Axton A642DSP 5-Channel Smart Digital Amplifier

Main Features

• 5-channel Smart Digital Amplifier with iOS or Android App controlled audio DSP functions
• Class A/B front/rear channel amp for best sound quality, Class D sub channel amp for best sound quality and power ratio
• DSP-controlled 5-channel Preout (6 Volt) including REM out to control additional amplifiers
• Bluetooth 5.0 Audio Streaming with automatic source switching
• Optical and Coaxial input for lossless audio data transmission. Optional AXTON ABT50 device allows Hi-Res Audio music files losslessly via Bluetooth or OTG cable.
• Optional Remote Control with direct Master Volume and Bass Level Control
• Plug'N'Play quick installation system via optional vehicle brand and model specific ISO wire harness
• Auto-Turn-On function

Safety Instructions

• Do not operate functions that distract while driving.
• Keep volume at a low level to hear exterior noises.
• Do not open or modify the amplifier.
• Only use with 12V mobile applications.
• Use fuses of the correct amperage.
• Do not obstruct radiators and/or vents.
• Ensure all connections are properly made.
• Do not use fasteners from steering or braking systems for ground connection.
• Keep small objects away from children.
• Disconnect the negative terminal of the battery before starting installation.

Technical Specifications

Connections + Controls

1 ANTENNA: External Bluetooth antenna for the BT Audio module.

2 POWER LED: Green for normal operation, blinking green for data transfer, red for protection mode.

3 POWER TERMINAL: Connect Ground and Battery cables.

4 REMOTE CONTROL: Connect optional remote for Master Volume, Bass Volume, and Mute function. Required if using ABT50 with OTG for iPhone.

5 REMOTE / SIGNAL TURN ON: Choose between ACC+/Remote wire or DC Offset signal for amp turn-on.

6 FUSE: Replace with a new fuse of the same value (30 A) if blown.

7 LINE OUT: Connect to the RCA input of another amplifier if using only the DSP function.

8 OPTICAL: For lossless Hi-Res audio transmission from smartphone via ABT50.

9 COAXIAL: Powers the ABT50 and receives audio data from it.

10 SPEAKER LEVEL INPUT/OUTPUT: Main connector for optional Plug & Play installation.

11 SUBWOOFER OUTPUT: Terminal for connecting a subwoofer with a minimum impedance of 2 ohms.

Wiring Diagram

The diagram shows the pinout for the 20-pin connector, detailing inputs like ACC-in, RR-in, RL-in, FL-in, FR-in, and outputs like Rem-out, FL+out, FL-out, FR+out, FR-out, RL+out, RL-out, RR+out, RR-out.

Note: For older car stereos, if the Auto-Turn-On function doesn't work, connect "ACC-IN" to ACC/Amp Remote or another +12V source. Then select "REMOTE TURN ON" on the remote switch.

Speaker Impedance & Power Wire Info

A642DSP: CH 1/2 and 3/4 at 4 ohm stereo | CH 5 at 4/2 ohm mono.

Amplifier Mounting

Attention: Disconnect the negative battery terminal before wiring.

• Select a secure mounting location, ensuring no fuel tanks, brake lines, or wiring harnesses are behind or below the mounting surface.
• Ensure at least 5cm clearance on all sides and the top for heatsink.
• Protect the unit from direct sunlight, humidity, water, and oil.
• Use the unit as a template to mark mounting holes. Drill pilot holes with a 2.5mm drill bit.
• Important: Do not directly contact the amplifier heatsink or bottom panel to the vehicle metal panel to avoid ground loops and audible hum.

Wire Routing

Main Power Wires: Use a minimum 16 mm² OFC copper or 20 mm² aluminum cable for +12V and ground wires. Run the +12V cable directly from the battery, installing a main fuse holder within the first 30 cm. Ensure the ground cable is as short as possible and has the same cross-section as the positive cable. The ground contact point must be clean and solid.

Optional Plug'N'Play Wire Harness: AXTON offers vehicle-specific or universal harnesses for easier installation. Ensure you know your headunit's security code before starting. Connect the harness to the amp and headunit, then reinstall the headunit.

Commissioning: Reconnect the battery ground terminal. The green status LED should illuminate. If not, or if the red "Protect" LED lights up, check all installation and wiring steps.

App Installation A642DSP

For Android phones: Find the current Android App on the A642DSP product page on www.axton.de. Install A642DSP_V1.0.apk. Do not pair in Bluetooth settings. Turn on Bluetooth and ensure Location is permitted. Open the A642DSP app and press "Connect".

For iOS phones: Go to the Apple AppStore, search for "A642DSP" and install the app. Turn on Bluetooth. Do not pair in Bluetooth settings. Open the app and press "Connect".

Download Links: QR codes are provided for downloading the app from the Apple AppStore or the Axton homepage.

Bluetooth Audio Streaming

Open smartphone Bluetooth settings, search for "BT Audio", press "connect", and enter code "1234". When playing music, the amplifier automatically mutes the car stereo signal. Note: You will not hear car stereo warnings or navigation audio during BT playback.

Functions

Connect to Smart Mobile: Start the app and press "Connect". The app downloads current settings.

Save to Phone: Save settings to your smartphone by pressing "Save on Phone", entering a filename, and confirming with "OK".

Save to AMP: Transfer settings to the amplifier by pressing "Save to Amplifier" and selecting a favorite slot. Do not switch off the amplifier during saving.

Load: Load saved setups from your smartphone. Press "Save to Amplifier" to permanently save the loaded setup.

Favorites: Press the star icon ★ to select one of five favorite presets.

EQ Settings

Adjust sound according to vehicle acoustics using 10-band or 31-band parametric EQ. Swipe left/right to access all bands. Adjust frequency (f0) and Q factor using pop-up windows or +/- buttons. The Q factor determines the bandwidth of the EQ filter.

Example 1: f0 = 1000 Hz, Q = 1 (bandwidth 1000 Hz)

Example 2: f0 = 1000 Hz, Q = 5 (bandwidth 200 Hz)

Q factors range from 0.3 to 9.9.

Independent EQ settings can be applied to front, rear, and subwoofer channels, or all channels together using the "ALL" button.

Press "Reset" to reset all settings to "0". To try presets without saving, exit the app without saving and restart it.

Dynamic Bass

The "Bass" slider in the EQ menu enhances bass performance without overloading speakers. Level 0 has no effect. Levels 1-20 increase bass and activate a subsonic filter to protect speakers from deep frequencies.

Gain Phase

Adjust sound level, mute, and phase for each channel. Use the icons above and below the speaker icons. Phase settings are adjusted via icons in the top line (left to right: Front Left, Front Right, Rear Left, Rear Right, Subwoofer). Mute settings are in the bottom line.

Save settings to the amplifier or smartphone.

Noise Gate

Located in the upper right corner of the GAIN menu, the Noise Gate function reduces background noise from the head unit. Increase the level by sliding left until noise is minimized.

Crossover

Assign frequency bands to speakers for their recommended operating range. Adjust high-pass filter (HPF) and low-pass filter (LPF) break frequencies and slopes. The blue line shows the filter slope. "Bypass" means the signal is unfiltered. Settings apply to preamp outputs as well.

Save settings to the amplifier or smartphone.

Time Alignment

Apply time delay to speaker signals to simulate an ideal listening position. Measure the distance from your listening position to each speaker. The furthest speaker serves as the reference (set to 0). Calculate delays for other speakers based on this reference.

Example Calculation:

• Listening position to Front Left (FL): 0.80 m
• Listening position to Front Right (FR): 1.40 m
• Listening position to Rear Left (RL): 0.50 m
• Listening position to Rear Right (RR): 1.30 m
• Listening position to Subwoofer (SubW): 2.00 m
• FL delay = SubW - FL = 2.00 - 0.80 = 1.20 m
• FR delay = SubW - FR = 2.00 - 1.40 = 0.60 m
• RL delay = SubW - RL = 2.00 - 0.50 = 1.50 m
• RR delay = SubW - RR = 2.00 - 1.30 = 0.70 m
• SubW delay remains 0.

Warranty Conditions + Limitations

AXTON's limited warranty covers products purchased from authorized dealers within the European Economic Area or Switzerland for 2 years from the original purchase date. It covers defects in material and workmanship for hardware components only, not software. Exclusions include normal wear and tear, misuse, unauthorized repairs, modifications, software viruses, liquid damage, accidents, extreme temperatures, and use outside specifications.

AXTON is not liable for indirect or consequential damages, loss of profits, data loss, or business interruptions. Liability is limited to the purchase price of the product.

To claim warranty, contact the authorized dealer with the original proof of purchase. Do not return products directly to AXTON. AXTON or its service partner will repair or replace defective products using new or refurbished components. The warranty holder is responsible for shipping costs and risks. A flat-rate investigation fee of €30.00 may apply if no warranty entitlement exists.

This warranty does not affect statutory or contractual rights.

Warranty Slip / Garantie-Karte

Fields for Model name, Date of purchase, Your name, address, city, ZIP/Postal Code, Country, and Your Dealer are provided for warranty registration.

Notice / Notizen

Declaration of Conformity for A642DSP with Directive 2014/53/EU is available at http://productip.com/?f=1f26e5.

Manufacturer: ACR Brändli + Voegeli AG, Bohrturmweg 1, CH-5330 Bad Zurzach, Switzerland.

EU Legal Representative: ACR S & V GmbH, Industriestr. 35, D-79787 Lauchringen, Germany.