ALEF - Delta sigma

ALEF is the new name of Delta Sigma, but also the name of the new series of electronics developed with no compromise and with the only objective to be the best in the world. This is why we decided to give to this new project our name, this electronics want to represent in full our spirit, our soul, our being.

Despite the young age of the company born in late ‘90s our engineers offer an average of 40 years experience each in top hi-end audio design and manufacturing. ALEF is not the idea of a single person, but the integration of many people ideas, each one expert and renamed in his domain of audio design.

Mr. Domenico Simonetti, the founder of Delta Sigma is a journalist, specialized in Hi Tech and hi-end audio. He had the occasion to meet the most of the real actors in the audio and electronics development, each with its idea of how the best reproductions should be, and all animated by a real desire of absolute.

Domenico found an unexpected easy way when he proposed to these engineers, often competitors between them, to collaborate under a new brand, were costs and industrial limitation were no object to realize the common dream, the best audio electronics ever. So born Delta Sigma.

It was this unique, no compromise and solid engineered concept that opened to Delta Sigma the doors of collaboration with most exigent manufacturers of sports car (eg, Porche Gemballa and Pagani) or yachts (eg. Azimuth and Ferretti)

Due to international registration issues, Delta Sigma changes its name into ALEF, with a new logo. Alef means “A”, the first letter of the first alphabet in the history, the Phoenician. This “A” used to be rotated 90o as is in the logo. The five lines represent the pentagram.


Duet SE

Stereo Power Amplifier

The Duet SE is a stereo power amplifier, the first born of the new generation of ALEF’s and replacing the former Finale, the top model of the series North Pole. Circuits are totally new even if the concept remains closed to the principles that made Delta Sigma an undeniable reference. The sound offer the same signature of the Finale but all parameters are here improved to settle new absolute standard.

Amplifier circuit is based on the extraordinary & state-of-the-art DC-6Mhz architecture inherited from very well known Delta Sigma designs.  Here is how prestigious French magazine Haute Fidelitie described new ALEF Duet SE:

Dynamics: “The ALEF communicates tremendous energy on transients. The magnitude when listening to the bass line gives a real sense of presence in the room. The chords are clear and precise, the rhythm is accurately articulated and one feels no bass volume exaggeration meaning the ALEF is sovereign and in control of the lowest octaves.”

Sound staging: “High level of precision of spatial sound staging is a part of this Italian Dual-Mono stereo block. Although it has such extraordinary qualities of dynamics without restraints, one could not expect same high level of signal resolution and equally high level of sound staging. It can virtually create a space of holographic illusion and the Alef creates a portrait of live singing and melodic reproduction”

Tonality/Transparency: “This amplifier offers a very pure listening, very neutral listening experience due in part to the ultra wide bandwidth – on paper and also subjectively. Very powerful male voice & delicate female voice often suggest that of a triode – sometimes approaching the absolute very best with accurate voice without paralysis.”

Awards:  Alef Duet SE earned Haute Fidelitie’s very rare “Reference” award.  Rated “5 stars” (highest) on ALL sonic attributes!

Design features:

  • Extraordinary Power Supply for effortless dynamics!
  • Totally stable even on low impedance loads.
  • No special cables & settings required.
  • Substantial anti-vibration technology on power supply.
  • (2) massive transformers – 680 VA.
  • “Planted” in a thick quartz powder for noise shielding & vibration control.
  • “Drowned” in resin within a very expensive mu-metal shielded enclosure.
  • Entire transformer box is “floated & suspended” by several silent vibration blocks.
  • All magnetic radiation and mechanical vibrations are completely suppressed.
  • Litz ultra-pure copper internal wire standard – optional silver.
  • Key components are hand shielded with a copper foil and grounded.
  • Very high power reserve is provided by many small fast capacitors wired in parallel and positioned as close as possible to active device.
  • Printed circuit board tracings 4x thicker than standard.

Specifications:

Dimensions:48 x 30 x 45 cm

Power:2 x 180W @ 8Ω, 15W in Class A, >10KW peak

Bandwidth:5Hz a 50kHz +/- 0,1dB (bandwidth from DC to 6MHz)

In. levels:Typ. 2V (up to 5V user defined)

Inputs:RCA , XLR(1 pair each)

Output:2 pairs of speaker terminals with pure copper binding posts


Orchestra

Integrated Amplifier

Maybe it seems foreseen, but this is really one of the VERY FEW integrated amplifier that respect the meaning of” integrated”.

The ALEF Orchestra IS a Duet SE with the new DIRECTOR remote controlled preamplifier in the same box.

No compromises are taken, it remains a real Dual Mono conception for both amplifiers with separate power supplies, so is for the preamplifier. This last is a single board, two channels specular implantation of components, mounted on the inner part of back panel to grant no cabling and minimum signal path and it is totally independent from power amp.

The Orchestra can be used as Preamplifier, as amplifier or as a real integrated preamp and amplifier.

We are convinced that this is the best real integrated amplifier in the world!

Orchestra incorporates all ALEF Delta Sigma know-how in one single unit, replacing legacy North Pole Integrated amplifier. The single chassis includes Duet SE stereo power amplifier, well known Director preamplifier from Delta Sigma, and new remote control. Orchestra is one box solution without compromise.

Design features:

  • Integrated amplifier with remote control.
  • “Director” active Dual-Mono Line stage.
  • Remote Control with Ultra-Precise resistor-based attenuator featuring 64-steps.
  • Extraordinary Power Supply for effortless dynamics!
  • Totally stable even on low impedance loads.
  • No special cables & settings required.
  • Substantial anti-vibration technology on power supply.
  • Two massive transformers – 680 VA.
  • “Planted” in a thick quartz powder for noise shielding & vibration control.
  • “Drowned” in resin within a very expensive mu-metal shielded enclosure.
  • Entire transformer box is “floated & suspended” by several silent vibration blocks.
  • All magnetic radiation and mechanical vibrations are completely suppressed.
  • Litz ultrapure copper internal wire standard – optional silver.
  • Key components are hand shielded with a copper foil and grounded.
  • Very high power reserve is provided by many small fast capacitors wired in parallel and positioned as close as possible to active device.
  • Printed circuit board tracings 4x thicker than standard.

Specifications:

Dimensions:48 x 30 x 45 cm

Power:2 x 180W @ 8Ω, 15W in Class A, >10KW peak

Bandwidth:5Hz a 50kHz +/- 0,1dB (bandwidth from DC to 6MHz)

In. levels:Typ. 2V (up to 5V user defined)

Inputs:5 Line in RCA

Preamp.out:2 preamp RCA, Tape monitor out

Output:2 pairs of speaker terminals with pure copper binding posts

Remote:Remote control for input selection and volume control
 


Solista

Mono Amplifier Blocks

ALEF Solista Mono blocks are built on the design of the DUETTO, but packed in two separate enclosures.  The power supply is so doubled to the extraordinary level of >2 KVA continuous power that become over 12 KW peak, to grant the most perfect dynamic and harmonics reproduction without compression, even at higher output peaks.

The Class A bias can also be modified to be at the absolute edge of Music and emotion transfer.

This configuration offers the best possible rejection to noise and higher signal to noise ratio to reproduce even the smallest ambient details.

This configuration resumes what best Alef can do, and we believe to be very close to perfection.

Design features:

  • Extraordinary Power Supply for effortless dynamics!
  • Totally stable even on low impedance loads down to 0.2 Ohms.
  • No special cables & settings required.
  • Substantial anti-vibration technology on power supply and feet.
  • Two massive transformers – 980 VA.
  • “Planted” in a thick quartz powder for noise shielding & vibration control.
  • “Drowned” in resin within a specific mu-metal shielded enclosure.
  • Entire transformer box is “floated & suspended” by several Sorbothane silent vibration blocks.
  • All magnetic radiation and mechanical vibrations are completely suppressed.
  • Litz ultrapure silver/copper internal wire standard – optional silver.
  • Key components are hand shielded with a copper foil and grounded.
  • Very high power reserve is provided by many small fast capacitors wired in parallel and positioned as close as possible to active device.
  • Printed circuit board tracings 4x thicker than standard.

Specifications:

Dimensions:48 x 30 x 45 cm

Power:2 x 200W @ 8Ω, 50W in Class A, >10kW peak

Bandwidth:5Hz a 50kHz +/- 0,1dB (bandwidth from DC to 6MHz)

Input levels:Typ. 2V (up to 5V user defined)

Inputs:RCA & XLR (1 each)

Output:2 pairs of pure copper Mundorf speaker terminals binding posts


North Pole

Legacy Integrated Amplifier

Worldwide known Delta Sigma’s Integrated Amplifier. Based on advanced 3MHz circuit, with spectacular sound – transparently pure, ultra high resolution, unrestrained dynamics and a presentation that captures the true sound of a voice, piano or any musical instrument. Sonically, it represents transparent purity of the finest OTL amplifiers but lightning fast with a greater top end extension, a more open sound, deeper & tighter bottom octaves, more effortlessly explosive dynamics and an amazing lifelike presentation.

Design features:

  • Dual-Mono+ design
  • Separate line-stage & amplifier boards for each channel
  • Separate Power Supply for each board (4 total)
  • The absolute best audio transistor, not industrial designs
  • Only the highest quality parts used
  • Ultra fast with precise damping for clear purity of music & voices
  • Includes 1pr Delta Sigma interconnects for line stage-amp connection
  • “v2″ now includes reference level TKD potentiometer for highest level of transparency & resolution

Specifications:

Dimensions:48 x 30 x 45 cm

Power:150W/ch@8Ω   300W/ch@4Ω   600W/ch@2Ω, peek 2kW/ch@8Ω

Bandwidth:3-3Mhz (±1db)

Preamp levels:Typ. 5V

Inputs:5 Line in RCA

Output:1 Preamp RCA, Tape Monitor Out

Spk. output:Speaker terminals with pure copper binding posts

Remote:No remote