1. Produk Lebihview
The TOPPING A70 Pro is a high-performance fully balanced headphone amppenguat dan praamplifier designed for superior audio reproduction. It incorporates advanced circuit architecture and user-friendly features to enhance your listening experience.
Imej 1.1: Depan view of the TOPPING A70 Pro, showcasing its display and controls.
Ciri-ciri Utama:
- Optimized Circuit Architecture: Features an optimized circuit architecture with a newly developed ultra-low noise input stage, improving balanced input noise performance and increasing input impedance to 20kΩ for enhanced compatibility. The revised gain architecture further reduces noise and distortion at high gain settings.
- Ground Loop Noise Elimination: Includes a GND/LIFT switch to eliminate ground loop noise when multiple devices are connected. If ground loop noise occurs, switch to LIFT to resolve it.
- Aurora UI: The Aurora UI provides a new user experience with a full-color screen and three touch buttons. Users can switch between playback information, FFT, and VU meter displays.
- Relay Volume Control: Equipped with a relay-based R2R volume control module, ensuring precise and consistent volume adjustment with long-term reliability, even at low levels.
- Fon kepala Amplebih hidup dan PraampFungsi lifier: Berfungsi sebagai fon kepala yang berkuasa amppengalir dan pra-prestasi tinggiamplifier. It features low output impedance (RCA: 500Ω, XLR: 100Ω) for broad compatibility with various power amplifiers. A comprehensive remote control is included for convenient operation.
Imej 1.2: Selesaiview of the A70 Pro's core features and performance metrics.
2. Persediaan
2.1 Membongkar dan Pemeriksaan
Carefully remove the A70 Pro from its packaging. Inspect the unit for any signs of damage. Ensure all accessories, including the power cable and remote control, are present.
2.2 Menyambung ke Kuasa
Connect the provided power cable to the IEC power AC connection on the rear panel of the A70 Pro and then to a suitable AC power outlet. The unit can be powered on via the soft start button on the front or with the included remote control.
2.3 Sambungan Audio
The A70 Pro offers various input and output options:
- Input: One set of balanced XLR inputs and one set of single-ended RCA inputs are available on the rear panel.
- Outputs (Headphone): The front panel features 4-pin XLR, 4.4mm Pentacon, and 6.3mm headphone output connections.
- Outputs (Preamplebih hidup): Balanced XLR and single-ended RCA outputs are located on the rear panel for connecting to power amppenghidup atau pembesar suara aktif.
Image 2.1: Typical connection setup: PC to DAC, DAC to A70 Pro, and A70 Pro to headphones.
2.4 Optional Expansion (EXT90)
The A70 Pro supports input expansion with the optional EXT90 module (sold separately). Connecting the EXT90 provides additional balanced XLR and single-ended RCA inputs, expanding the total to four balanced XLR and two single-ended RCA inputs.
Image 2.2: The A70 Pro connected to the optional EXT90 expansion module for additional inputs.
3. Arahan Operasi
3.1 Hidupkan/Mati Kuasa
Press the power button on the front panel or the remote control to turn the unit on or off. The display will illuminate upon power-up.
3.2 Kawalan Kelantangan
The A70 Pro features a precise relay-based R2R volume control. Adjust the volume using the rotary knob on the front panel or the volume up/down buttons on the remote control. The current volume level is displayed on the screen.
Image 3.1: The display showing the current volume level and gain setting.
The A70 Pro can memorize up to 8 separate volume settings. It automatically reverts to the last used volume for each output selection.
3.3 Navigasi UI Aurora
The full-color display and three touch buttons provide intuitive control. Use the touch buttons to navigate menus and select options. The display offers various modes, including playback information, FFT (Fast Fourier Transform), and VU (Volume Unit) meter displays, which can be switched according to user preference.
3.4 Tetapan Gain
The A70 Pro features two gain settings (Low and High) to accommodate a wide range of headphones and audio sources. Adjust the gain setting via the menu or remote control to match your headphones' sensitivity and achieve optimal sound quality without distortion.
3.5 Pemilihan Input
Select the desired audio input (XLR or RCA) using the input selector on the front panel or the remote control. The active input will be indicated on the display.
4. Penyelenggaraan
4.1 Pembersihan
To clean the unit, use a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as they may damage the finish or internal components.
4.2 Penyimpanan
When not in use for extended periods, store the A70 Pro in a cool, dry place away from direct sunlight and extreme temperatures.
5. Penyelesaian masalah
5.1 Tiada Bunyi
- Ensure the unit is powered on and the volume is not set to minimum or muted.
- Sahkan bahawa sumber input yang betul dipilih.
- Periksa semua kabel audio untuk sambungan selamat.
- Confirm that your headphones or connected power amppenghawa dingin berfungsi dengan betul.
5.2 Ground Loop Noise
If you experience humming or buzzing sounds, especially when multiple devices are connected, it may be due to a ground loop. The A70 Pro is equipped with a GND/LIFT switch on the rear panel to address this.
- Cari GND/LIFT switch on the rear panel.
- If noise is present, switch the setting to ANGKAT. This can help break the ground loop and eliminate the noise.
Image 5.1: Rear panel detail showing the GND/LIFT switch for ground loop noise reduction.
6. Spesifikasi
| Ciri | Perincian |
|---|---|
| Jenama | Topping |
| Nombor Model | A70 Pro |
| warna | Perak |
| Output Power (SE IN/SE OUT, BAL IN/SE OUT) |
|
| Output Power (SE IN/BAL OUT, BAL IN/BAL OUT) |
|
| Impedans Beban | >8Ω |
| THD+N | <0.00005% @500mW 32Ω (1kHz A-wt) |
| Tahap Kebisingan | <0.2uVrms @G=L, <0.8uVrms @G=H |
| Julat Dinamik | 147dB (overall), 106.3dB @50mV output |
| Impedans Input (Seimbang) | 20kΩ |
| Praamplifier Output Impedance (RCA) | 500Ω |
| Praamplifier Output Impedance (XLR) | 100Ω |
| Dimensi Pakej | 37.01 x 24 x 8.89 cm |
| Berat badan | 2.18 kg |
| Tarikh Tersedia Pertama | 2023/05/15 |
Image 6.1: Comparison of A70 Pro's low noise performance.
Imej 6.2: Dalaman view highlighting the T'ang-ku-la Module, a key component for performance.
7. Waranti dan Sokongan
For warranty information and technical support, please refer to the documentation included with your product or contact the manufacturer directly. Keep your purchase receipt as proof of purchase for warranty claims.