Interphase Audio Helium 500 Series Equalizer (Demo Deal)

The Interphase Audio Helium combines capacitor based EQ circuits and filters with inductor based EQ circuits in. single slot 500 Series module. Helium is essentially a combination of Interphase's Carbon and Iridium EQs, with extra filter circuits added. It features a fully Class A, discrete design with all components having been carefully chosen and matched to provide an extremely musical sound.

Helium's four bands have large overlapping frequency controls, making it well-suited for minimizing problematic frequencies, or giving an extra boost to others. The HF and LF band can be used as either bell-curved EQ or as -12 dB per octave hi—cut/lo-cut filter. The two middle bands feature inductive EQ, with custom-wound Carnhill inductors on the lo-mid band. Each band can be cut or boost with as much as 15 dB per band.

This is definitely not a clone or copy. Like all Interphase Audio products, Helium is unique and features great sound and straight forward functionality!

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: 1.2 kHz - 22 kHz (continuously variable)
• HF Frequency switchable to 12 dB per octave sweepable Hi-Cut filter 1.2 kHz - 22 kHz
• HMF Frequency: 1.5, 3, 5 6, 7, 8 kHz (stepped)
• LMF Frequency: 125, 250, 500, 1k, 2k, 4 kHz (stepped)
• LF Frequency: 25 Hz - 440 Hz (continuously variable)
• LF Frequency switchable to 12 dB per octave sweepable Lo-Cut filter 25 Hz - 440 Hz
• Filter Q: 1.2 (just over 1 octave)
• Maximum input level: +2 8dBu
• Maximum output level: +28 dBu (10 kOhms 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: 129 mA (maximum) per rail