Interphase Audio Helium 500 - 4-Band Hybrid Equaliser

Interphase Audio Helium 500 - 4-Band Hybrid Equaliser

The Interphase Helium is a full Class-A, discrete design, and all components have been carefully chosen and matched to provide an extremely musical sound.
This is definitely not a “clone” or “copy” (Interphase Audio do not build clones or copies of anything). Like all Interphase products, Helium is unique and features great sound and straight forward functionality.

The four bands have large overlapping frequency controls, making it well-suited for minimising 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 our inductive EQ, with custom-wound Carnhill inductors on the lo-mid band.

Each band can be cut or boost with as much as 15dB per band.

Interphase Helium Specifications:

• Input impedance: 30kohm
• Common mode rejection: 80dB
• Distortion: 0.001% (+4dBu output, 1kHz)
• Frequency response: 7Hz to 70kHz (-3dB)
• Boost / Cut range: +/-15dB (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 - 4k Hz (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 (500 module): +28dBu
• Maximum input level (51x module): +32dBu
• Maximum output level (500 module): +28dBu (10k load)
• Maximum output level (51x module): +32dBu (10k load)
• Nominal input and output level: +4dBu (electronically balanced)
• Output impedance: 100 ohm
• Noise floor (typical, unweighted, EQ on): -80dBu
• Noise floor (unweighted, EQ off): -100dBu
• I/O connections (Rack XLRs): pin 2 +, pin 3 -, pin 1 ground
• Current requirement: 129mA (maximum) per rail
• Size and weight: Standard 500 Series, 0.7 kilos