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mastering services for independent musicians

Sidonius Mastering is a professional mastering studio located in Prague, Czech Republic.

We specialize in providing high fidelity music mastering services to artists. In addition we also offer full album mastering services, stem mastering services and mixing. Our studio acoustics, equipment and our experience allow us to provide outstanding audio mastering services at affordable rates.

We offer reliable results with prices affordable even for an independent artist. Experience and creativity is essential when working with music.

Our engineer has been producing, engineering and mastering audio and musical content for over 11 years. His attention to detail and passion for audio fidelity is evident in every finished product.

Zdeněk Loučka

Founder, Mastering Engineer
Sidonius Mastering



Zdeněk is not just a great producer and engineer. He is one of the greatest audio engineers I know. Nothing beats his prices, and nothing beats a man with skills.

Iden Chio (Zaydex)
music producer
Ricky La

Work with Zdeněk is always a pleasure – good and professional atmosphere. He knows how to work with music and delivered just what I was looking for. Don’t hesitate to ask for him.

Jérôme Laby (Ricky La)
singer and songwriter
George Gromyko

Collaboration with Zdeněk started a new chapter in my career. Working with an engineer so competent allows me to focus entirely on the creative process.

George Gromyko
composer, multi-instrumentalist


1-3 songs $30
4-6 songs $25
7+ songs $20
24 hours + $40
48 hours + $20
1-3 songs $40
4-6 songs $35
7+ songs $30
24 hours + $40
48 hours + $20
1-3 songs $50   
4-6 songs $45   
7+ songs $40   

Frequently Asked Questions

What is mastering?

In short, mastering is the final preparation of a song or an album before it is released for distribution and serves as the final stage of sonic quality control by an experienced sound engineer with appropriate skills and tools.

What is stem mastering?

Stem mastering is the process of mastering where the engineer has access to multiple consolidated groups of instruments (i.e. “busses” or just “groups”) and can further level match or edit these, if necessary. This gives the engineer more options and can ultimately yield better results if more instrument specific processing or balancing is necessary.

What will my songs sound like after they are mastered?

Every song will sound different. The goal of mastering is to further enhance the sonic aspect and the emotion of the music and make sure that everything corresponds to today’s standards. Files will be returned after mastering dithered and down-sampled to 24 bit 44.1 .wav and 320kbps .mp3 files unless otherwise requested.

How should I prepare my mix before mastering?

First of all, you want to make sure that the highest peak is hitting -6dB or less before exporting your mix from your DAW software. This ensures that the material is not distorted because of digital clipping and will give us headroom to work the magic. Secondly, you'll want to remove any pre-mastering processing from the master. At this stage, the overall volume should sound low. it will be raised during the mastering process. Third, please make sure that you export a high-resolution .wav or .aiff file. We can master mp3s or sound from video, if necessary, however you will get a better final product when a high resolution file is sent for mastering. As a last step, please check the rendered file for clicks and pops before sending it.

Do you offer discounts for full albums or EPs?

Yes. Our rates per song vary depending on the number of songs that are submitted. Please see the rates for more information.

How long will it take before my song(s) are finished?

Please see our rates for information on current turnaround times.

Can you master for vinyl?

Yes, be sure to let us know that the record is going to be cut to vinyl or a different medium as there are changes that need to be made in order to get the best quality.

How to prepare stems for mastering?

We find that creating groups containing the vocals, the bass instruments, the drums and the remaining instruments is ideal. Please include a reference bounce of the final mix so that we can check that the stems are complete.

Do you offer a free sample master?

Due to scheduling constraints we cannot offer free sample masters. We do guarantee you'll be happy with your mastered audio.

contact us

Sidonius Mastering
Zdeněk Loučka
TIN: CZ9804090285