Primare CD31
Beschrijving / Description
The CD31's basic circuitry is much like the D30.2's. The S/PDIF signal moves from the transport to a DIR1703 digital receiver and two Burr-Brown PCM1704-K D/A converters per channel, resulting in a true balanced analog signal. Each component of the signal goes through a Burr-Brown OPA2134 op-amp for voltage-to-current conversion, then finally to the output stage, which uses an active current source to drive matched discrete MOSFETs. According to Medalen, the differences are in the details and optimization, and he suggested I take a close look under the CD31's cover. "We put a lot of effort into the power supply," he said, "adding storage throughout the circuits, and keeping the paths between storage and delivery as short as possible."
Sure enough, the CD31's main circuit board looked like Nebraska farmland, with silo-like clusters of capacitors liberally scattered across the plain something like 140 caps, according to my casual count. This is in addition to Primare's basic CD-player architecture, in which each circuit block has its own thirteenfold filtered power supply, actively regulated in the case of the analog output stage. Medalen summed it up: "The new transport is much quieter and more stable, so it gives us more information to work with. The circuit and power-supply modifications allow you to use this, and to translate the information into better resolution of subtle nuances."
Specificaties / Specifications
Description: Integrated CD player.
D/A conversion: 8x-oversampling, 4 Burr-Brown PCM1704 K 24-bit/96kHz D/A converter chips. Digital filter: Burr-Brown DF1704 24-bit/96kHz.
Output level: fixed, 2.0V unbalanced, 4.0V balanced.
THD+noise: 0.01%, 20Hz- 20kHz.
Output impedance: 100 ohms.
Frequency response: 20Hz-20kHz, +0/-0.5dB.
Signal/noise: 105dB, A-weighted. Outputs, analog: 1 pair unbalanced (RCA), 1 pair balanced (XLR). Outputs, digital: 75 ohm S/PDIF (RCA), 110 ohm AES/EBU (XLR), optical. Inputs: RS-232, Primare intercomponent data link. Power consumption: 34W standby.
Dimensions: 17" (430mm) W by 4" (100mm) H by 15" (385mm) D. Weight: 24 lbs (11kg).