- Helium combines capacitor based EQ circuits and filters with inductor based EQ circuits. Helium is the combination of our Carbon and Iridium EQ, with extra filter circuits added.
- 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 our 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.
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, 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 (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, 0.4 kilos
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