Introduzione
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 amppiù vivu.
Funzioni di u produttu
- 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.
Cuntenutu di u pacchettu
Verificate u pacchettu per i seguenti elementi:
- S.M.S.L SD-793II DAC Unit
- Adattatore di alimentazione (DC 9V)
- Guida Quick Start
Sè qualchì articulu manca o hè dannighjatu, cuntattate u vostru rivenditore.
Figure B: The S.M.S.L SD-793II unit shown with its power adapter and retail packaging.
Istruzzioni di sicurità
- Alimentazione elettrica: Aduprate solu l'adattatore di corrente furnitu. Assicuratevi chì u vulumetage currisponde à a vostra alimentazione lucale.
- Ventilazione: Ùn bluccate micca alcuna apertura di ventilazione. Assicuratevi un flussu d'aria adeguatu intornu à l'unità per impedisce u surriscaldamentu.
- L'acqua è l'umidità: Ùn espone micca l'unità à a pioggia, à l'umidità, o à i liquidi chì gocciolanu/schizzi. Ùn mette micca oggetti pieni di liquidi, cum'è vasi, nantu à l'unità.
- Fonti di calore: Mantene l'unità luntanu da fonti di calore cum'è radiatori, registri di calore, stufe o altri apparecchi (cumpresi amplifiers) chì producenu calore.
- Service : Ùn circate micca di serviziu stu pruduttu voi stessu. Cunsultate tutti i servizii à u persunale di serviziu qualificatu.
- Pulizia: Unplug the unit from the power outlet before cleaning. Use a dry, soft cloth only.
Istituisci
- Connect Power: 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.
- Cunnette a fonte audio digitale:
- Input otticu: 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.
- Input 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.
Impurtante: 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.
- Cunnette l'uscita audio analogica:
- Risultatu 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.
- Output per cuffie: 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.
Istruzzioni di funziunamentu
- Accensione / spegnimentu: 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.
- Sceglie l'Input: 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.
Mantenimentu
- Pulizia: Use a soft, dry cloth to wipe the exterior of the unit. Do not use liquid cleaners or solvents.
- Conservazione: Sè vo almacenate l'unità per un periodu prolongatu, scollegatela da a rete elettrica è almacenatela in un locu frescu è asciuttu.
- Sustituzione di cumpunenti: 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.
Risoluzione di prublemi
- Nisuna uscita di sonu:
- 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.
- Test with a different audio source or output device to isolate the problem.
- Qualità di sonu distorta o scarsa:
- Verificate per e cunnessione di cable loose.
- Ensure the digital audio source is set to PCM stereo output.
- Verificate chì u 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'unità ùn s'accende micca:
- Check the power adapter connection to both the unit and the wall outlet.
- Assicuratevi chì a presa murale sia funzionale.
- Pruvate una presa di corrente diversa.
Specificazioni
| Interfaccia di Input | Coaxial or Optical Fiber (with switch) |
| Frequenza di input | 44.1, 48, 96 KHz / 16 / 24 BIT |
| Rapportu Segnale-Rumore (SNR) | > 113 dB |
| Gamma Dinamica | 105 dB |
| Distortion (1 KHz) | < 0.0006% |
| Output nominale | 1.7 VPP |
| Risposta di Frequency | 20 - 20 KHz (-0.2 dB) |
| Putenza tutale di output | < 8 W |
| Potenza di uscita di cuffie | 65 mW @ 16Ω; 130 mW @ 32Ω |
| Headphone Output Distortion | 0.01% THD + N @ 100mW/32Ω |
| Numero di canali | 2 |
| Dimensioni di u produttu | 8.9 x 6.7 x 2.5 inch |
| Pesu di l'articulu | 14.4 once |
| Numero di mudellu | SD793II |
Infurmazioni di Garanzia
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.
Assistenza Clienti
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 websitu per risorse supplementari è informazioni di cuntattu.
