AC-4475S Dual DAB Receiver User Manual

© 2025 ATOTO Corporation

V2025.1

Preface

Thank you for choosing ATOTO

As an innovative brand with a decade of dedicated expertise in automotive electronics, ATOTO upholds the core philosophy of "Think Beyond, Live Ahead" . We seamlessly integrate professional audio-visual technology and user-friendly interactive features to elevate every journey with refreshing experiences.

Copyright Statement

The copyright and related intellectual property rights of these manuals (including electronic and printed versions) are exclusively owned by ATOTO. Without explicit written authorization from ATOTO, no organization or individual may use the content in any form (including but not limited to copying, distributing, adapting, translating, mirroring, or reposting) for commercial purposes or provide it to third parties.

FCC Compliance Statement

The FCC Compliance Statement is an official declaration by ATOTO to users indicating that the product complies with the radio frequency interference and electromagnetic compatibility (EMC) regulations of the U.S. Federal Communications Commission (FCC). The specific statement is as follows:

This device strictly complies with all provisions of Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1.This device must not cause harmful interference;

2.This device must accept any interference received, including interference that may cause undesired operation.

Contact ATOTO Customer Support

If you encounter any issues during installation or use, our support team is ready to assist.

Email: support@atotoglobal.com

Scan the QR code to access your product model's online resources, including features, installation guides, and extended warranty details.
 (Note: No personal information is required.)

Chapter 1 Important Information

1.1 About this Manual

This manual is designed to guide you through the basic installation process of ATOTO products and help you understand their core functions.

As shown below, along with Installation and Features, you’ll also find FAQs, E-Warranty, Subscription, Firmware Upgrades, and App Downloads—all aimed at delivering a smoother and more enjoyable product experience.

Here is a brief overview of the sections relevant to your product:

FAQs

Find answers to commonly asked questions about your ATOTO product. From installation tips to troubleshooting steps, this section helps you resolve issues quickly and get the most out of your device.

E-Warranty

Register here to extend your product warranty beyond the standard coverage. Enjoy added peace of mind and continued protection for your ATOTO products.

Subscription

Subscribed to new feature updates? This section displays the latest feature releases and enhancements available for your device. Stay informed and unlock new capabilities as they become available.

1.2 Installation Warnings

Vehicle Condition

For safety, always install or connect the receiver while the vehicle is turned off. Installing while the engine is running may cause electrical hazards or safety risks.

Environment Conditions

For best performance, perform pairing in a dry, clean, and low-interference environment. Avoid high humidity, dusty areas, or environments with strong electromagnetic interference.

Connection Failure Handling

If the receiver is not recognized or fails to connect, follow the re-connection steps provided in this manual (e.g., re-seat the USB cable, try a different head-unit USB port, allow USB permissions, then re-scan). If the issue persists, please contact customer support. Do not disassemble or modify the product yourself.

Power & USB Connection

Ensure the DAB receiver is connected to the head unit using the supplied USB Type-C cable (or an equivalent shielded USB cable).

Important: This DAB receiver has no built-in battery or charging function; it operates on 5 V power from the head unit’s USB port.

Avoid routing or placing the receiver and cables in extremely hot or humid environments.

Operation Safety

Do not operate or adjust the DAB app while driving to avoid distractions.

Keep the device out of reach of children to prevent misuse or damage.

Avoid exposing the device to extreme heat, direct sunlight, or high humidity

1.3 Compatibility

• AC-4475S DAB+ Receiver is compatible with ATOTO A5L, A6, S8, and P9 1M/P9 1X series head units, where the DAB+ app is pre-installed for plug-and-play operation.
• When used with third-party Android car stereos, manual installation of the DAB+ app is required before use.
• This receiver is not compatible with ATOTO F7, X10, P5, P8, or P9 2M series.

1.4 Regional Availability and Usage Restrictions

AC-4475S DAB+ service availability is region-dependent. AC-4475S DAB+ Receiver is intended for use in markets where DAB/DAB+ broadcasts are deployed, primarily across Europe and Australia. Outside these regions, coverage may be limited or unavailable. Please verify local DAB+ network availability, frequency allocations, and regulatory compliance before purchase and installation. This receiver supports DAB+ operation in VHF Band III (approx. 174–240 MHz) as used by most broadcasters and does not receive AM/FM, HD Radio (North America), or satellite radio services. Use is subject to local spectrum regulations and broadcaster deployment.

Chapter 2 Installation

2.1 What’s in the Box

DAB+ receiver box×1

USB Type-C cable×1

DAB antenna×1

Quick Start Guide

Online Manuals Quick Guide

2.2 Important Notes Before Installation

• Park safely, switch the ignition OFF, and remove the key.
• Plan cable routes that avoid airbags, sharp edges, pedals, and moving parts.
• Clean the glass and trim surfaces where the antenna and cables will be attached.

2.3 Parts You’ll Use (as shown)

• DAB+ receiver box
• DAB antenna with amplifier (glass-mount)
• MCX antenna cable (from antenna amplifier to receiver box)
• USB Type-C cable (receiver box to head unit USB)
• Adhesive pads/clips for cable management

2.4 installation procedure

Step 1：Install the DAB+ app

1. Install the DAB+ app in the Android head unit (see download link below)

（The user interface of the DAB+ app）

1. Download link:

DAB* app: https://file.myatoto.com/FILE_UPLOAD_URL_2/202652156318/DABPlus-DF2.20.4.apk

NOTE: lf you found these links invalid, please get in touch with ATOTO Customer Support Team on the website https://www.myatoto.com to get the latest one.

Step 2： Mount the DAB Antenna

1. Disassemble the plastic border of the right window.
2. Remove the protective paper from the black film and transparent film on the Antenna.
3. Stick the black film on the metalframe an transparent film on the glass.(Remember to leave the space for putting the plastic border)
4. Tighten the black film and transparent film and fix the cable securely.
5. Put the plastic border back.(Be careful do not break the cable)

Step 3 — Route the Antenna Cable

1. Route the antenna cable down the A-pillar trim.
2. Tuck the cable behind trim panels where possible; use the supplied clips/tape to secure.
3. Bring the plug to the planned receiver box location (typically behind/under the dash, near the head unit).

Step 4 — Place the DAB Receiver Box

1. Choose a dry, ventilated spot behind the dashboard or in the glovebox area.
2. Fix the receiver box using adhesive pads or screws/brackets as provided.
3. Connect the MCX plug from the antenna amplifier to the RF input of the DAB receiver box.
4. If your model has two RF ports, connect the second antenna to the second port.

【AI图解: AC-4475S DAB+ receiver installation overview, showing how to connect the DAB antenna (with amplifier) to the receiver box and power/connect the receiver to the head unit via the USB cable, with an example cable routing and mounting position inside the vehicle.】

Chapter 3 Using the DAB+ App

【AI 图解: DAB+ app interface overview, labeling the main playback controls, signal/status indicators, station list and favorites, and menu options used to browse ensembles and program types.】

• Slideshow: Shows images or station logos broadcast by the service.
• Radio Signals: Live signal strength indicator.
• Station Name: Name of the currently playing station.
• Ensemble: Name of the multiplex (service group) you are tuned to.
• Radio Frequency: The current Band III frequency.
• Type of Program: PTY category such as News, Music, etc.
• Playback Status: Visual cue for play/pause.
• Previous Station: Switch to the previous station in the list.
• Pause / Play: Toggle audio playback.
• Next Station: Switch to the next station in the list.
• Click to expand the List (Stations): Opens the full list of received stations.
• Click to expand the Ensemble List: Opens all available ensembles; select one, then choose a station.
• List of Favorite Stations: Your saved stations for quick access.
• Hearts / Unfavorite: Tap to add/remove the current station from Favorites.
• Radio Serial Number: Order/index number of a station in the list.
• PTY List: Browse stations by program type (News, Sport, Pop, etc.).
• Background Full-Band Search: Background scan that updates the list while you listen.
• Service Following (DAB→DAB): Seamless following of the same service across regions; enabled by default.

3.1 Screen Map — What each element does

1.Previous Station: Switch to the previous station in the list.

2.Pause / Play: Toggle audio playback.

3.Next Station: Switch to the next station in the list.

4.Hearts / Unfavorite: Tap to add/remove the current station from Favorites.

5.List of Stations: Opens the full list of received stations.

6.List of Favorite Stations: Your saved stations for quick access.

7.PTY List: Browse stations by program type (News, Sport, Pop, etc.).

3.2 First-Time Setup

1. Open the DAB+ app on your Android head unit.
2. Select Full Scan / Full-band Search to build the initial station and ensemble lists.
3. When scanning completes, pick a station to start playback.If no stations are found, check antenna placement/grounding and try another scan.

3.3 Daily Playback Controls

• Use Previous / Next to step through stations.
• Tap Pause/Play to toggle playback.
• Tap the Heart to add to Favorites; tap again to remove.
• Open Favorites to play from your saved stations.

3.4 Finding Stations

• By Station List: Tap Station List and choose any station.
• By Program Type: Open PTY list, choose a type (e.g., News), then select from the filtered results.

3.5 Keeping the List Fresh

• Ensure Background Full-Band Search is turned on so unavailable stations are removed and new ones are added while you listen.
• After long trips across regions, run Full Scan again to refresh ensembles and stations.

3.6 Service Following (Seamless DAB→DAB)

• Enabled by default. While driving across coverage areas, the app attempts to keep playing the same service by switching to the best available ensemble automatically.
• If you prefer manual control, you can switch ensembles from the Ensemble list at any time.

3.7 Quick Tips

• Slide left/right on station cards to browse quickly.
• For the best reception, keep the antenna lead tidy and away from heavy power looms.
• If slideshow or DLS text is missing, try another station—these features depend on the broadcaster.

Chapter 4 Troubleshooting

1. No stations found after scanning

• Run a Full Scan again and make sure your area has Band III (174–240 MHz) DAB coverage.
• Check the antenna connection: the amplifier/antenna must be firmly attached and grounded to metal as instructed; avoid metallic/heat-reflective film areas if possible.
• If using an external box, use a shielded USB cable as recommended.

2. USB device not detected

• Ensure the receiver is connected to the head unit via USB and that the DAB APK is installed; the device is plug-and-play after APK installation.
• Unplug/re-insert the USB; try another USB port on the head unit.
• Grant the USB permission prompt in the DAB app if it appears.

3. Weak or unstable reception

• Verify the antenna position and cable routing; keep RF cable away from thick power looms where possible.
• Use an active glass antenna (with amplifier) to enhance DAB+ reception as recommended.

4. Background scan/list not updating

• Enable BGS (Background Scan) in the app so the list can update while listening.
• After long trips across regions, run a Full Scan once to refresh the ensemble list.

5. Service does not follow when crossing regions

• Confirm the app build supports DAB→DAB seamless service following and that stations being compared are the same service ID.
• If following still fails, perform a manual scan in the new area.

6. Slideshow/DLS text not shown

• These features depend on broadcaster support. Try another service to verify. Features listed: Slideshow, DLS, PTY, TA, station logo, favorites.

7. App cannot be installed or launched

• Use an Android head unit and install the provided DAB APK per instructions.
• If the build is outdated, update to the latest app/UI per your package notes.

Chapter 5 Technical Specifications

5.1 Module Specifications

1. Power Supply and Consumption

2. Power output and Consumption

1. Environmental & Physical

1. Electric Performance

5.2 Specification Requirements

Frequency: 174MHz~240MHz (Band III)

Impedance: 50Ω

Gain: 15dB±3dB (Band III)

S.W.R.: ≤3.0:1

Noise figure: ≤2dB

The USB cable of the external DAB+ box uses shielded wire.

Uses an active glass antenna with amplifier to enhance DAB+ reception capability.

5.3 DAB Frequency Table

5A — 174.928 MHz

5B — 176.640 MHz

5C — 178.352 MHz

5D — 180.064 MHz

6A — 181.936 MHz

6B — 183.648 MHz

6C — 185.360 MHz

6D — 187.072 MHz

7A — 188.928 MHz

7B — 190.640 MHz

7C — 192.352 MHz

7D — 194.064 MHz

8A — 195.936 MHz

8B — 197.648 MHz

8C — 199.360 MHz

8D — 201.072 MHz

9A — 202.928 MHz

9B — 204.640 MHz

9C — 206.352 MHz

9D — 208.064 MHz

10A — 209.936 MHz

10N — 210.096 MHz

10B — 211.648 MHz

10C — 213.360 MHz

10D — 215.072 MHz

11A — 216.928 MHz

11N — 217.088 MHz

11B — 218.640 MHz

11C — 220.352 MHz

11D — 222.064 MHz

12A — 223.936 MHz

12N — 224.096 MHz

12B — 225.648 MHz

12C — 227.360 MHz

12D — 229.072 MHz

13A — 230.784 MHz

13B — 232.496 MHz

13C — 234.208 MHz

13D — 235.776 MHz

13E — 237.488 MHz

13F — 239.200 MHz