The AURA AMH-79DSP is a versatile car audio receiver featuring DSP (Digital Sound Processor), Bluetooth, USB, and FM radio capabilities. Designed for a 12-volt electrical system with negative grounding, it offers a comprehensive suite of audio adjustments and connectivity options for an enhanced in-car listening experience.

Function Description

The AMH-79DSP serves as a central hub for in-car entertainment and audio control. Its primary functions include:

Audio Playback: Supports various sources including FM radio, USB media (FLAC, WAV, APE, AAC, MP3 formats), Bluetooth audio streaming (A2DP), and an AUX input.
Digital Sound Processing (DSP): Offers advanced audio customization with a 24-band equalizer, crossover settings (2-WAY or 3-WAY modes), time alignment (DTA), bass boost, and loudness control.
Bluetooth Connectivity: Enables hands-free calling (HFP) and audio streaming (A2DP) from mobile devices. Features include phone pairing, outgoing/incoming call management, last dialed number recall, Siri activation, and switching between phone and speakerphone audio.
USB Port: Allows playback from USB storage devices (up to 64 GB, FAT16/FAT32 file systems) and supports charging mobile devices.
Radio Tuner: Provides FM (87.5-108.0 MHz), VHF (65-74 MHz), and AM (522-1620 kHz) reception with automatic and manual station search, local seek, stereo/mono settings, and RDS (Radio Data System) features like text messaging, traffic announcements (TA), alternative frequencies (AF), enhanced other networks (EON), radio text, and program type (PTY) search.
User Interface: Features an LCD display, a rotary volume control, and a set of buttons for navigation, source selection, track control, and menu access. An IR receiver allows control via the included remote.
Steering Wheel Control (SWC): Programmable to integrate with resistive steering wheel control buttons, offering convenient operation without taking hands off the wheel.
Mobile App Control: Most device settings can be controlled via the AURA Audio mobile app available for Android and iOS, connecting via Bluetooth.
System Settings: Includes options for button sound (beep), AUX input enable/disable, car ACC ignition lock type, display animation, demo mode, factory reset, and software version display.

Important Technical Specifications

Power Output: Maximum 4 x 51 W (4 ohms), Rated 4 x 16 W (4 ohms).
Operating Voltage: 12 V (allowable limits 9.6 - 15 V).
Fuse: 15 A.
Speaker Impedance: 4-8 ohm.
Frequency Response: 20 Hz - 20 kHz.
RCA Output: 6-channel (3 pairs), up to 3.5 V.
USB Support: USB 2.0 / 3.0, up to 64 Gb, FAT16/FAT32 file systems.
Bluetooth Version: 4.2.
Bluetooth Profiles: A2DP, AVRCP, HFP.
Bluetooth Frequency: 2.4 GHz.
Radio Tuning Memory: 18 FM, 12 AM.
DSP Equalizer: 24 bands, 45-20000 Hz, Gain -9dB to +9dB (0.1dB step).
DSP Time Delays: 0-25ms, 0-850cm.
Dimensions (W x D x H): 182 x 108 x 53 mm.
Operating Temperature: 0°C to +60°C.
Humidity: 45% to 80%.
Overheat Protection: 90°/100°/110°.

Usage Features

DSP Settings: The device offers extensive DSP capabilities. Users can select between 2-WAY (regular) and 3-WAY (network) crossover configurations, each with specific settings for tweeters, mid-range speakers, and subwoofers. This includes frequency selection (FRQ), slope (SLOPE), phase (PHASE), and gain (GAIN) adjustments. The 24-band equalizer allows fine-tuning of audio frequencies. Time alignment (DTA) enables per-channel delay settings, crucial for optimizing sound staging based on speaker distances. Presets like Natural, Rock, Pop, Easy, Top 40, JAZZ, and Powerfull are available for quick EQ changes.
Saving DSP Presets: Up to 6 independent DSP settings (EQ, delay, crossover) can be saved and quickly recalled using the preset buttons. This is particularly useful for different music genres or listening preferences.
Volume Control: A rotary knob controls the volume, and a volume limit can be set (3-40 units) to prevent excessively loud playback. The "Power on vol." setting allows defining the initial volume level when the receiver is turned on.
Source Selection: Easily switch between Radio, USB, AUX, and Bluetooth sources using the SRC button.
Radio Operations: Automatic search and storage of stations (AMS) can store 18 FM and 12 AM stations. Manual tuning is also available. RDS features provide additional information and functionality where supported.
USB Playback: Supports various audio formats. Users can switch tracks, rewind/fast forward, play/pause, scan tracks (10 seconds per track), and choose repeat modes (folder, one, all) or random play.
Bluetooth Hands-Free: After pairing with a mobile device (PIN: 1234), the receiver supports hands-free calls, displaying caller ID, and allowing call reception, rejection, and ending. It also enables calling the last dialed number and activating voice assistants like Siri.
Steering Wheel Control Programming: For cars with resistive SWC buttons, the device can be programmed to map functions to these buttons. This involves entering the SWC menu, enabling the function, and then assigning head unit functions to the steering wheel buttons.
Display Customization: Users can select the RGB backlight color, enable/disable the frequency spectrum display, and configure dimmer settings (on/off, timer).
Software Updates: Firmware updates are available to improve performance and add new features, accessible via the manufacturer's website.

Maintenance Features

Cleaning: Use only a dry, soft fabric to clean plastic parts and the display. Avoid alcohol, solvents, or gasoline.
Battery Replacement (Remote Control): The remote control uses a CR-2025 lithium battery. Instructions are provided for safely replacing the battery, emphasizing correct polarity.
Factory Reset: A dedicated RST button allows resetting the device to its factory settings, which can be useful for troubleshooting or clearing all custom configurations.
Overheat Protection: The device includes overheat protection, automatically adjusting operation at 90°, 100°, and 110° Celsius to prevent damage.
Installation Precautions: Proper installation is crucial for device longevity and safety. This includes avoiding high temperatures, humidity, and dust, ensuring secure mounting, and connecting to a 12-volt negative grounding system. Incorrect wiring, especially for the ACC line, can lead to unstable operation or damage.
Warranty: The device comes with a 3-year service life and a 1-year warranty from the date of sale, covering defects due to materials or workmanship. The warranty is voided by water damage, incorrect installation, unauthorized modifications, or an incomplete/missing warranty card. Parts with limited life (batteries, fuses) are not covered.

Aura AMH-79DSP - Warranty Coupon

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