Tight, sweet and natural tone shaping for your whole mix. The Heritage Audio SYMPH EQ (Stereo Asymptotic Equalizer) is a one-rack-space master bus and mastering equalizer. It replaces the classic Baxandall shelving topology with a more musical equivalent whose shelves stop at a set limit, keeping the ultra highs and sub lows under control. It is built for mix and mastering engineers.
Why customers choose it
Who it is for
Mixing and mastering engineers, studios adding a final analogue stage to the stereo bus, and producers who want M/S control of their mixes.
What’s in the box
- 1 x Heritage Audio SYMPH EQ
- AC power cord EU and US
- Power supply HA-PSU03
Specifications
| Type | Stereo / M/S shelving equalizer, 1U |
|---|---|
| High shelf | 8, 10, 12, 15, 20, 24 kHz |
| Low shelf | 20, 60, 110, 220, 360, 470 Hz |
| Boost / cut | 10.5 dB max, 0.5 dB steps |
| High-pass filter | 12 dB/oct at 15, 20, 47, 82, 160 Hz |
| Low-pass filter | 12 dB/oct at 10, 12, 18, 22, 30 kHz |
| Input impedance | 10 kohm bridging, transformer balanced |
| Output impedance | Under 75 ohm, transformer balanced, drives 600 ohm |
| Maximum output | Over +26 dBu into 600 ohm |
| THD | Under 0.025% at 1 kHz |
| Frequency response | 20 Hz (+0.3 dB) to 20 kHz (-0.2 dB) |
| Noise | Under -89 dBu, EQ flat |
| Connectors | Gold-plated XLR, stereo and M/S in/out |
| Made in | EU |
| Channels | 2 (stereo or M/S) |
| Transformers | Carnhill |
Good to know
- Inputs and outputs are balanced and ground-free but also work with unbalanced gear.
- Each channel has its own hard bypass (BP-L / BP-R), plus ON and M/S or stereo mode switches.
FAQ
Why “asymptotic”?
The shelf curves rise until they reach a set value and then level off, so the extreme highs and lows never get out of control.
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