Nakamichi NDSK4085AU Digital Sound Processor User Manual
User Manual
Product Overview
The Nakamichi NDSK4085AU is a Digital Sound Processor designed for car audio systems, offering advanced audio tuning capabilities.
The device is a compact black rectangular unit with a Nakamichi logo. Its rear panel features various input and output connectors, including PC, USB, AUX, and speaker channels, along with power and remote terminals.
Notice
- To prevent the risk of short circuits, keep the device away from water, liquid, and wet areas.
- If water or any other liquid enters the device, cut off power immediately and contact the nearest service center for inspection.
- There are no user-serviceable parts inside the device; contact the nearest service center for any repairs or servicing.
- The surface temperature of the device can exceed 80 degrees Celsius under prolonged loads; install the device in a safe location.
Troubleshooting
Please ensure that all cables are securely connected to the corresponding ports before turning on the power.
Common troubleshooting procedures are listed below:
If a fault occurs, follow the instructions below for commonly encountered problems. If issues persist after following suggestions, please reset the unit to factory settings. If issues persist after factory reset, please contact the nearest service center.
| No. | Malfunction | Reason and Solution |
|---|---|---|
| 1 | No Power | A. Check the power connection B. Check the ACC connection |
| 2 | No Sound | A. Is it in mute mode B. Have you selected the correct input channel |
| 3 | Unable to connect USB | A. Check the USB connection B. Check if the driver "HID-compliant device" has been installed in your PC |
Accessory List
- 1. Amplifier (1pc)
- 2. User Manual (2pcs)
- 3. USB2.0 Cable (1.5m) (1pc)
- 4. Installation Bracket (2pcs)
- 5. Self-Tapping Oval Head Screws (4x20mm) (2pcs)
- 6. Cross Head Mechanical Screws (3x8mm) (4pcs)
- 7. Velcro (2sets)
Product Technology Data
Product Data
| Dynamic Range (RCA Input) | ≥100dB |
| S/N (RCA Input) | 0~22dB |
| Frequency Response | 20Hz~20KHz |
| Input Impedance | High Level Input: 240Ω |
| Low level Output Impedance | ≤100Ω |
| Signal Input | RCA Input: 8Vpp; High Level: 26Vpp |
| Output Range | RCA Output: 12Vpp; Amplifier: 4x80W |
| Working Temperature | -20~70°C |
| Power | DC9V-16V |
| REM Input | High Level Input Signal: FL+/FL- or ACC control cable |
| REM Output | +12V Startup Voltage Output |
| Standby Power | ≤0.1W |
| Gross Weight | Approx. 0.7kg |
| Box Dimension (LxHxW) | 174.5x120x40mm |
All specifications subject to change without notice.
Technical Sheet
| Input Signal Type | 4 Channels high level, supports internal Bluetooth and USB music playback. |
| Output Type | 8 Channels low level, 4Channels 80W power |
| Output Gain | Gain range: Mute, -59dB~6dB |
| Output Signal EQ | 31-band EQ for every channel. 1. Frequency Range: 20Hz~20KHz, 1Hz Accuracy 2. Q value (Slope): 0.404~28.85 3. Gain: -20.0dB~+20.0dB, 0.1dB Accuracy |
| Output Signal Crossover | Equipped with high and low pass filters. 1. Professional filter type: Butter-w, Bessel, Link-Ril 2. Filter Crossover Point: 20Hz~20kHz, Resolution 1Hz 3. Filter Slope Setup: 6dB/Oct~48dB/Ovt |
| Output Phase and Time Alignment | Adjust phase and time alignment for every output channel: In Phase or Out Phase (0°-180°); Time Alignment: 0.000 to 20.000 milliseconds, 0 to 692 cm, 0 to 273 inches. |
| Presets | Save 6 presets into the device. |
Dimensions
The device dimensions are 174.5 mm (length) x 120 mm (width) x 40 mm (height).
The rear panel layout shows connection ports labeled:
- PC Port (USB Type-B)
- USB Port (Type-A)
- AUX-L (RCA Input)
- AUX-R (RCA Input)
- OUTPUT CH8, CH6, CH4, CH2 (RCA Output)
- HIGH/ACC Terminal Block
- NDSK4085AU Model Name
- POWER Terminal
- REM Terminal
- Input/Output terminals for CH7, CH5, CH3, CH1
The diagram also illustrates the installation of mounting brackets using screws.
Panel Controls and Features
The rear panel of the Nakamichi NDSK4085AU features the following ports and controls:
- A. PC Port: Connect to computer tuning software. Driver installation is automatic.
- B. USB Port: Insert a USB drive to play music.
- C. AUX LOW LEVEL INPUT PORT: Low-level RCA inputs for left and right speakers.
- D. AUX LOW LEVEL OUTPUT PORT: Low-level RCA outputs for up to 6 channels of speaker output.
- E. POWER INDICATOR LIGHT: Indicates power status.
- F. MACHINE START MODE SWITCH: Select between ACC (Accessory) or HOST (High Level Input Signal) for machine startup.
- G. HIGH LEVEL INPUT AND OUTPUT PORT: Terminals for high-level signals, including FL+/FL-, FR+/FR-, RL+/RL-, RR+/RR-, GND, +12V, REM, and ACC. The manual specifies polarity: "+" is positive, "-" is negative/ground. It also notes that using the original car's special wire or user-defined wiring material is recommended. It emphasizes confirming power supply requirements before connecting to prevent damage or accidents.
Software Introduction
PC Software Operation
The PC software can be downloaded from the official website (http://www.nakamichicaraudio.com, Downloads). Computer configuration requirements include a screen resolution higher than 1280 x 768 for complete UI display, compatible with Windows operating systems.
Main Features: Memory, option, mixing, audio, and input source selection.
- Memory: Load or save machine preset scenarios and scene files.
- Options: Switch between Chinese and English, configure noise gate, view "About" information, and restore factory settings.
Interface Elements:
- EQ PASS Section: Features a 31-band graphic equalizer (GEQ) with adjustable frequency, Q value, and gain. Includes High-pass and Low-pass filter settings (Type, Frequency, Octave/Slope). Buttons for Reset EQ and Restore EQ are available.
- Volume Sliders: Individual volume controls for CH1 through CH8.
- Output Controls: Reset Output, Link Output, Locked Output, and Delay Unit settings (Ms, Cm, Inch).
- Main Menu Edit Section: Allows selection of input sources (Analog, BT, USB), memory presets, and options.
Mixer Interface: Allows mixing of input sources (Analog 1-4) to output channels (OutCh1-OutCh8).
Channel Equalizer Editing Area: Detailed control over each channel's EQ, including frequency, Q value, and gain adjustments. Offers options for reset and restore equalization.
Channel Divider Editing Area: Setup for High & Low Pass Filters, with adjustable Filter Type, Frequency point, and Q Value (Slope).
Output Channel Adjustment Area: Controls for phase (0°/180°), volume, mute, joint adjustment, and delay for each output channel.
Main Volume Adjust Zone: Controls main volume and subwoofer volume, with mute functionality.
Smartphone Software Operation (APP)
The smartphone app can be downloaded from the official website (http://www.nakamichicaraudio.com, Downloads).
Main Interface:
- Displays connection status (Black: not connected, Red: connected).
- Allows saving and recalling up to 6 preset scenes.
- Provides audio source selection: Bluetooth, Analog, USB.
- Volume adjustment for main, subwoofer, medium, high, and low frequencies.
- Access to Menu for output channel adjustment, Equalizer, mixing mode, system settings, and music playback.
Channel Interface:
- Channel selection, volume mute, phase adjustment (forward/reverse), high/low pass filter settings, and joint tuning.
- Delay unit switching (milliseconds, centimeters, inches).
- Output channel selection (8 channels available).
- Channel type selection (front audio, rear audio, center audio, subwoofer audio).
- Individual channel volume adjustment.
- Delay setting adjustment.
- Mute function.
- Channel phase switching.
- Channel joint debugging settings.
Mixer Interface: Allows mixing of Bluetooth/USB and analog sources with adjustment range 0~100.
EQ Interface: Corresponds to output channel EQ curve adjustments (gain, Q value, frequency). Includes reset, pass-through, and parametric equalization settings. The EQ display area shows a 31-band equalizer. Options for HPF and LPF adjustment with various filter types and slope selections are available.
Music Interface: When connected via USB, Bluetooth, or Level-H, users can select music for playback (play, pause, next, previous, loop, random, single play). Playback source selection and playlist management are supported. Music adjustment controls include play/pause, next/previous song, and loop mode selection.
System Interface: Allows restoring factory settings, configuring noise gate, mode settings, and checking machine model/version.
