


QED Performance QE7747 Digital Audio Coaxial RCA Cable 3m
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QED Performance Digital Audio Cable 3m
Digital audio is often treated as simple. After all, the signal is just ones and zeros, right? Not quite.
Moving digital audio from a source to a DAC requires timing, precision and protection from interference. When those things aren't taken seriously, the result can be increased jitter, signal degradation and a system that's not performing at its best. Performance Digital Audio is designed to take care of that connection.
Using a true 75Ω cable geometry, low-loss dielectric materials and enhanced dual-layer screening, it's engineered to transfer digital audio accurately and reliably between source and DAC. The kind of thoughtful engineering that's built QED's reputation over more than five decades.
Whether you're connecting a streamer, CD transport or digital music source, Performance Digital Audio gives you the confidence that you've got this connection right.
Features
- True 75Ω characteristic impedance for accurate S/PDIF signal transfer
- Solid-core 99.999% oxygen-free copper conductor
- Low-loss foamed polyethylene dielectric
- Dual-layer shielding for enhanced protection against interference
- Low insertion-loss design to help preserve signal integrity
- Ultra-flexible TPE jacket for easy installation
- Gold-plated connectors for long-term reliability
Explore the full range in Audio Interconnects.
Specification
| Conductor Material | Solid 99.999% Oxygen-Free Copper |
|---|---|
| Conductor Construction | 1 × 1/0.58 mm (23 AWG) |
| Screening Material | Aluminium/Mylar Foil Plus Tinned Copper Shield Braid |
| Dielectric | Extruded Foamed Polyethylene |
| Loop Resistance | 0.075 Ω/m |
| Parallel Capacitance | 58 pF/m |
| Loop Inductance | 0.39 μH/m |
| Dissipation Factor | 0.0090 @10kHz |
| Characteristic Impedance | 75 Ω |
| Outside Diameter | 6 mm |
| Jacket Finish | Stone Grey TPE |
What's Included
- QED Performance Digital Audio Cable 3m
QED
About the QED QE7747
From our tech experts at CEN
The QED Performance QE7747 is the longest coaxial digital cable in the Performance range at 3m. It is built to a true 75Ω impedance with a solid-core 99.999% oxygen-free copper conductor and aluminium/Mylar foil plus tinned copper braid shielding, to carry S/PDIF audio cleanly over a longer run to a DAC or amplifier.
Who it suits
Choose 3m when the digital source is away from the DAC, such as a streamer or TV box by the screen feeding a hi-fi on another unit. For equipment on the same rack, the 1.5m QE7744 or 0.75m QE7741 avoids spare cable.
Our tech experts advise
The dual-layer shielding helps over distance, but still route the cable clear of mains leads. Use the coaxial digital output on the source, not an analogue phono socket, and select coaxial input on the DAC. If your devices only offer optical, the 3m QE7757 optical cable is the alternative.
Explore the full QED range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all QED
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Frequently Asked Questions
Q: What is the QED QE7747 used for?
A: The QE7747 carries coaxial S/PDIF digital audio between a digital source, such as a streamer or CD transport, and a DAC or amplifier with a coaxial (RCA) digital input.
Q: What impedance is the QE7747?
A: It is a true 75Ω cable, the correct characteristic impedance for S/PDIF coaxial digital audio.
Q: What length is the QE7747?
A: The QE7747 is 3m long. It is also available in 0.75m (QE7741) and 1.5m (QE7744).
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