A new creation from Audio-GD, the R-27HE is a balanced R2R DAC ladder with a built-in headphone amplifier and ACSS preamplifier. This improved version of the R-27 now features a regenerative power supply capable of providing an extremely clean electrical signal to the audio circuits. The entire design benefits from great attention to detail and component selection to provide the best possible sonic performance. The R-27HE also features a FIFO buffer with an optimized FPGA and a highly efficient reclocking system.

Key features :

• Four sets of discrete, independent hardware DSD decoders.
• Eight groups of discrete R2R DA modules, forming a balanced two-channel push-pull decoder.
• Dual TCXO Accusilicon clock with frequencies of 90 and 98MHz, providing perfect synchronization to the whole device.
• USB and HDMI inputs equipped with isolators and separate linear power supplies to drastically limit interference.
• Bidirectional USB transmission, providing the I2S signal to the FPGA and receiving the synchronous clock signal from it.
• ACSS non-feedback headphone amplifier capable of developing significant power to accompany all types of headphones.
• Unique regenerative power supply technology to provide extremely clean power supply to the various circuits of the device.
• Solid aluminum frame.

R2R Ladder DAC 

The stage in charge of the analog/digital conversion is based on 4 integrated shielded DA-7 V2 modules. These modules directly interpret each bit of the digital signals to reconstruct the analog signal. Each module performs its task by acting on a network of resistors with a given value (R) and its double (2R), without going through an oversampling phase. This particular construction allows to decode digital signals with a quasi insensitivity to jitter while avoiding any possibility of recovering clock noises in the output signal.

Each channel is decoded separately by its own set of modules to achieve optimal crosstalk. To take this a step further, each channel of the stereo system uses its own linear power supply to minimize the amount of noise that can affect the soundstage and the stereo.

The module sets are supported by an FPGA. This one is in charge of the synchronization of the audio signals and the rejection of the jitter. It allows to offer a more precise and transparent sound restitution, while drastically reducing noise. 3 Accusilicon clocks are also integrated, allowing once again to reduce jitter to a minimum thanks to an optimal synchronization of the signals.