Introduction
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 amplifier.
Caractéristiques du produit
- 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.
- Écouteurs intégrés 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.
Contenu du colis
Veuillez vérifier que le colis contient les éléments suivants :
- S.M.S.L SD-793II DAC Unit
- Adaptateur secteur (CC 9V)
- Guide de démarrage rapide
Si des articles sont manquants ou endommagés, veuillez contacter votre revendeur.
Figure B: The S.M.S.L SD-793II unit shown with its power adapter and retail packaging.
Consignes de sécurité
- Alimentation: Utilisez uniquement l'adaptateur secteur fourni. Assurez-vous que le volumetage correspond à votre alimentation électrique locale.
- Ventilation: Ne bloquez aucune ouverture de ventilation. Assurez une circulation d'air suffisante autour de l'appareil pour éviter toute surchauffe.
- Eau et humidité : N’exposez pas l’appareil à la pluie, à l’humidité ou aux projections de liquides. Ne placez pas d’objets remplis de liquide, tels que des vases, sur l’appareil.
- Sources de chaleur : Tenez l'appareil éloigné des sources de chaleur telles que les radiateurs, les bouches de chauffage, les poêles ou autres appareils (y compris amp(échangeurs thermiques) qui produisent de la chaleur.
- Entretien: N'essayez pas de réparer vous-même ce produit. Confiez tous les travaux d'entretien à du personnel de service qualifié.
- Nettoyage: Unplug the unit from the power outlet before cleaning. Use a dry, soft cloth only.
Installation
- Connecter l'alimentation : 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.
- Connecter une source audio numérique :
- Entrée optique : 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.
- Entrée coaxiale : Connect a coaxial cable from your digital audio source (e.g., DVD player, computer sound card) to the "COAXIAL" input on the rear panel.
Important: 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.
- Connecter la sortie audio analogique :
- Sortie 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.
- Sortie casque : 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.
Mode d'emploi
- Marche/Arrêt : 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.
- Sélectionnez Entrée : 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.
- Régler le volume du casque : 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.
Entretien
- Nettoyage: Use a soft, dry cloth to wipe the exterior of the unit. Do not use liquid cleaners or solvents.
- Stockage: Si vous devez entreposer l'appareil pendant une période prolongée, débranchez-le de l'alimentation électrique et rangez-le dans un endroit frais et sec.
- Remplacement des composants : 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.
Dépannage
- Pas de sortie audio :
- Vérifiez que l'appareil est allumé et que l'adaptateur secteur est correctement branché.
- 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.
- Effectuez un test avec une source audio ou un périphérique de sortie différent afin d'isoler le problème.
- Son déformé ou de mauvaise qualité :
- Vérifiez les connexions de câble desserrées.
- Ensure the digital audio source is set to PCM stereo output.
- Vérifiez que le 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.
- L'appareil ne s'allume pas :
- Check the power adapter connection to both the unit and the wall outlet.
- Vérifiez que la prise murale est fonctionnelle.
- Essayez une autre prise de courant.
Caractéristiques
| Interface d'entrée | Coaxial or Optical Fiber (with switch) |
| Fréquence d'entrée | 44.1, 48, 96 KHz / 16 / 24 BIT |
| Rapport signal sur bruit (SNR) | > 113 dB |
| Plage dynamique | 105 dB |
| Distortion (1 KHz) | < 0.0006% |
| Puissance nominale | 1.7 VPP |
| Réponse en fréquence | 20 - 20 KHz (-0.2 dB) |
| Puissance de sortie totale | < 8 W |
| Puissance de sortie du casque | 65 mW @ 16Ω; 130 mW @ 32Ω |
| Headphone Output Distortion | 0.01% THD + N @ 100mW/32Ω |
| Nombre de canaux | 2 |
| Dimensions du produit | 8.9 x 6.7 x 2.5 pouces |
| Poids de l'article | 14.4 onces |
| Numéro de modèle | SD793II |
Informations sur la garantie
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.
Assistance clientèle
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 pour des ressources supplémentaires et des informations de contact.
