Nakamichi FDSK730A DIGITAL SOUND PROCESSOR User Manual
Product Features
- High-resolution digital sound processor for automotive audio systems.
- Advanced Digital Signal Processing (DSP) engine for precise audio tuning.
- Integrated Bluetooth connectivity for wireless audio streaming.
- Control via dedicated mobile application (iOS and Android) and PC software.
- Multiple input options including RCA, Speaker Level, and Optical.
- Delivers high-quality audio output for enhanced listening experience.
- Comprehensive tuning capabilities: Graphic Equalizer, Parametric Equalizer, Crossover, Time Alignment.
Characteristics (Specifications)
| Parameter | Specification |
|---|---|
| Dimensions | 170mm (W) x 120mm (D) x 45mm (H) |
| Weight | Approx. 0.8 kg |
| Power Supply | 10.5V - 16V DC |
| Power Consumption | Max 500mA |
| Signal-to-Noise Ratio (RCA Input) | >110dB |
| THD (RCA Input) | <0.005% |
| Frequency Response (RCA Input) | 10Hz - 22kHz |
| Input Voltage (High Level) | 4V - 16V |
| Input Voltage (Low Level/RCA) | 2V - 5V |
| Output Voltage (RCA) | Max 5V |
| DSP Processor | 32-bit Floating Point DSP |
| Sampling Rate | 192kHz / 24bit |
| Bluetooth Version | 5.0 |
System Overview and Wiring
The FDSK730A acts as the central hub for your car audio system, processing audio signals before they reach the amplifier. It connects to the vehicle's power system and receives audio inputs from the head unit or other sources.
System Matching Diagram Description
The system diagram illustrates the connectivity flow: The FDSK730A receives audio signals from the car's head unit via speaker-level inputs or RCA inputs. It can also accept digital audio via an optical connection. Power is supplied through a dedicated 12V DC connection, requiring positive, ground, and remote turn-on signals. The processed audio is then sent from the FDSK730A's RCA outputs to an external amplifier, which powers the car's speakers. A USB port is available for connecting to a computer for software-based configuration and tuning.
Wiring Diagram Description
The rear panel of the FDSK730A features clearly labeled terminals for essential connections:
- POWER: Connects to the vehicle's 12V battery positive terminal. An appropriate inline fuse is recommended.
- GND: Connects to a clean, unpainted metal point on the vehicle's chassis for grounding.
- REM: Receives the remote turn-on signal from the head unit to power the DSP and connected amplifiers on/off.
- SPEAKER IN (L/R): High-level inputs designed to accept audio signals directly from the car's head unit speaker outputs.
- RCA OUT (L/R): Low-level analog outputs used to send the processed audio signal to the input of an external amplifier.
- OPTICAL IN: A digital audio input port for sources that provide an optical output.
- USB: A Type-B USB port for connecting the device to a computer for software control and firmware updates.
Installation Guide
High-Level Installation Steps
- Power Connection: Connect the POWER terminal to the vehicle's positive battery terminal, ensuring an appropriate fuse is installed. Connect the GND terminal securely to the vehicle's chassis. Connect the REM terminal to the remote turn-on output of the head unit.
- Signal Input Connection: Connect the speaker outputs from the car's head unit to the FDSK730A's SPEAKER IN terminals. If the head unit provides pre-amplified RCA outputs, these can be connected to the unit's RCA inputs (if applicable, otherwise speaker-level is primary). For digital sources, connect the optical output to the OPTICAL IN port.
- Signal Output Connection: Connect the RCA OUT terminals of the FDSK730A to the corresponding RCA inputs on your car amplifier(s).
- PC Software Connection: For initial setup and advanced tuning, connect the FDSK730A to a computer using a USB cable via the USB port.
- Final Check: Before powering on the system, double-check all wiring connections for security and correct polarity.
Operation and Control
Basic Operations
Upon powering the vehicle and the FDSK730A, the unit is ready for configuration. Control can be managed through either the mobile application or the PC software.
Bluetooth Music Playback
To stream music wirelessly:
- Select "Bluetooth" as the audio source on the FDSK730A via its control app or software.
- On your smartphone or tablet, enable Bluetooth and scan for available devices.
- Select "Nakamichi FDSK730A" from the list and initiate pairing.
- Once paired, any audio played on your mobile device will be transmitted to the FDSK730A. The mobile app provides playback controls such as play/pause, track skipping, and volume adjustment.
External Device Playback
For devices connected via analog or digital inputs:
- Select the appropriate input source (e.g., "Analog In" for RCA, "Optical In" for digital) using the control app or software.
- Playback and control are managed directly by the connected external device.
Operation of Mobile Phone App
The Nakamichi mobile application offers comprehensive control over the FDSK730A's audio settings:
- Source Selection: Easily switch between Bluetooth, Optical, Analog (RCA), or Speaker Level inputs.
- Volume Control: Adjust the master volume level for the entire system.
- Equalizer (EQ):
- Graphic EQ: Features multiple frequency bands (e.g., 31.5Hz to 16kHz) allowing gain adjustment for each band. A visual graph displays the resulting frequency response curve.
- Parametric EQ: Provides precise control over audio frequencies by allowing adjustment of center frequency, gain, and Q-factor (bandwidth) for each band.
- Crossover: Configure high-pass and low-pass filters for various speaker outputs (front, rear, subwoofer). Adjustments include cutoff frequency and filter slope (e.g., 6dB/octave, 12dB/octave, 24dB/octave).
- Time Alignment: Compensate for varying distances of speakers from the listening position by adjusting the delay for each channel, ensuring sound arrives simultaneously for improved imaging.
- Subwoofer Control: Manage subwoofer output level, phase (0° or 180°), and its dedicated crossover settings.
- Output Configuration: Route input signals and apply DSP settings to specific output channels.
- Presets: Save and recall custom audio tuning configurations for different music genres or listening preferences.
The app interface provides visual feedback on all adjustments, making it easy to fine-tune the audio system.
PC Software Operations
For advanced tuning and configuration, Nakamichi provides dedicated PC software accessible via a USB connection.
PC Software Download
The necessary software can be downloaded from the Nakamichi website. A QR code is provided in the original documentation to facilitate this download.
Basic Operations of Computer
Connect the FDSK730A to your computer using a USB cable. Launch the Nakamichi PC software. The software interface is designed to provide detailed control and visualization of all audio parameters.
Computer Software Operations
The PC software offers comprehensive control over the FDSK730A, including:
- Input/Output Routing: Flexible assignment of audio sources to output channels.
- Advanced EQ Control: Granular adjustments for both graphic and parametric equalizers, often with more bands or finer resolution than the mobile app.
- Crossover Networks: Detailed configuration of filter types, frequencies, and slopes for all outputs.
- Time Alignment: Precise delay settings for each channel, often with visual aids.
- Level and Phase Control: Fine-tuning of output levels and speaker phase alignment.
- System Diagnostics: Potential features for checking device status or firmware information.
- Saving/Loading Configurations: Ability to store multiple tuning profiles and load them as needed.
Precautions
Please observe the following precautions for safe and optimal operation:
- Polarity: Always ensure correct polarity when connecting power and ground terminals to prevent damage to the unit and vehicle electronics.
- Power Disconnection: Disconnect the vehicle's battery before commencing any wiring or installation work.
- Fusing: Use an appropriately rated fuse on the main power connection to protect the device and vehicle wiring from overcurrent.
- Secure Connections: Ensure all electrical connections are tight, secure, and properly insulated to prevent short circuits and ensure reliable performance.
- Environmental Conditions: Avoid exposing the FDSK730A to excessive moisture, dust, or extreme temperatures, as this can affect its performance and longevity.
Simple Cable Handling
For the best audio performance, it is recommended to use high-quality, shielded cables for all audio connections (RCA, speaker wires). Route cables away from potential sources of electromagnetic interference, such as power cables or ignition systems. Securely manage all wiring using zip ties or cable looms to maintain a tidy installation and prevent damage from vibration or movement.
