Introdução
The S.M.S.L SD-793II is a high-performance Digital-to-Analog Converter (DAC) with an integrated headphone amplifier. It is designed to convert digital audio signals from various sources into high-fidelity analog audio, suitable for connection to amplifiers, active speakers, or headphones. This manual provides essential information for the proper setup, operation, and maintenance of your SD-793II unit.
Figure A: The S.M.S.L SD-793II unit, a compact digital to analog converter with integrated headphone ampmais vivo.
Características do produto
- Utilizes the advanced DIR9001 digital receiver chip, supporting up to 24-bit/96KHz signal reception.
- Incorporates the high-quality PCM1793 D/A converter chip for 192K/24Bit audio conversion.
- Features an active low-pass filter output with an OPA2134 operational amplifier, which can be changed by the user for sound customization.
- Supports both coaxial and optical fiber digital audio inputs with a convenient switch.
- Integrated headphone amplifier with a 6.35mm headphone jack on the front panel.
- Provides both RCA and headphone jack analog audio outputs.
- Constructed with a durable aluminum shell, precision CNC processed, with an oxidized finish and a custom solid aluminum anti-skid volume knob.
Conteúdo da embalagem
Por favor, verifique se a embalagem contém os seguintes itens:
- S.M.S.L SD-793II DAC Unit
- Adaptador de energia (DC 9V)
- Guia de início rápido
Caso algum item esteja faltando ou danificado, entre em contato com o revendedor.
Figure B: The S.M.S.L SD-793II unit shown with its power adapter and retail packaging.
Instruções de segurança
- Fonte de energia: Utilize apenas o adaptador de energia fornecido. Certifique-se de que o volume esteja correto.tage corresponde à sua fonte de alimentação local.
- Ventilação: Não obstrua nenhuma das aberturas de ventilação. Garanta uma circulação de ar adequada ao redor do aparelho para evitar o superaquecimento.
- Água e Umidade: Não exponha o aparelho à chuva, umidade ou respingos/gotejamento de líquidos. Não coloque objetos contendo líquidos, como vasos, sobre o aparelho.
- Fontes de calor: Mantenha a unidade longe de fontes de calor, como radiadores, aquecedores, fogões ou outros aparelhos (incluindo amplificadores) que produzem calor.
- Manutenção: Não tente consertar este produto sozinho. Encaminhe todos os serviços de manutenção para pessoal de serviço qualificado.
- Limpeza: Unplug the unit from the power outlet before cleaning. Use a dry, soft cloth only.
Configurar
- Conecte a energia: Insert the DC 9V power adapter into the "DC+9V" input jack on the rear panel of the SD-793II. Plug the adapter into a wall outlet.
- Conectar fonte de áudio digital:
- Entrada óptica: Connect an optical fiber cable from your digital audio source (e.g., TV, CD player, game console) to the "OPTICAL" input on the rear panel.
- Entrada Coaxial: Connect a coaxial cable from your digital audio source (e.g., DVD player, computer sound card) to the "COAXIAL" input on the rear panel.
Importante: Ensure your digital audio source is configured to output PCM stereo audio. Multichannel formats like Dolby Digital or DTS are not supported and may result in no sound or clicking noises.
- Conecte a saída de áudio analógica:
- Saída RCA: Connect RCA cables from the "R OUT" (right) and "L OUT" (left) jacks on the rear panel to your amplifier, active speakers, or other analog audio input device.
- Saída de fone de ouvido: For private listening, plug your headphones into the 6.35mm headphone jack on the front panel.
Figure 1: Rear panel connections of the SD-793II, illustrating optical, coaxial digital inputs, RCA analog outputs, and the DC 9V power input.
Figure 2: Front panel controls of the SD-793II, including the power button, input select button, 6.35mm headphone jack, and volume control knob.
Instruções de operação
- Ligar/desligar: Press the "POWER" button on the front panel to turn the unit on or off. An indicator light will illuminate when the unit is powered on.
- Selecione Entrada: Press the "SELECT" button on the front panel to switch between the optical and coaxial digital inputs. The corresponding indicator light will show the active input.
- Adjust Headphone Volume: Rotate the large knob on the front panel to adjust the volume for the connected headphones. This control only affects the headphone output. The RCA line output is fixed.
Manutenção
- Limpeza: Use a soft, dry cloth to wipe the exterior of the unit. Do not use liquid cleaners or solvents.
- Armazenar: Se for armazenar a unidade por um período prolongado, desconecte-a da fonte de alimentação e guarde-a em local fresco e seco.
- Substituição de componentes: The OPA2134 operational amplifier is user-changeable. If you choose to replace it, ensure the unit is powered off and unplugged. Exercise caution and refer to appropriate guides for safe component handling.
Solução de problemas
- Sem saída de som:
- Ensure the unit is powered on and the power adapter is securely connected.
- Verify that the correct input (Optical or Coaxial) is selected using the "SELECT" button.
- Check all audio cable connections (digital input, RCA output, headphone).
- Confirm that your digital audio source is outputting PCM stereo audio, not a multichannel format (e.g., Dolby Digital, DTS). Adjust source settings if necessary.
- If using headphones, ensure the volume knob is turned up.
- Faça o teste com uma fonte de áudio ou dispositivo de saída diferente para isolar o problema.
- Qualidade de som distorcida ou ruim:
- Verifique se há conexões de cabo soltas.
- Ensure the digital audio source is set to PCM stereo output.
- Verifique se o sample rate and bit depth of the input signal are within the supported range (up to 24-bit/96KHz for DIR9001, 192K/24Bit for PCM1793).
- If using headphones, ensure they are properly connected and not damaged.
- Clicking Noise from Unit:
- A mechanical relay inside the unit may produce a click when the audio signal starts or stops, or when switching sources. This is normal operation.
- If continuous clicking occurs, ensure your digital audio source is set to PCM stereo output, not a multichannel format.
- O aparelho não liga:
- Check the power adapter connection to both the unit and the wall outlet.
- Verifique se a tomada da parede está funcionando.
- Experimente uma tomada diferente.
Especificações
| interface de entrada | Coaxial or Optical Fiber (with switch) |
| Frequência de entrada | 44.1, 48, 96 KHz / 16 / 24 BIT |
| Relação Sinal-Ruído (SNR) | > 113 dB |
| Faixa dinâmica | 105 dB |
| Distortion (1 KHz) | < 0.0006% |
| Saída nominal | 1.7 VPP |
| Resposta de frequência | 20 - 20 KHz (-0.2 dB) |
| Potência total de saída | < 8 W |
| Potência de saída do fone de ouvido | 65 mW @ 16Ω; 130 mW @ 32Ω |
| Headphone Output Distortion | 0.01% THD + N @ 100mW/32Ω |
| Número de canais | 2 |
| Dimensões do produto | 8.9 x 6.7 x 2.5 polegadas |
| Peso do item | 14.4 onças |
| Número do modelo | SD793II |
Informações de garantia
S.M.S.L products are designed and manufactured to the highest quality standards. Specific warranty terms and conditions may vary by region and retailer. Please retain your proof of purchase for any warranty claims. For detailed warranty information, refer to the documentation provided with your purchase or contact your authorized S.M.S.L dealer.
Suporte ao cliente
For technical assistance, troubleshooting, or service inquiries, please contact your local S.M.S.L distributor or the retailer from whom you purchased the product. You may also visit the official S.M.S.L website para recursos adicionais e informações de contato.
