Delta Sigma

21/05/2026

A few days ago I experienced one of those tests that remain etched in my memory. I was able to listen to our Delta Sigma Aussa Mac monoblocks paired with MBL 101 MKII omnidirectional speakers, that is with 81dB efficiency. Downstream from the source and the DAC is a tube preamp that sends the signal to an active crossover. From there, the path splits: the mid-bass, midrange, and treble sections are driven by the powerful Karan KSA600 (600W stereo), while the subwoofers have their own dedicated amplification. A system refined over time, with crossovers and fine-tuning meticulously crafted by the enthusiast with the help of Diego Andreoli and his Imagination Audio System subwoofers. The test involved both the preamplifier and the pair of Delta Sigma monoblocks. The tube preamp proved to be very linear and pleasant in the midrange in several respects, but less linear and less firm at the frequency extremes. The Delta Sigma Aussa Mac amplifiers, despite "only" 300W each, were able to assert themselves. The mid-bass response was more substantial, deeper, and controlled than the 600W stereo power amp. This control was physically perceptible. In the mid-high range, however, they delivered a sound rich in harmonics, incredibly musical, with notes that glided with just the right speed and persistence: suspended in the air, defined, alive. After some small final adjustments, the system achieved a level of coherence, naturalness, and engagement that I personally really liked. A very interesting combination that, with some further development and fine-tuning, could become excellent. See you next time.

12/05/2026

Another little detail for our showroom... So you can find us too. We look forward to seeing you 🙏

02/05/2026

Good morning, below is an interview of mine in which I talk about sound and high fidelity. This interview has a popular tone, so simplifications are necessary to keep the discussion less technical. Unfortunately, since it's for an Italian channel, it's in Italian, but automatic subtitles in other languages ​​should be available. Thanks in advance to anyone who'd like to check it out.

8 likes, 2 comments. "Musica, realtà e trasformate di Fourier! - STEMGINE EP. 6"

20/04/2026

First middle size Delta Sigma power amplifier – 180W into 8Ω – officially delivered! After months of development on the new design, it has finally found its home with a customer. We completely renewed the aesthetics and introduced significant circuit improvements:
• More powerful, faster and quieter transformers
• Optimized rectifier bridges
• New refinements that take the sound to the next level. The result? An even more natural sound, incredibly rich in micro and macrodynamics. Anyone who has already listened to the new version knows exactly what I’m talking about. What about you?
Have you already experienced a Delta Sigma, or are you curious to hear how it really sounds? Write “180W” in the comments if you want me to send you photos, measurements and full details, or just message me privately. I’ll be happy to reply personally.

11/04/2026

Today and tomorrow we wait you at our showroom to listen some music togheter. 2 rooms available. One with our amplifiers, Marco Serri Speakers and Faber's Cable wires. Other room with a high end headphones setup with Audio GD and Nur headphones 😎💪. Where? Via Spinelli 13 - Nichelino (TO) - Italy

27/03/2026

April 11 & 12 — Via Spinelli 13 opens its doors.

Delta Sigma Lab — first listening sessions.
Colosseum speakers by MARCO SERRI Design .
Handmade cables by Fabrizio Baretta .
Delta Sigma electronics.

Fabio Camorani from AudioNautes Recordings joins us for a panel on the art of recording.

10am – 7pm. Free entry.
Come when you like. Sit down. Listen.

📍 Via Spinelli 13, Nichelino, Turin — Italy
📞 +39 342 721 1106

24/12/2025

Good morning everyone,
Delta Sigma will not close during the Christmas holidays and remains at your disposal.
We wish you the best possible time during these festive days, surrounded by the people you care about most.
See you in January with new models and many exciting updates we are preparing especially for you!
🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉

03/12/2025

There are encounters that fate keeps suspended for years, like notes held back on the edge of silence, and then, when you least expect it, it lets them fall... and everything becomes magic. It happened yesterday, just outside Düsseldorf.

The Delta Sigma amplifiers and FS Musical Systems wideband speakers finally looked each other in the eye. All it took was a slow gesture, a cable finding its way, and the air was filled with a deep sigh. The music arrived like a loved one returning home after too long.

Every note was there, bright, perfectly drawn in space, enveloped by its procession of harmonics that caressed the skin. The piano... ah, the piano wasn't playing: it was speaking. A warm, intimate voice, so real that you closed your eyes and saw it there in front of you, with the keys pressing themselves under invisible, loving fingers. The transients flashed by like stolen kisses, precise, electric, full of life.

Time stood still, or perhaps it decided to dance with us: the hours slipped away lightly, sweetly, weightlessly. When it was over, we remained silent for a moment too long, like after a kiss you don't want to interrupt. We'll see each other again soon.

I know it.

Because certain encounters, once they have happened, no longer accept being postponed.

25/11/2025

Imagine closing your eyes and finding yourself two metres from the stage...
The singer's breath before the note, the wood of the double bass vibrating, the reverberation of the hall enveloping you as if you were there.
It's not a dream: it's what happens when our Delta Sigma amplifiers meet Marco Serri Design loudspeakers. From 5 to 7 December 2025
Tecsart – Bussy Saint Georges (Paris) Three days of exclusive listening sessions, with only a few places available per session.
We will listen some different sources on a system that few have had the privilege of hearing at live volume: Delta Sigma Reference mono blocks (latest evolution)
Marco Serri “La Voce” – speakers unique in the world, fresh out of the laboratory

It will not be a “technical demonstration”.
It will be an experience that many will remember as the day they understood how real reproduced music can be. Places are strictly limited and already rapidly diminishing.
Reservations are recommended, please contact Tecsart. 5-6-7 December
Come and hear what ‘uncompromising emotion’ means.

30-34 Av. Graham Bell Lot A1, 77600 Bussy-Saint-Georges, France

14/11/2025

Our audience is growing – and now winning over women too.
More and more women are choosing our exclusive customization, crafted with the artistry only an Italian artisan can deliver: unique finishes, tailor-made details, a sound that truly reflects your personality. Discover the new finishes now available.
Ask your trusted retailer today:
this isn’t just an amplifier – it’s your voice.

30/10/2025

An unusual pairing of our amplifier and preamplifier with JBL Studio Monitor 4430 speakers, but with very interesting results in terms of dynamics, realism and emotion