H2 Audio Helios 5011 500 Series Equalizer

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The 5011 is the EQ section from the 0011 in a 500 series package. Featuring an electronically balanced input and transformer balanced output with amp circuit, and the exact same EQ circuit as the 0011.

The Helios 0011 “type 69” channel module was the heart of the most legendary recording desks of the late 60’s British Invasion. Helios is one of the first console manufacturers that mass-produced mixing desks for the recording studio industry in England and eventually worldwide. The list of artists whose music passed through a Helios desk between 1964 to 1980 is staggering, and the sonic characteristics are synonymous with a whole generation of music.

H2 Audio has painstakingly recreated the original Helios 0011, adhering to the original design and sound. In doing so, H2 Audio has created the most sonically accurate version of this recording industry legend to date.


• Input Impedance: 15kΩ, electronically balanced
• Maximum Input Level: 24dBu/27dBu (bypassed, engaged)
• HF Band: 10kHz +/- 10dB Boost/Cut
• Mid-band Frequencies: 0.7, 1.0, 1.4, 2.0, 2.8, 3.5, 4.5, 6kHz
• Mid-band Boost: 16dB
• Mid-band Cut: -17.5dB
• LF Boost Frequencies: 60, 100, 200, 300Hz @15dB
• LF Cut: 3, 6, 9, 12, 15dB @50H