Heritage Audio Symph EQ
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What you need to know
What you need to know
- Ultra-musical asymptotic equalization inspired by the Baxandall design philosophy, with curves that rise or fall progressively toward a limit value to keep sub-bass and ultra-high frequencies perfectly controlled.
- Parallel processing with extremely low phase deviation: a “tight, smooth and natural” sound, ideal for a master bus or mastering.
- Ultra-precise stepped controls: up to 10.5 dB of boost/cut in 0.5 dB increments (1 dB via the main selector + an additional 0.5 dB).
- Genuine integrated Mid/Side functionality and Carnhill transformer-based circuits with Class A outputs for a premium high-end analog character in a 1U rack unit.
Manufacturer Information
Heritage Audio
https://www.heritageaudio.com
info@heritageaudio.com
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Safety manager:
Heritage Audio S.L.
Email: info@heritageaudio.com
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The Essentials to Know About the Heritage Audio Symph EQ Stereo Equalizer
- Ultra-musical asymptotic equalization inspired by the Baxandall spirit, with curves that gradually rise or fall to a limit value to keep sub-bass and ultra-highs perfectly controlled.
- Parallel processing with very low phase deviation: a "tight, smooth, and natural" sound, ideal on a master bus or in mastering.
- Ultra-precise stepped adjustments: up to 10.5 dB boost/cut in 0.5 dB increments (1 dB via the main selector + an additional 0.5 dB).
- True integrated Mid/Side functions and Carnhill transformer circuits with Class A outputs for a high-end analog signature in a 1U rack unit.
From Baxandall to Asymptotic: Heritage Audio's Evolution for the Master Bus
In 1952, Peter Baxandall popularized a now-iconic equalizer topology, notably for its elegant way of offering bass and treble corrections with boost and cut, without resorting to expensive rotary switches. The Heritage Audio Symph EQ adopts this philosophy of efficiency but translates it into an asymptotic concept designed for today's demands: more control at the spectrum extremes, an immediate sense of musicality, and ergonomics geared towards instant recall in mastering.
Placed at the heart of the brand's studio range, this approach makes the Symph EQ an equalizer dedicated to finishing touches: it does not seek spectacular effects but the fine-tuning that stabilizes a mix, opens the stereo image, and polishes the top end without harshness.
A Mastering Equalizer for Those Who Want to Sculpt Without Altering
The Symph EQ is aimed at mixing and mastering engineers, as well as any studio wanting a 1U stereo equalizer capable of subtle interventions on a master bus, a stem, a subgroup (drums, music, vocals), or a summing chain. Its asymptotic behavior is particularly relevant when adding air or reinforcing the bass while keeping "at-risk" zones (sub and ultra-high) under control.
Thanks to the adjustment steps and control logic, it also perfectly suits hybrid workflows: settings can be documented and recalled quickly, reliable A/B comparisons can be made, and work can be done with half-dB precision on decisions that truly matter.
Technical specifications
| Category | equalizer | Rack unit | 1 |
| Number of channels | 2 | Analog outputs | XLR |
| EQ | 2 channels with advanced filter | Color | Grey |
| Valve | No | ||
Questions frequently asked
Is the Heritage Audio Symph EQ suitable for mastering and the master bus?
Its 2-channel stereo format in a 1U rack is designed for finishing touches on the master bus, stems, and subgroups. The asymptotic equalization allows controlling the lows and highs while limiting the impact on the extreme ends of the spectrum.
What precision settings does this equalizer offer?
Boost or cut adjustments reach 10.5 dB with a 0.5 dB resolution. A main switch progresses in 1 dB steps, while a knob adds 0.5 dB, and the CUT control reverses the correction direction.
Which high frequencies are available on the Symph EQ?
Six selectable points: 8, 10, 12, 15, 20, and 24 kHz.
Does the Symph EQ have high-pass and low-pass filters?
Two filters with a 12 dB per octave slope are integrated on concentric controls. The high-pass offers 15, 20, 47, 82, and 160 Hz, while the low-pass offers 10, 12, 18, 22, and 30 kHz. An OFF position is provided for each filter.
How does the Mid/Side processing work on this equalizer?
The Mid/Side mode allows separate processing of the stereo center and sides. It becomes possible to adjust the central energy, such as vocals or bass, and tweak the side ambiances. Carnhill input transformers and class A 73-style output stages contribute to the analog chain.



