Interphase Audio Iridium 500 Series Equalizer (Demo Deal)

The Interphase Audio Iridium is a 500 Series 4-band inductive equalizer. The name Iridium is derived "Iris," the Greek goddess of the rainbow - and that is exactly what you’ll get with this unit! A silky smooth rainbow of EQ. Dial in any frequency, and be amazed.

Inductor based circuits are considered the "holy grail" of equalizer designs. These were used for example in the much renowned Pultec equalizer design dating back to the late 1950s. Owing to their unique electro-mechanical properties, inductors impart a character all of their own, which is very distinctive.

The Iridium uses 16 inductors spread out over the four bands, with custom-wound Carnhill inductors in the low-mid and low bands, giving precise control and the inductor sound on each band. Iridium features a a Class A, discrete design with all components carefully chosen and matched to provide an extremely musical sound. You’ll get a very distinctive sound, which most sound engineers love.

As a consequence of using inductors, this provides a “peaking” or “bell” characteristic, giving tight control of the frequency selected. Each band provides switch selection of any of 6 carefully selected frequencies chosen at musically pleasing intervals. Each band allows very fine control of up to 15dB cut or boost per band.

Though the circuit in the Iridium is based on a vintage design, it is decidedly modern with updated techniques and components that were simply not available 60 years ago. This is definitely not a clone or copy!

TECHNICAL DETAILS:

• Input impedance: 30 kOhms
• Common mode rejection: 80 dB
• Distortion: 0.001% (+4 dBu output 1 kHz)
• Frequency response: 7 Hz to 70 kHz (-3 dB)
• Boost/Cut range: ±15 dB (continuously variable)
• HF Frequency: 8, 9, 10, 12, 14, 16 kHz (stepped)
• HMF Frequency: 1.5, 3, 5 6, 7, 8 kHz (stepped)
• LMF Frequency: 125, 250, 500, 1k, 2k, 4 kHz (stepped)
• LF Frequency: 50, 80, 100, 150, 300, 600 Hz (stepped)
• Filter Q: 1.2 (just over 1 octave)
• Maximum input level: +28 dBu
• Maximum output level: +28 dBu (10k load)
• Nominal input and output level: +4 dBu (electronically balanced)
• Output impedance: 100 Ohms
• Noise floor (typical, unweighted, EQ on): -80 dBu
• Noise floor (unweighted, EQ off): -100 dBu
• Current requirement: 81 mA (maximum) per rail