Delta Sigma

04/09/2026

A new power amplifier is ready to be delivered... Special finishing on request

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