> ## 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 Saranna 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 Saranna amplifier panel](https://mintcdn.com/sigberg-audio/NhUFKdoMwLjN6EuK/images/amplifiers/hypex-fa253.png?fit=max\&auto=format\&n=NhUFKdoMwLjN6EuK\&q=85\&s=69d369961ae3794b051d365385a74171)

## 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

Saranna has three user defined EQ presets to adjust the bass level. 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/saranna/equalizer.md) for details on how to do this.

### How the presets are configured from the factory

| Preset | Name | Factory configuration |
| - | - | - |
| P1 | Reference | The user definable EQ is blank. |
| P2 | +1.5 dB | A shelf filter that increases the bass by 1.5 dB. |
| P3 | +3 dB | A shelf filter that increases the bass by 3 dB. |

### Preset 1: Reference

This is the Saranna reference sound, tuned to give the most natural and balanced in-room frequency response for most situations.

The user definable EQ in preset 1 is blank from the factory.

### Preset 2: +1.5 dB

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 shelf filter that increases the bass by 1.5 dB.

This will give a fuller sound that may be suitable for larger rooms and/or moderate listening levels, or if the speakers are further from the wall than recommended.

### Preset 3: +3 dB

In preset 3, the user definable EQ has been loaded with a shelf filter that increases the bass by 3 dB.

If you desire even more bass and/or have a large room, this setting offers more bass. This preset can also work well for movies.


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