About



  • I really like what you have done with your site, it is one of the first places I look these days to see what else is going on. Alon Wolf – Founder – CEO and Chief Designer of Magico
  • You are a notable exception to the sea of online “experts” who talk about the latest and greatest. Unlike most of them, you have a reference system and a dedicated, acoustically treated listening room. You also have the experience with luxury brands and a lifelong commitment to music that few others possess. Your inciteful, beautifully written reviews celebrate our little industry’s accomplishments. Karen Sumner – Founder – CEO of Transparent Audio
  • Matej Isak is one of the very few industry writers I feel worth taking the time answering the questions for his well-curated interviews for his readers, and he never failed asking smart questions outside the ‘audiophile box’. Having a reputation as a reviewer of describing and writing both emotional and technically well explained in the details, backed up by decades of experience and – first and above all – solid knowledge about audio technology and even producing music himself (not many know that fact), I always consider him for collecting feedback, exchanging experiences and update myself here with the maybe freshest industry news in the audio business. Jörn Janczak – CEO and Owner of Tidal Audio
  • A tremendous amount of information about what is happening within the audio industry gathered into a single website and followed by many, many enthusiasts and professionals. Last but not least, communication with the team from Mono & Stereo is easy and straightforward. Matej Isak can be proud of what he has built! Florian Cossy – CEO at CH Precision
  • Matej Isak of Mono and Stereo is one of the few audio reviewers, which do their job with passion and emotions, like he is choosing equipment for his own audio system. Flemming Rasmussen – Founder of Gryphon Audio
  • Mono and Stereo truly has their finger on the pulse. It is refreshing to come across a person such as Matej Isak who, with such honesty and enthusiasm for both music and equipment, has become instrumental for those who like to be informed. Our hearty endorsement to such a fine project! Robert Koch – Founder and owner of Robert Koda
  • Matej Isak, Has single handedly done, what Gordon Holt of Stereophile and Harry Pearson of The Absolute Sound did in the past, with the printed word, in that of todays cyber domain of digital publishing, with the same passion and power of observation. Kavi Alexander – President at Water Lily Acoustics
  • In this world where everything goes so fast, there are still people who take the time to do the things with rigour and consciousness. This is the case of Matej Isak, true Ambassador for the audiophile community, which always takes the time to test new equipment, with the passion that is known of him. Hervé Delétraz – Founder of darTZeel


Over thirty years of active exploration in high-end audio have led me to discover and connect with many brands, people, and products, bringing both joy and disappointment. These experiences have unmistakably shaped my vivid perception of audio, music, the high-end industry, and manufacturing.

Driven by continuous curiosity and passion, as a devoted music and high-end audio enthusiast, I am always keen to explore unique products that intimately reflect the extraordinary world of music – carefully engineered creations that convey music with maximum impact and clarity, deliver unwavering reproduction, and push the limits of what is possible.

The vast daily readership of Mono & Stereo – including audiophiles, audio connoisseurs, manufacturers, distributors, dealers, music lovers, and owners of high-end audio components – confirms that there are still people who trust in the knowledge, efforts, and heritage of the high-end audio industry. These individuals and companies not only recognize and respect true artisans and experts but also actively invest their time and funds in high-quality audio products.

High-end audio became increasingly personal, with strong connections developing between customers, distributors, dealers, and manufacturers. Honest customer service, quality products, and satisfied music lovers are the true keys to the high-end community’s mutual existence and satisfaction, now and in the future.

After years of listening to and testing many audio components, I can conclude that only those who deeply love, respect, and understand music strive for the absence of a specific sound imprint and seek to balance natural, transparent, and lifelike sound in their audio products.

Ultimately, the goal of audio and music reproduction is quite simple. Duke Ellington’s famous quote sums it up beautifully: “If it sounds good, it’s good!”

It is always a joy to find such exemplary devices and to meet the people behind them.

For further insights, please see the references in the top menu and visit the dedicated sections at the end of the website. Happy reading and listening!