REFERENCE-D1 DAC

REFERENCE-D1 is the high end product of Totaldac. Most components have been improved from the REFERENCE-A1 DAC, the resistors, the power supplies, the output stage, the FPGA etc... and it has many different inputs and outputs especially USB input which allows to listen easily from a computer. The embedded digital volume control allows to interconnect the DAC between a drive or a computer and a power amplifier.
-192KHz asynchronous Xmos USB, optical, RCA and AES-EBU digital inputs, selectable from a remote control.
-44.1KHz, 48KHz, 88.2KHz, 96KHz, 176.4KHz and 192KHz, 16 to 24 bit formats supported on all inputs except 96KHz max for optical input.
-RCA, XLR analog output and 3.3Vrms max 32ohm to 600ohm headphone amplifier.
-digital volume control, adjusted by a remote control and an OLED display.
-adjustable 3.3Vrms max output level.
-phase polarity selected by remote control.
-non-oversampling FIR digital filter activated or disactivated by remote control.
-display switch off by remote control or automatic.
-R2R DAC technology using VishayPG foil naked (VAR) 0.01% resistors, 100 resistors per stereo channel.
-class A, low impedance, discrete transistor output stage.
-supplied with rubber feet and metal cone feet, easy to swap.
-external power supply to minimize the noise on the embedded preamp. Not yet visible on the photo.
-aluminium and PMMA enclosure.
-controlled quantity of raw material, limited weight for the shipping, easy manipulation, 4kg unpacked.
-power consumption 20W.

Available options:
-dual DAC option, using 2 DACs per channel for a 100% balanced DAC. Available for DAC and two way crossover. Improves the XLR output but leaves the RCA and headphone outputs unchanged.
-Adjustable 18dB/oct high pass filter to attenuate sub bass to solve a room acoustics problem or to protect the loudspeakers or to remove sub bass when listening with a headphone or to remove the recording offset or to preserve neighbours or children at night.
-110V-120V power option.
-BNC coaxial digital input.
-REFERENCE-D2 and REFERENCE-D3 ,69 bits 2 way and 3 way crossovers including a digital preamp for the main volume control and also for the relative level between bass, midrange and treble.

prices

Photos:




Two types of feet are supplied:


The power supply:



The electronic boards:


Measurements:

1KHz -110dBFs sinewave FFT:

The test is done in the worst case conditions:
-DAC REFERENCE-D1 without option.
-RCA output.
-display switched ON.
-USB input connected to a basic computer plugged on the mains, usually measurements are made from the AES-EBU of a professional audio analyser, easier than a computer USB link. Although a computer can be a noisy source and although the RCA output is not as immune as the xlr output the noise floor is as low as -150dBFs!
The noise floor with the dual DAC option will be 3dB better.

contact: [email protected]