Introducció
Gràcies per la compraasing the S.M.S.L H400 Headphone Amplifier & Preamplifier. This manual provides essential information for the proper setup, operation, and maintenance of your device. Please read it thoroughly before use to ensure optimal performance and longevity.
Què hi ha a la caixa
- S.M.S.L H400 Headphone Amplifier & Preamplificador x 1
- Control remot x 1
- Cable d'alimentació x 1
- Manual d'usuari x 1
- Brand Card x 1
Producte acabatview
Panell frontal

Imatge: Davant view of the S.M.S.L H400 Headphone Amplifier. The front panel features a digital display on the left, a large rotary volume knob in the center, and two headphone output jacks (one 4-pin XLR balanced, one 6.35mm unbalanced) on the right.
- Pantalla de visualització: Shows current volume level, input source, and other operational information.
- Pom de volum: Controls the output volume. Can also be pressed to access menu options.
- Sortides d'auriculars: Includes a balanced 4-pin XLR output and an unbalanced 6.35mm (1/4 inch) output for connecting headphones.
Panell posterior

Imatge: posterior view of the S.M.S.L H400 Headphone Amplifier. From left to right, it features balanced XLR inputs, unbalanced RCA inputs, balanced XLR pre-outputs, unbalanced RCA pre-outputs, a USB-C update port, a ground switch (Floating/Grounded), and the AC power inlet with an integrated power switch.
- Entrades balancejades (XLR): For connecting balanced audio sources.
- Entrades desequilibrades (RCA): For connecting unbalanced audio sources.
- Balanced Pre-Outputs (XLR): Per connectar a una alimentació externa ampaltaveus o altaveus actius.
- Unbalanced Pre-Outputs (RCA): Per connectar a una alimentació externa ampaltaveus o altaveus actius.
- UPDATE Port (USB-C): Per a actualitzacions de firmware.
- Interruptor de terra: Selects between Floating and Grounded modes to manage ground loops.
- Entrada d'alimentació CA: Connects the included power cable.
- Interruptor d'alimentació: Encén o apaga la unitat.
Configuració
- Col·locació: Place the H400 on a stable, flat surface, ensuring adequate ventilation around the unit. Avoid placing it near heat sources or in direct sunlight.
- Connectar fonts d'àudio:
- For balanced sources, connect XLR cables from your source to the H400's Entrades equilibrades (XLR).
- For unbalanced sources, connect RCA cables from your source to the H400's Entrades desequilibrades (RCA).
- Connecteu els auriculars: Plug your headphones into either the Balanced 4-pin XLR or Unbalanced 6.35mm headphone output on the front panel.
- Connecteu-vos al poder Amplificador (opcional): If using the H400 as a preamplifier, connectar el Balanced Pre-Outputs (XLR) or Unbalanced Pre-Outputs (RCA) to your power amplifier o altaveus actius.
- Connexió d'alimentació: Connect the included power cable to the Entrada d’alimentació de CA. on the rear panel, then plug the other end into a suitable AC power outlet (100-240V).
- Encès: Gira el Interruptor d'alimentació on the rear panel to the 'ON' position. The unit will power on, and the display will illuminate.
Instruccions de funcionament
Funcionament bàsic
- Encès/apagat: Use the rear panel switch for main power. The remote control can put the unit into standby.
- Control de volum: Gira el Pom de volum on the front panel or use the volume buttons on the remote control to adjust the output level.
- Selecció d'entrada: Premeu el botó Pom de volum briefly to cycle through available input sources (Balanced, Unbalanced). Alternatively, use the input selection buttons on the remote.
- Configuració de guany: The H400 offers High, Medium, and Low gain settings. These can be adjusted via the menu system, typically accessed by pressing and holding the volume knob or a dedicated button on the remote.
- Balanced Gain: Low (-5.8dB), Medium (6dB), High (20.4dB)
- Unbalanced Gain: Low (-11.8dB), Medium (0dB), High (14.4dB)
Control remot
The included remote control provides convenient access to all functions, including power, volume, input selection, and menu navigation. Ensure the remote has fresh batteries and an unobstructed line of sight to the H400's front panel sensor.
Manteniment
- Neteja: Feu servir un drap suau i sec per netejar l'exterior de la unitat. No utilitzeu netejadors líquids ni dissolvents.
- Ventilació: Assegureu-vos que les obertures de ventilació no estiguin bloquejades per evitar el sobreescalfament.
- Apagar: Always power off the unit using the rear switch when not in use for extended periods.
Resolució de problemes
| Problema | Causa possible | Solució |
|---|---|---|
| Sense poder | Power cable not connected; Rear power switch off; Power outlet faulty. | Check power cable connection; Ensure rear power switch is ON; Try a different power outlet. |
| Sense sortida de so | Incorrect input selected; Volume too low; Headphones not connected properly; Source device not playing. | Select correct input; Increase volume; Reconnect headphones; Verify source device is playing audio. |
| So distorsionat | Input signal too high; Gain setting too high; Faulty cables. | Reduce source volume; Adjust H400 gain setting; Check and replace cables if necessary. |
| El comandament a distància no funciona | Batteries depleted; Obstruction between remote and unit; Remote sensor blocked. | Replace batteries; Remove obstructions; Ensure clear line of sight to the unit's front panel. |
Especificacions
| Paràmetre | Valor |
|---|---|
| Preamp Mètode de sortida | Equilibrat, desequilibrat |
| Output Power (16Ω) | 15W x 2 |
| Output Power (32Ω) | 7.5W x 2 |
| Output Power (300Ω) | 1000 mW x 2 |
| Output Power (600Ω) | 550 mW x 2 |
| SNR | 133 dB |
| Interval dinàmic | 133 dB |
| THD+N | -123dB, 0.00006% (1kHz, 32Ω) |
| Impedància d'entrada | 47kΩ |
| Impedància de sortida dels auriculars | Approximately 0Ω |
| Preamp Impedància de sortida (equilibrada) | 44Ω |
| Preamp Output Impedance (Unbalanced) | 22Ω |
| Resposta de freqüència | 20 Hz-100 kHz (-0.5 dB) |
| Gain (Balanced) | Low (-5.8dB), Medium (6dB), High (20.4dB) |
| Gain (Unbalanced) | Low (-11.8dB), Medium (0dB), High (14.4dB) |
| Consumption (EN60065) | <50W |
| Consum d'energia en espera | <0.5W |
| Dimensions (AxAxP) | 254x46x189 mm |
| Pes | 2.03 kg / 4.47 lliures |
Garantia i Suport
For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official S.M.S.L weblloc web. Conserveu el comprovant de compra per a reclamacions de garantia.





