With streaming now everywhere, CDs could easily have fallen into oblivion. Yet those who own physical collections know that a well‑designed transport mechanism changes everything. The CDT-10 is the culmination of NuPrime’s work on CD playback, building on the achievements of the CDT-8 Pro while adopting the chassis and power supply of the 10 series. The result: a compact transport that extracts the very best from the 16-bit/44.1 kHz format.
A silent mechanism, a rigid chassis
The CDT-10’s philosophy is based on a simple principle: CD playback quality depends as much on mechanical stability as on the decoding electronics. NuPrime has designed a tubular-structure chassis with vertical and longitudinal reinforcements that evenly distribute vibrations. The drive mechanism is sandwiched between aluminum plates, further isolating the transport from the rest of the unit.
The transport spins at a constant speed, regardless of the position on the disc. This approach, less common than one might think, reduces vibrations linked to speed changes and improves sampling accuracy. The slim yet smooth tray accepts pressed CDs, CD-Rs, and CD-RWs.
Digital processing and error correction
Decoding is handled by an ARM LPC2103F chip that manages reading, writing, and error correction according to Red Book specifications. The Philips SAA7824HL laser pickup, a proven component in the audio industry, ensures precise reading of the tracks. A proprietary algorithm reduces digital interference to keep jitter at a particularly low level.
The master clock drives the entire decoding system, synchronizing each processing stage. This centralized approach limits timing discrepancies that can degrade the quality of the digital signal before it even reaches the external converter.
Selectable oversampling: PCM or DSD
The sample rate converter (SRC) is one of the CDT-10’s standout features. After reading, the audio signal is first oversampled at a very high frequency (in the megahertz range), then brought back down to the rate chosen by the user. This dual conversion aims to reduce quantization artifacts and distortion.
The available rates depend on the output used. The coaxial, HDMI I2S, and AES/EBU outputs can reach 768 kHz in PCM or DSD256 (DoP). The optical output, limited by the Toslink protocol’s bandwidth, tops out at 192 kHz or DSD64. This function is entirely optional: simply disable the SRC via the remote control to keep the native 44.1 kHz signal. Some users actually prefer the non-oversampled sound, often described as more natural, while others appreciate the increased density and precision of higher rates.
Four outputs to fit any system
The rear panel offers a complete range of digital connections. The RCA coaxial output uses a dedicated isolation transformer to eliminate ground loops and electrical noise. The Toslink optical output is suitable for setups where galvanic isolation is a priority, albeit with the bandwidth limitation mentioned above.
The AES/EBU output on XLR connector meets the demands of professional environments or high-end systems equipped with this interface. As for the HDMI I2S output, it transmits the clock signal and audio data separately, reducing jitter compared with standard S/PDIF protocols. This output works with NuPrime converters (Evolution DAC, DAC-9SE, Alita) and is compatible with certain PS Audio models. Compatibility with other brands using the I2S-over-HDMI format is not guaranteed, however, as each manufacturer can define the pin assignment differently.
Filtered and shielded power supply
The power stage benefits from the expertise developed for the Evolution DAC. An R-core toroidal transformer, encapsulated in a metal shield, powers all the electronics. This type of transformer has lower electromagnetic radiation than conventional designs. A built-in mains filter attenuates high-frequency noise from the power grid.
The power supply block is physically separated from the transport section and the digital electronics. This isolation, combined with the supplied anti-vibration feet, contributes to quiet operation. Standby consumption remains modest, and the power supply accepts voltages from 100 to 240 V without a manual selector.
In practice: integration and setup
The CDT-10 connects to any external converter with a digital input. For an all-NuPrime system, the I2S link via HDMI makes full use of the oversampling capabilities. With a DAC from another brand, the coaxial or AES/EBU outputs offer universal compatibility and excellent performance.
SRC configuration is worth experimenting with. Multiples of 44.1 kHz (88.2 kHz, 176.4 kHz, 352.8 kHz) preserve a harmonic relationship with the source signal and are generally preferred for CD playback. Rates in multiples of 48 kHz are more suited to video sources or professional recordings. DSD (DoP) mode is only relevant if the receiving DAC supports this format and the listener appreciates its particular sonic character.
