> ## 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.

# Basic operations

> Powering SBS on and off, and using the three EQ presets on the back panel.

## Amplifier overview

All connections and controls are on the amplifier panel on the back of the speaker.

![Amplifier panel with numbered connections, status LEDs, select button, mains inlet and power switch](https://mintcdn.com/sigberg-audio/NhUFKdoMwLjN6EuK/images/diagrams/amplifier-panel.svg?fit=max\&auto=format\&n=NhUFKdoMwLjN6EuK\&q=85\&s=dedd9460bbbb874930449414540f31c7)

> [accordion] Photo of the amplifier panel
>
> ![Photo of the SBS amplifier panel](https://mintcdn.com/sigberg-audio/NhUFKdoMwLjN6EuK/images/amplifiers/hypex-fa123.png?fit=max\&auto=format\&n=NhUFKdoMwLjN6EuK\&q=85\&s=7149bc82c8e0181319c1d707d6249551)

## Powering on and off

We recommend leaving the speakers on, unless they will not be used for an extended period of time.

> [!WARNING]
>
> Always make sure the loudspeaker is powered OFF before connecting or disconnecting cables.

## EQ presets

SBS has three user defined EQ presets. For your convenience we have loaded example EQ configurations into preset 2 and 3.

Click the **select** button on the back of each speaker to switch between presets. The green LED lights marked P1 / P2 / P3 will indicate the active setting.

All presets can be customized further by the customer. See [Equalizer](https://docs.sigbergaudio.com/speaker-systems/sbs/equalizer.md) for details on how to do this.

### How the presets are configured from the factory

| Preset | Name | Use | Factory configuration |
| - | - | - | - |
| P1 | Reference | The SBS signature sound. Will normally give the most natural reproduction across music genres. | The user definable EQ is blank. |
| P2 | Air | More treble for well damped rooms or longer listening distances. | A high-shelf with center frequency 2 kHz and gain +2 dB. |
| P3 | Warm | For reflective or "naked" rooms, or a more relaxed sound. | A high-shelf with center frequency 2 kHz and gain -3 dB. |

### Preset 1: Reference

This is the SBS reference sound. It's the recommended setting for most situations, including studio use.

In this setting, the speaker is tuned to give the most natural and balanced in-room frequency response.

The user definable EQ for this preset is blank from the factory.

### Preset 2: Air

Preset 2 and 3 have the same base configuration as preset 1. In addition, the user definable EQ has been factory loaded with example configurations (this may be adjusted or changed by the customer).

In preset 2, the user definable EQ has been loaded with a high-shelf with center frequency 2 kHz and gain 2 dB.

This will give more treble and "air" in the sound, which may be suitable for long listening distances and/or well damped rooms.

### Preset 3: Warm

In preset 3, the user definable EQ has been loaded with a high-shelf with center frequency 2 kHz and gain -3 dB.

This will give a more relaxed sound, suitable for highly reflective rooms or nearfield listening.


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