> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sigbergaudio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Equalizer

> Use the parametric EQ in the Sigberg Audio subwoofers, and define your own crossover.

> [!WARNING]
>
> Equalizing bass response is an advanced topic, and learning how to do that is beyond the scope of this user manual. Feel free to reach out to us if you have additional questions about this. Please do not randomly change things in the equalizer if you don't know how to do it. Worst case, you may damage your subwoofer.

## Install the software

The software needed to access the parametric EQ can be downloaded from [sigbergaudio.no/manuals](https://www.sigbergaudio.no/manuals). Windows 7 or higher is required.

After installing the software, locate the Hypex filter designer (HFD) and launch the software. Connect the subwoofer to your computer via the included USB cable, and the software will automatically detect your subwoofer.

## Basic instructions for the parametric EQ

> [!NOTE]
>
> The EQ is configured independently for each preset.

The EQ should be used primarily to reduce peaks caused by room modes in order to achieve a smoother in-room response, not add boost.

**1. Open the EQ**

With the HFD software active and the subwoofer connected, click the **EQ** button in the HFD interface.

**2. Add a filter**

Click one of the nine circles in the graph or one of the EQ buttons below the graph, and change the desired parameters.

**3. Apply the changes**

Make sure **EQ Enabled** is selected, and then click the **Upload to DSP** button.

### Filter parameters

| Parameter | What it does |
| - | - |
| Center frequency | The frequency you want to boost or cut. |
| Q factor | A low number means a wider frequency range is affected, a higher number means a more narrow frequency range is affected. |
| Gain | Add a positive number to increase (boost) volume in the selected frequency range, and a negative number to reduce (cut) volume. Typical settings: +3/-6 dB. |

> [!TIP]
>
> Trying to use all nine filters to perfectly flatten the response isn't always a good idea. Two or three well placed filters may actually sound best even though the result isn't perfectly flat.

> [!WARNING]
>
> We strongly advise against adding boost beyond 3 dB.

## Defining crossovers

If you don't have an amplifier with crossover capabilities and the default 45 Hz crossover (preset 3) isn't appropriate for your setup, the EQ can be used to emulate the crossover frequency of your choice.

**1. Select preset 1**

Select preset 1 on the subwoofer.

**2. Open the EQ**

With the HFD software active and the subwoofer connected, click the **EQ** button in the HFD interface.

**3. Set up EQ-1**

Select **EQ-1** and enter the values in the table below.

**4. Set up EQ-2**

Select **EQ-2** and enter the values in the table below.

**5. Apply the changes**

Make sure **EQ Enabled** is selected, and then click the **Upload to DSP** button.

| Setting | EQ-1 | EQ-2 |
| - | - | - |
| Type | ShelfHi | ShelfHi |
| Center frequency | Desired crossover frequency (example: 80 Hz) | Double the number entered in EQ-1 (example: 160 Hz) |
| Q factor | 0.8 | 0.8 |
| Gain | -16 dB | -16 dB |


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