1. はじめに
The NVX XDSP28 is an advanced 8-channel Digital Signal Processor (DSP) designed to enhance your car audio system. It features a 15-band parametric equalizer, adjustable high and low-pass filters, and various crossover types for precise sound customization. With 2 RCA inputs and 8 RCA outputs, built-in Bluetooth for audio streaming, and a remote level controller, the XDSP28 provides comprehensive control over your vehicle's sound environment. This manual provides detailed instructions for installation, operation, and troubleshooting to ensure optimal performance of your device.
2. 安全情報
- インストールおよび使用する前に、すべての指示をよくお読みください。
- Disconnect the vehicle's negative battery terminal before making any electrical connections.
- 電気的危険を防ぐために適切な接地を確保してください。
- ユニットを湿気や極端な温度にさらさないでください。
- 車両の運転中に動かないようにユニットをしっかりと取り付けます。
- インストール手順が不明な場合は、プロのカーオーディオインストーラーにご相談ください。
3. パッケージ内容
パッケージにすべてのアイテムが揃っていることを確認します。
- NVX XDSP28 Digital Signal Processor Unit
- Remote Level Controller with Cable
- ユーザーマニュアル
- 取り付け金具（ネジなど）
4.製品オーバーview
Familiarize yourself with the components and controls of the NVX XDSP28.
Figure 4.1: NVX XDSP28 Front Panel with Labeled Components
- Remote Out Sequencer: Activates other devices in sequence through a remote connection.
- リモート入力 (REM IN): 回転する amplifier on automatically with the radio or player.
- Ground Connector (GND): Connect to the battery's negative terminal.
- Positive Power Connector (+BAT): Connect to the battery's positive terminal.
- LCDディスプレイ: Displays information and allows interaction with the processor.
- メインコントロール: A rotating knob to adjust processor system settings and navigate menus.
- Input LED Indicator: Shows when the channel's limiter is active or output is saturated.
- Remote Level Input: Connects the external remote level controller. Controls all eight outputs simultaneously.
- Audio Input (Inputs A, B): Independent RCA connectors for channels A and B.
- Audio Output (Outputs 1-8): RCA connectors for outputting processed audio.
- 出力LEDインジケーター： Signals when the input signal is at maximum level.
- 出力選択: Quickly press to adjust output channels or hold to mute.
図4.2：上 view of the NVX XDSP28 unit, showing the main control knob, LCD display, and input/output connections.
図4.3：背面 view of the NVX XDSP28, highlighting the power and remote connections.
Figure 4.4: The remote level controller for the NVX XDSP28, used for simultaneous output control.
5. セットアップとインストール
最適なパフォーマンスを得るには、適切なインストールが不可欠です。以下の手順を慎重に実行してください。
- 取り付け: Select a secure, dry location in your vehicle, away from heat sources and moisture. Use the provided mounting hardware to firmly attach the DSP unit.
- 電源接続：
- 接続する +バット terminal to the vehicle's positive battery terminal (or a constant 12V source) using appropriate gauge wire and an inline fuse (not included).
- 接続する グランド terminal to a clean, unpainted metal surface on the vehicle chassis, ensuring a solid ground connection.
- 接続する レムイン terminal to the remote turn-on output of your head unit or ignition switch.
- オーディオ入力接続: ヘッドユニットのRCA出力を Inputs A そして B on the XDSP28.
- オーディオ出力接続： 接続する 出力1〜8 of the XDSP28 to the RCA inputs of your amplifiers. Ensure correct channel assignment for your speaker configuration.
- Remote Level Controller: Plug the remote level controller cable into the リモート port on the DSP unit. Mount the controller in an accessible location for easy adjustment.
- 初期パワーアップ: Reconnect the vehicle's negative battery terminal. The DSP should power on, and the LCD display will illuminate.
6. 操作
The NVX XDSP28 offers extensive control over your audio system. All settings are adjusted via the Main Control knob and the LCD display.
6.1メニューナビゲーション
- 回転する 主制御 knob to scroll through menu options.
- を押す 主制御 knob to select an option or confirm a setting.
- を押し続けます 主制御 knob to exit a menu or return to the previous screen.
6.2 イコライゼーション（EQ）
The XDSP28 features a 15-band parametric equalizer for precise frequency adjustments.
- Graphic EQ Presets: Select from 12 pre-defined graphic equalization presets such as Rock, Hip Hop, Pop, Vocal, and more.
- パラメトリックEQ： Manually adjust gain, frequency, and Q-factor for each of the 15 bands on both input and output channels.
6.3 Crossover Function
Configure high-pass and low-pass filters for each output channel to optimize speaker performance.
- Adjust cut frequencies for high-pass and low-pass filters.
- Select various crossover types and filter slopes (e.g., Butterworth, Linkwitz-Riley).
6.4 Time Alignment and Phase
Achieve perfect sound staging by adjusting the delay for each output channel.
- Adjust time delays in 0.02 ms increments.
- Set phase adjustments to 0° or 180° for each output.
6.5 Independent Gain and Limiter
- Independent Gain: Adjust the gain level for each output channel individually.
- リミッタ： The integrated Limiter with Dynamic Attack-Release system protects your amplifiers and speakers from over-excursion and clipping.
6.6 オーディオジェネレータ
Utilize the built-in audio tone generator for precise tuning and system diagnostics.
- Generate frequency sweeps.
- Generate pink noise for RTA (Real-Time Analyzer) measurements.
6.7 Bluetooth接続
The XDSP28 features built-in Bluetooth for wireless audio streaming from your mobile device.
- Pair your device with the XDSP28 via Bluetooth settings on your phone.
- Bluetooth is for audio playback only; it does not support app-based control of DSP settings.
6.8 Remote Level Controller
The external remote level controller allows for convenient, simultaneous adjustment of all eight output levels.
7. メンテナンス
- Keep the unit clean and free of dust. Use a soft, dry cloth for cleaning.
- 強力な化学薬品や研磨剤入りの洗剤の使用は避けてください。
- Ensure all connections remain secure. Periodically check wiring for any signs of wear or damage.
8。 トラブルシューティング
| 問題 | 考えられる原因 | 解決 |
|---|---|---|
| No power to the DSP. | Incorrect power wiring; Blown fuse; Loose ground connection. | Check +BAT, GND, and REM IN connections. Verify fuse integrity. Ensure a solid ground connection. |
| 音声出力がありません。 | Incorrect input/output connections; DSP muted; Amplifier not powered on; Incorrect source selection. | Verify all RCA connections. Check DSP mute status (Output Select button). Ensure amplifiers are receiving remote turn-on signal. Confirm correct input source (A, B, or A+B). |
| 音質が歪んだり悪かったりする。 | Incorrect EQ settings; Improper crossover settings; Input signal too high/low; Limiter engaged excessively. | Adjust EQ settings. Review crossover frequencies and slopes. Check input gain levels. Monitor Input LED indicators for clipping. |
| Bluetooth接続の問題。 | デバイスがペアリング モードではありません。干渉が発生しています。すでに別のデバイスに接続されています。 | Ensure Bluetooth is enabled on your device and the DSP. Disconnect from other Bluetooth devices. Move closer to the DSP. |
| Main Control knob is overly sensitive. | Characteristic of the control mechanism. | Exercise caution and precision when rotating and pressing the knob for menu navigation and setting adjustments. |
| Remote Level Controller causes input glitches. | Potential unit-specific issue or interference. | Ensure the remote cable is securely connected and not damaged. If issues persist, try operating without the remote controller to isolate the problem. Contact support if necessary. |
9. 仕様
| 特徴 | 仕様 |
|---|---|
| モデル | NVX XDSP28 |
| チャンネル数 | 8 (出力) |
| 入力チャンネル | 2RCA |
| 出力チャンネル | 8 RCA (up to 2 Volts output) |
| イコライザ | 15バンドパラメトリックEQ |
| 信号対ノイズ比 | > 94dB |
| 全高調波歪み（THD） | 0.01% |
| Time Adjustment Increments | 0.02ミリ秒 |
| 位相調整 | 0°または180° |
| Graphic EQ Presets | 12 (Rock, Hip Hop, Pop, Vocal, etc.) |
| 最小供給量tage | 10 ボルト (DC) |
| 最大供給量tage | 16 ボルト (DC) |
| 寸法（長さ×幅×高さ） | 7.87インチ x 3.98インチ x 1.46インチ (200mm x 101mm x 37mm) |
| アイテム重量 | 0.7キログラム |
| ブルートゥース | Built-in (for audio streaming) |
| Remote Level Controller | Included, for simultaneous output control |
10. 保証とサポート
NVX products are designed for reliability and performance. For specific warranty details, please refer to the warranty card included with your product or contact the retailer where the product was purchased. Keep your proof of purchase for warranty claims.
For technical assistance, troubleshooting beyond this manual, or service inquiries, please contact NVX customer support or the authorized dealer. Contact information can typically be found on the manufacturer's official webサイトまたは小売店を通じてご購入いただけます。