent, analog 4‑band stereo EQ with Class‑A topology, true stereo link and resonant filtering options, the Elysia xfilter is a powerful centerpiece in any professional analog signal chain.