CD Transport
A CD transport is a player designed exclusively to read compact discs without the inclusion of analogue components such as a DAC or an RCA output. It only offers a digital output. By dispensing with certain elements, jitter and noise are minimised, which significantly improves listening on equipment with high quality amplifiers and speakers.
What is a CD Transport?
A CD transport is a component of an audio system dedicated exclusively to reading data from CDs. Unlike conventional CD players, it does not have a built-in DAC (Digital-to-Analog Converter), so it does not convert the digital signal to analog. Instead, it sends the unprocessed digital signal to an external DAC.
Features of CD Transports
CD transports use high-quality optical systems to precisely read digital data from CDs and minimize errors. They include digital outputs such as coaxial, optical (TOSLINK), and, in some models, AES/EBU or even USB. These devices often feature robust construction designed to minimize vibrations, with optimized transport mechanisms for stable reading. They are designed to pair with external DACs, allowing greater customization of the sound system.
Advantages of a CD Transport
By relying on a high-quality external DAC, CD transports deliver better sound than integrated players. They offer flexibility to upgrade or change the DAC without replacing the transport. Separating CD reading from digital-to-analog conversion reduces electrical noise.
Technical Aspects to Consider
Digital outputs include coaxial (RCA), which balances signal quality and compatibility, and optical (TOSLINK), which uses fiber optics to eliminate electrical interference. AES/EBU provides a professional-grade option with superior signal balance, typically using XLR connectors. Some modern transports also include USB to connect directly to compatible DACs.
The precision of the transport’s internal clock directly impacts audio quality by reducing jitter, or temporal variations in the digital signal.
Build quality is another important aspect. Anti-vibration chassis designs minimize the impact of external vibrations on reading quality. Loading mechanisms vary, with tray, top-loading, or sliding mechanisms offering different advantages in durability and stability.
While primarily designed for standard audio CDs, some transports can also read CD-Rs, CD-RWs, and even SACDs in specific models.
What to Consider When Buying a CD Transport
When choosing a CD transport, consider the design and build quality, as a robust design ensures greater durability and stable performance. Check the available digital output options and their compatibility with your DAC. Opt for reputable manufacturers known for quality and customer service.
Alternatives to a CD Transport
If you do not have an extensive CD collection or prefer a more modern setup, you might consider CD players with built-in DACs, which provide a convenient all-in-one solution. High-resolution streaming platforms like Tidal, Qobuz, or local services offer sound quality comparable to CDs. Alternatively, you can convert your CDs to FLAC or WAV files and play them from a digital audio server.