The d1-driver is an analog driver. It is usually connected to the output of the DAC.
It is an answer to the endless question “is it better with or without preamp?”.
The strength of preamps is there active stage more than their volume control. The active stage helps driving the power amp.
Traditional preamps have been designed when people had several analog sources: LP, cassette, FM tuner, CD player…
Some of us still use LP today, in this case you can connect the LP via a Digital to Analog converter to the DAC, or keep a traditional preamp.
A d1-driver can also be added in the chain between the DAC and a traditional preamp (solid state, tube or passive) to improve the sound of the DAC.
Many of us use just a DAC as source. The d1-driver is the solution in this case to get the best sound, the lowest noise and the most friendly volume control from a Totaldac DAC remote.

Its drive capability allows the d1-driver to improve the sound of a DAC, improving bass control, articulation, presence, soundstage and life.
It has been tested when connected between a DAC and a power amplifier (transistor or tube), but also between a DAC and an integrated amplifier.
The d1-driver has no volume control because it relies on the DAC volume control.
It has been tested in association with the d1-core up to the d1-direct and d1-twelve DACs, with a big sound improvement even with DACs having a 3.3V output and 40ohm output impedance.

“Arise in believability factor were evident from the very first song, which is not something I can say for even some of the high-end audio preamplifiers a few times the price.” Matej Isak, MONO&STEREO
“Le ressenti dynamique progesse autant en régime macro qu’en régime micro.
L’illusion d’y être est superbe.
Comme d’habitude avec un Totaldac, on est happé par cette définition pure qui s’installe, par ce naturel qui vous hypnotise, par cette transparence qui vous fait découvrir les méandres encore insoupçonnés d’un accord ou de l’intention d’un artiste.”
 Haute Fidélité

Magico main demo room uses a d1-driver

Taiko Audio main demo room uses a d1-driver

Another reference system in the USA, based on Rockport Lyra speakers

-one-box stereo version: RCA inputs, RCA outputs + unbalanced XLR outputs
-two-box monobloc version: RCA inputs + XLR inputs, RCA outputs + balanced XLR outputs
-voltage gain: 0dB gain (x1 factor) or 10dB gain (x3 factor), chosen on order
-very high bias current class A design for a natural low output impedance and low distorsion
-very high grade components in the signal path, some of them custom made.
-extreme low noise due to discrete design (no IC at all) and external power supply, matching the noise of d1-twelve DAC
-very easy input impedance: 1MegaOhm
-natural low output impedance plus added 40ohm pure resitor for a perfect interconnect impedance matching
-can drive anything above 100ohm without distorsion
-distorsion: 0.0025%
-frequency cut-off at -3dB, RCA output: 2.5MHz
-using 0.01% VAR Bulk Metal® Foil resistors from Vishay in critical parts of circuit
-signal ground can be connected to the earth or left floating, to avoid any ground loop noise
-aluminium and PMMA enclosure with massive pure copper antivibration plate
-power consumption 20W
-main box dimensions: height 110mm, width 360mm, depth 290mm
-power supply dimensions: height 65mm, width 122mm, depth 180mm
-weight: 7kg

Available options:
-one-box stereo version or monoblocs version.
-0dB or 10dB voltage gain.
-two pairs of RCA outputs for a subwoofer or a headphone amplifier or for bi-amping.
-silver massive aluminium front panel.
-115V power option.

 

prices

These videos allow you to listen to the effect of the d1-driver:
Mozart piano Youtube video
Christmas song Youtube video
Drum solo Youtube video

Rear view of the stereo version:

Rear view of the monobloc version:

d1-driver inside:

The d1-driver has been chosen as reference pre-amplifer by monoandstereo.com:

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