# Audio Operation

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To switch on the radio, press the on/off button (15). The display (16) is activated and the audio source that was set the last time the radio was switched off is played back.

To switch off the radio, press the on/off button (15) again. The current setting of the audio source will be saved.

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After the radio is switched on, the volume is always set to low.

To increase the volume, turn the clock button (14) ‎(GPB 18V‑5 C)‎ or the menu button (22) ‎(GPB 18V‑5 SC)‎ clockwise; to reduce the volume, turn anticlockwise.

The volume setting will appear in the display with a value between 0 and 30. Before adjusting or changing a radio station, set the volume to a low setting; before starting an external audio source, set the volume to a medium setting.

To switch off the sound, you can briefly press the mute button (12). The mute indicator (f) will appear in the display.

To switch on the sound again, either briefly press the mute button again or turn the clock button (14) ‎(GPB 18V‑5 C)‎ or the menu button (22) ‎(GPB 18V‑5 SC)‎ clockwise.

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An equalizer is integrated in the radio for optimal sound reproduction.

The treble and bass setting can be manually changed or sound pre-sets for various music styles can be used. You can choose from the pre-programmed settings JAZZ, ROCK, POP and CLASSIC, as well as the individually programmable setting CUSTOM. The sound settings are saved separately for each audio source.

To select one of the stored sound pre-sets, press the equalizer button (20) briefly as many times as needed until the required setting appears on the sound pre-set indicator (i) in the display.

Changing the Setting CUSTOM:

- You can adjust the treble and the bass within a range of −5 to +5.
- Press the equaliser button (20) for longer than 0.5 seconds. CUSTOM appears on the sound pre-set indicator (i) in the display.
- GPB 18V‑5 C: TRE is shown on the treble/bass indicator (d); the current treble value flashes. Turn the clock button (14) to change the treble. Press the clock button (14) to save the set value.
  BAS and the current bass value will now be shown on the treble/bass indicator (d). Change and save the bass setting in the same way as described for the treble.
- GPB 18V‑5 SC: <Treble> and the current value of the treble will be shown on the multi-function indicator (k). Turn the menu button (22) to change the treble. Press the menu button (22) to save the set value.
  <Bass> and the current bass value will now be shown on the multi-function indicator (k). Change and save the bass setting in the same way as described for the treble.
- After saving the bass setting or 10 seconds after last using the clock button (14)/menu button (22), the radio will return to the standard display screen.

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To select an audio source, press the source button (18) until the required internal or external audio source is shown in the display:

- DAB: Digital radio via DAB+ ‎(GPB 18V‑5 SC)‎,
- FM: Analogue radio via FM,
- AUX: External audio source (e.g. CD player) via the 3.5-mm socket AUX IN (10) in the media compartment,
- : External audio source (e.g. smartphone) via the Bluetooth® connection.

The current audio source can be seen on the audio source indicator (h) or Bluetooth® indicator (g).

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To select the audio source DAB+ radio stations, press the source button (18) as many times as needed until DAB appears on the audio source indicator (h).

After a short initialisation, the last set radio station will be played back.

Each station name appears on the top line of the multi-function indicator (k). The additional information shown on the bottom line of the multi-function indicator can be set with the menu function.

- To switch the station, turn the source button (18) until the required station is shown in the display. Press the source button (18) to confirm the selection. The radio will switch to the selected station.
  Alternatively, you can press the seek button (scan down) (13) or the seek button (scan up) (19) to switch the station.

- To save a set station, press the preset button (17) of the required preset space until the number of the preset space appears on the preset indicator (c).

- To start playback of a saved station, briefly press one of the preset buttons (17). The number of the preset space will appear on the preset indicator (c).

Note: In the event of reception problems, you can manually start the DAB+ station search. To do this, either select <Auto Scan> from the menu or press the seek button (scan down) (13) and the seek button (scan up) (19) simultaneously. After the station search is complete, four stations will be saved in preset spaces 1 to 4. Stations that have already been saved will be overwritten here.

If no DAB+ radio stations can be found, <No DAB Station – Please Auto Scan> will appear on the multi-function indicator (k).

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To select the audio source FM radio stations, press the source button (18) as many times as needed until FM appears on the audio source indicator (h).

GPB 18V‑5 C: During adjustment, the radio frequency appears on the time indicator (j) and then on the radio frequency indicator (a).

GPB 18V-5 SC: The frequency of each current station will appear on the top line of the multi-function indicator (k). The additional information shown on the bottom line of the multi-function indicator can be set with the menu function.

If there is sufficiently good reception of a suitable signal, the radio will automatically switch to stereo reception, and the stereo indicator (e) will appear in the display.

- To set a specific station, turn the source button (18) until the required frequency or the required station is shown in the display.
- To search for the next station with high signal strength, briefly press the seek button (scan down) (13) or the seek button (scan up) (19). The next station found is shown in the display and played back.
- To search for all stations with high signal strength, press the seek button (scan down) (13) or the seek button (scan up) (19) for longer than 0.5 s. Any station found is played back for 5 s, then the search is continued until the end of the frequency band. To cancel the station search, briefly press the seek button (scan down) (13) or the seek button (scan up) (19).
- To save a set station, press the preset button (17) of the required storage space until the number of the storage space appears on the storage space indicator (c).
- To automatically search for and save the stations with the best reception, press the seek button (scan down) (13) and the seek button (scan up) (19) simultaneously. The radio will check all receivable stations and save the four stations with the best reception in preset spaces 1 to 4. Please note that stations that have already been saved will be overwritten here where necessary.
  Once the search has finished, the station saved in preset space 1 will be played back.
- To start playback of a saved station, briefly press one of the preset buttons (17). The number of the storage space will appear on the storage space indicator (c).

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The radio is supplied with a fitted rod antenna (30). For FM radio operation, point the rod antenna in the direction that enables the best reception.

If the reception is insufficient, position the radio at a different location that enables better reception.

Note: When operating the radio in the direct vicinity of radio-communication equipment or radio transceivers, or other electronic equipment, the radio reception can be subject to interference.

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Disengage the locking lever (8) and open the cover (7) of the media compartment. Insert the 3.5‑mm connector for the AUX cable (9) into the AUX IN socket (10). Connect the AUX cable to a suitable audio source.

To play back the AUX audio source, press the source button (18) until AUX appears on the audio source indicator (h).

After removing the AUX cable connector, close the cover (7) of the media compartment again and lock it to protect against dirt.

If it fits, you can also place an audio source connected via AUX in the storage compartment (6).

If one of the preset buttons (17) is pressed during AUX operation, the radio will switch to the station that was saved in the last used radio operating mode.

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To play back an audio source (e.g. smartphone) via Bluetooth®, either press the source button (18) until the Bluetooth® indicator (g) appears in the display, or briefly press the Bluetooth® button (21) regardless of the current audio source.

If the radio has already been connected to an external audio source via Bluetooth® and if this audio source is available, a connection to this audio source will automatically be established. As soon as the connection is established, the Bluetooth® indicator (g) will light up continuously.
GPB 18V‑5 SC: The name of the device connected via Bluetooth® is displayed on the top line of the multi-function indicator (k). The text from the connected device appears on the bottom line.

If a connection cannot be established within two minutes, the connection set-up will be cancelled and the Bluetooth® indicator (g) will flash continuously.
GPB 18V‑5 SC: <Not connected> will appear on the multi-function indicator (k).
The radio will shut off automatically after another 17 minutes without a connection being established.

Establishing a new Bluetooth® connection:

- To establish a connection to a new external audio source, press the Bluetooth® (21) button for longer than 0.5 seconds. This is also possible during a search process, if there is an existing connection or when operating with another audio source.

- The radio will start the search process. During the search process, the Bluetooth® indicator (g) will flash.

- Activate the connection via the external audio source. For smartphones, that is generally possible via the settings in the Bluetooth® menu. The radio will appear as an available source under the name GPB 18V-5 C xxxx or GPB 18V-5 SC xxxx. Please observe the operating instructions for your audio source/smartphone.

- As soon as a connection is established via Bluetooth®, the Bluetooth® indicator (g) will light up continuously.

The audio source connected via Bluetooth® can also be controlled via the radio:

- To select a track and to start playback, briefly press the seek button (scan up) (19) or the seek button (scan down) (13) until the required track has been reached. Playback of the selected track is started automatically.

- To interrupt playback, press the mute button (12). The mute indicator (f) appears in the display.

- To continue playback, press the mute button (12) again, change the volume or press the seek button (scan up) (19) or the seek button (scan down) (13).

- To fast-forward or rewind within a track, press and hold the seek (scan up) button (19) or the seek (scan down) button (13) until the required place in the track has been reached.

If one of the preset buttons (17) is pressed during operation via Bluetooth®, the radio will switch to the station that was saved in the last used radio operating mode.

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To access the time indication menu, briefly press the clock button (14).

You can choose between 12-hour <12H> and 24-hour <24H> time formats; you can also set the hours and minutes.

Navigating in the menu:

- Change menu settings: Turn the clock button (14).
- Save menu settings: Press the clock button.
- After saving the minutes setting or 10 seconds after last using the clock button, the radio will return to audio operation.

Change the back-up batteries when the radio no longer saves the time.

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To return all settings on the radio to factory settings (reset), press the clock button (14) for longer than 0.5 seconds. <RS> appears in the display.

Turn the clock button (14) to select between resetting <YES> and returning to the current settings <NO>. Confirm your selection by pressing the clock button.

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To access the menu function, press the menu button (22).

Navigating in the menu:

- To scroll through a menu: Turn the menu button (22).
- To select and save a menu setting: Press the menu button (22).
- To switch to a submenu: Press the menu button (22).
- To switch from a submenu back to a higher menu: Press the seek button (scan down) (13). If the highest menu level has been reached, the radio will return to audio operation.

To leave the menu function on any level and return to audio operation, press the seek button (scan down) (13) for longer than 1 second. Alternatively, the radio will automatically switch back to audio operation 10 seconds after the last press of a button.

If menu settings are no longer being saved when you switch off the radio, replace the back-up batteries.

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The menu selection is partially dependent on the audio operating mode of the radio.

Within the menus, the name of each menu is displayed on the top line of the multi-function indicator (k), and the selectable setting on the bottom line.

<Set Time>
Time menu: You can choose between 12-hour <12 Hour Mode> and 24-hour <24 Hour Mode> time formats, and adjust the time manually. If a radio station that transmits the time is selected with the DAB audio source, this time is automatically adopted.

<Reset All>
Reset menu: You can reset all menu settings to factory settings <Yes> or return to the current settings <No>.

<Auto Scan> (with DAB audio source)
Automatic station search menu: You can start an automatic station search.

<Manual Tune> (with DAB audio source)
Manual set-up menu: You can set the required frequency manually.

<Display Type> (withDAB audio source)
Display mode menu: You can choose what text will appear on the bottom line of the multi-function indicator (k):

- The information broadcast by the radio station <Dynamic Label>,
- The frequency of the station <Frequency>,
- The signal strength <Signal Strength>,
- The program type broadcast by the radio station <Program Type>.

<Display Type> (withFM audio source)
Display mode menu: You can choose what text will appear on the bottom line of the multi-function indicator (k):

- The information broadcast by the radio station <Radio Text>,
- The station name <Program Service>,
- The program type broadcast by the radio station <Program Type>.