totaldac

Amp-1, the amplifier

The Amp-1 amplifier was first made for Totaldac internal need. Here is its story.
In 2018 Alon Wolf, founder of Magico, contacted me to evaluate a Totaldac source. I sent a d1-twelve-mk2 and a d1-driver to Magico's demo room in California.
Alon decided to keep the DAC and it was an opportunity for me to get a pair of Magico M6 speakers.
I had several amplifiers on hand to drive the M6. Triode, pentode, transistor class A, class AB and class D amplifiers. None could exhibit all qualities of the M6 at the same time.
I tried many amplifiers from the best brands, at any price, and again I could not get the real-life timbre and openness of tubes with the drive capability of the biggest transistor amplifiers and without harsh sound so often found with transistor amplifiers.
So I developped my amplifier for my own need, starting from a prototype already made by an experimented partner, and I was free to optimise it my way.
The Amp-1 use a triode voltage amplifying stage and a high current transistor buffer, to give roughly the best of tubes and transistors, and tuned with a d1-twelve-mk2 DAC as reference.
Each step was tested on Magico M6 and on my big coax horn system, and sometimes also the Totaldac d150 speakers and the Camerton one-way bookshelves.
The Magico being moderate efficiency and difficult impedance, the big horn system being 105dB/1W/1m efficiency with easy 8ohm impedance.
An amplifier giving the best sound in these two opposite environnements will work as great with all hifi speakers.

"The hybrid stereo Amp-1 played the Magico M6 with a fresh, pliant authority.
With the Amp-1, they almost completely relaxed. With the Amp-1, they opened up spatially and dynamically.
I asked Brient to play a solo-piano recording and was surprised by the scale and fullness of the instrument that appeared between the M6s.
Tone was the most life-like I have heard from Magico."
Herb Reichert, Audiostream and Stereophile
"Sur un passage d'orgue, la puissance est impressionnante dans l'extrême grave, sans aucune confusion, d'une netteté alliée à un délié rare, en plus d'une capacité dynamique à l'énergie sans limite, comme sur le French Cancan endiablé. Surtout l'Amp-1 alliée au sources Totaldac sait mettre en valeur la finesse et la définition des Magico M6, en apportant plus de matière sans rajouter de surbrillance dans l'aigu qui reste d'une variété incroyable, sans raideur comme parfois avec certaines électroniques à transistor puissantes." Haute Fidélité

totaldac Amp-1 amplifier

totaldac Amp-1 amplifier

preliminary specifications:
stereo power amplifier
zero global feedback
fully discrete design
triode main stage and solid state output
class AB with medium level of class A for moderate power consumption and for moderate heat in the room
2500VA, 26kg LIVE-POWER transformer with separate windings for left and right channel
designed on Magico M6 and on a 105dB large coax horn system
low noise truely tested on very high efficiency speakers
RCA inputs (XLR on the monobloc version only)
largest Mundorf binding posts
2*160W under 8ohm
2*300W under 4ohm
2*500W under 2ohm
stable under 1ohm
28dB gain
1.5V sensitivity
input impedance from 0Hz to 20KHz > 3.5Kohm
frequency response at -3dB: 0.06Hz to 300KHz
distorsion: 0.05% at 20W
power consumption when music level is low: 165W
248mm height including feet
483mm width
453mm depth including connectors
54kg weight

prices

Available options:
-2 pairs of RCA inputs and a switch, to select a digital system (DAC + d1-driver) or an analog system (LP + conventional preamp)
-115V power (standard is 220/240V)

Monobloc version:
-fully balanced from the input to the output
-XLR input instead of RCA
-2 sets of binding posts
-600W under 8ohm
-1000W under 4ohm


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