Helium combines capacitor based EQ circuits and filters with inductor based EQ circuits.<\/p>\n
Helium is the combination of our Carbon and Iridium EQ, with extra filter circuits added.<\/p>\n
Helium is a full Class-A, discrete design, and all components have been carefully chosen and matched to provide an extremely musical sound.
\nThis is definitely not a \u201cclone\u201d or \u201ccopy\u201d (we at Interphase Audio do not build clones or copies of anything).
\nLike all our products, Helium is unique and features great sound and straight forward functionality.<\/p>\n
The four bands have large overlapping frequency controls, making it well-suited for minimising problematic frequencies, or giving an extra boost to others.
\nThe HF and LF band can be used as either bell-curved EQ or as – 12 dB per octave – hi\u2014cut \/ lo-cut filter.
\nThe two middle bands feature our inductive EQ, with custom-wound Carnhill inductors on the lo-mid band.<\/p>\n
Each band can be cut or boost with as much as 15dB per band.<\/p>\n
Specifications<\/p>\n
\u2022 Input impedance: 30kohm
\n\u2022 Common mode rejection: 80dB
\n\u2022 Distortion: 0.001% (+4dBu output, 1kHz)
\n\u2022 Frequency response: 7Hz to 70kHz (-3dB)
\n\u2022 Boost \/ Cut range: +\/-15dB (continuously variable)
\n\u2022 HF Frequency: 1.2 kHz – 22 kHz (continuously variable)
\n\u2022 HF Frequency switchable to 12 dB per octave sweepable Hi-Cut filter 1.2 kHz – 22 kHz
\n\u2022 HMF Frequency: 1.5, 3, 5 6, 7, 8 kHz (stepped)
\n\u2022 LMF Frequency: 125, 250, 500, 1k, 2k, 4 kHz (stepped)
\n\u2022 LF Frequency: 25 Hz – 440 Hz (continuously variable)
\n\u2022 LF Frequency switchable to 12 dB per octave sweepable Lo-Cut filter 25 Hz – 440 Hz
\n\u2022 Filter Q: 1.2 (just over 1 octave)
\n\u2022 Maximum input level (500 module): +28dBu
\n\u2022 Maximum input level (51x module): +32dBu
\n\u2022 Maximum output level (500 module): +28dBu (10k load)
\n\u2022 Maximum output level (51x module): +32dBu (10k load)
\n\u2022 Nominal input and output level: +4dBu (electronically balanced)
\n\u2022 Output impedance: 100 ohm
\n\u2022 Noise floor (typical, unweighted, EQ on): -80dBu
\n\u2022 Noise floor (unweighted, EQ off): -100dBu
\n\u2022 I\/O connections (Rack XLRs): pin 2 +, pin 3 -, pin 1 ground
\n\u2022 Current requirement: 129mA (maximum) per rail
\n\u2022 Size and weight: Standard 500 Series, 0.4 kilos<\/p>\n
Helium is available in 3 versions:
\n* as 500 series module
\n* as 51x series module
\n* as DIY module<\/p>\n
Unclear about the difference between 500 and 51x modules? Check our 500 page<\/p>\n","protected":false},"excerpt":{"rendered":"
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