Quite impressive, isn’t it?

Let’s talk about the numbers first

Online Mastering Services, dedicated Room and best Mastering Gears, Professional Customer Service, Affordable Prices and skilled Mastering Engineer.


Artists and producers in the last nine years. Various music and from all around the globe.


Stems. From wav to mp3, all securely stored on Cloud, thanks to Dropbox.


Mistakes and bugs edited and repaired.


Members in our team. Engineer, assistant engineer and cat.


Years of experience. Always learning and improving our skills.


Cups of coffee. Small espresso or large Starbucks, if it works we don’t care.

What we do

Affordable audio mixing and mastering services for independent artists, producers, mixing engineers, recording studios and labels..




The Studio specialises in offering high quality mixing and mastering services, which include mastering dance music (EDM), techno mastering, hip hop, reggae, indie, folk, pop, rock, dubstep mastering, jazz, mastering house, soul and funk music. We also do not shy away from the other music genres though, if you are looking for an engineer, who can efficiently handle your death metal, or country album – you do not need to search any further. Please visit our audio samples section to find examples of our professional mixing and mastering work.

We are very proud to offer the best customer services; our clients leave our studio being very happy. Can give you some more information about how we approach music of our clients. Our samples section is refreshed every few weeks so don’t forget to visit us more often and check the new samples!



There are four crucial elements that should be a staple of any professional studio, designated for providing audio mastering services online.


  • Flat and accurate monitoring system.
  • Made-to-measure acoustic treatment.
  • Skilled and experienced Mastering Engineer.
  • Highest quality analog and digital tools/processors


Here at 603 Studios we have all of the best mixing and mastering services. We also use some of the best mastering gears and digital tools carefully selected over the years to bring best online mastering service. They help us to deliver high quality audio masters.





Our Studio


Our acoustically treated mixing and mastering room has been specifically designed to create the perfect listening environment for professional mastering music. We spent years on improving quality of room so that it can provide optimal mastering and mixing services. It has made-to-measure the auditory treatment resulting in a clear and precise sound every time, allowing us to really hear the song that we are working on. This means that not only are we able to pick out even the tiniest of details, but coupled with our state of the art equipment we are able to produce masters that will sound great on any system time after time.



Mastering Equipment


Our mastering and mixing services have managed to acquire such impeccable popularity because we use some of the best digital and analogue mastering equipment. These have been specifically chosen over the years to function well with the studio and for generating the best possible results. Full range high end mastering monitors are as much important as acoustically designed room and high end monitoring DAC (mytek 192 dsd mastering edition). Please read more here.



Mastering Engineer


Our Studio is very privileged to have a full-time on-site Mastering Engineer, Robert Masny. Robert has been focusing on professional mixing and mastering for many years and has previously worked as a producer, recording engineer and mixer. He is also know as musician who plays guitar and bass guitar, and still makes his own beats.

Having such varied experience is extremely beneficial when it comes to music mastering and audio post production, and having worked in the music business for over 10 years, Robert knows every stage of music production inside out, allowing him to instinctively pinpoint any problem with your mix and advice of the best way to fix it.

Excellent Acoustics and Equipment

Great Customer Service

Competitive Rates

Fast Project Turnaround

Direct Engineer Communication

A+ BBB Rating


 What we offer

Online Audio Mixing and Mastering Services 



Our offering as a professional music mastering studio are as follows:


  • Online Mixing
  • Mix Feedback
  • Mix Review
  • CD Mastering
  • Premastering for Vinyl
  • Audio Post Production/Audio Editing
  • Stem Mastering
  • DDP Master
  • Red Book
  • Mastering for iTunes –MFiT






Stem Mastering


With respect to professional mixing and mastering services, stem represents an instrument or a group of instruments so that you can control the changes you make to each sound individually. A mastering engineer will usually work with a few stems which, when added all together at equal volume, will create a whole sound as though it was simply a single stereo file.


How many stems the mix is broken down into depends entirely on the clients’ and producers’ needs and can range from two stem mastering, where it will usually be the vocals and the backing track, or it can even include a stem for each individual instrument.


As each stem can be manipulated and adjusted individually without compromising any of the other sounds/stems, this gives the engineer more control and makes it far easier to fix any faults in the mix, as well as apply any artistic influence that may be wanted by the client.


Stem mastering is almost an in-between mixing and mastering services and is not chosen as a standard service, as it is more costly and involves more work. Stem mastering is usually not needed and may be required in the case where, for example, only one track has issues that need fixing. It is also a useful service if a client cannot afford a mixer as well as a mastering engineer – in that case, they can use stem mastering, which will cover some basic aspects of mixing and provide a clean final master.


While stem master has many benefits, having access to stems can also result in changes that the client may not like. Receiving one stereo file usually stops this happening as the engineer cannot make changes to the individual stems. But if the client wants changes or some form of artistic input, then stem mastering can be the answer. If you have any queries or questions regarding stem mastering, please get in touch with us and we will be more than happy to help.



Professional Music Mixing & Mastering Services at an Affordable Price


All our audio post production services are offered online. Mastering and mixing services online makes them much more affordable than the traditional attended sessions. The audio mastering services online are perfectly tailored, in accordance with the needs of the clients and that too at a smaller budget. Although there is no face-to-face contact, we are always available by phone and e-mail. Contact us to discuss any queries you may have about our online mixing and mastering services or to seek any technical advice.


Understanding clients’ requirements is crucial in producing audio masters that have the potential of meeting their expectations. The more pointers about your objectives you can provide, the closer the finished product will be to what you had envisioned. With that in mind, we created a Job Order form. It is an invaluable help in determining our approach to your music.


We are noted for offering fast and on-time delivery of online mixing and mastering services. This is very crucial and rare in the music business, where things tend to be left till the very last minute with deadlines looming. That is why we proudly offer an option for a super fast delivery, with an approximately 24h turnaround.


If you are new to our audio services please feel free to have a listen listen to the audio samples, which will give you a better idea of what can be accomplished our online audio mastering service. We also invite you to have a look at  the client testimonials and reviews, which show our commitment and passion in providing only the best service. If these still do not entirely convince you to use our services, we would recommend ordering a free sample to really hear what our Mastering Engineer can do, and to see how we can make your music sound at its best.


To further improve the quality of our service we have created a short video explaining how to use Job Order. It is a unique tool that allows our clients to select a service, pay for it and upload their mixes – all in one place, making it secure, convenient and super easy!


It is also a very convenient way of checking the total price of online audio mastering service that you are interested in. Simply select the relevant service from the menu and enter the number of songs to be mastered, reviewed or mixed. Stem-mastering, CD-mastering, extra-long songs, DDP master, MFiT Master for iTunes, Red Book master, extra file conversion, etc. – all the additional extras are there. Mark your requirements and select the expected delivery date. Your price will be shown at the bottom of the page.


Why Us?


The 603 Studios is noted for offering best online mastering service.There are many reasons for which this organisation has been the top choice of a wider base of clientele. It is noted for offering optimal professional music mastering. Not only do we have some of the best equipment around, but we also have a resident mastering engineer with great experience. There are endless reasons why you should choose us for all your mastering needs, and here we have listed just a few:

–  Exceptional customer service, friendly, reliable and fast communication (check our testimonials)

–  Competitive rates and affordable prices for all services (discounts for EP and LP albums), single master £25!

–  Music mastered by an experienced, committed and skilled Mastering Engineer

–  Acoustically treated dedicated room to create the perfect listening environment

–  Top end analogue and digital equipment

–  Fast turnaround time and options to choose delivery time suited for a client

–  Easy on-line Job Order, application specifically created for our clients

Thus, it could be fairly concluded that 603 Studios specialises in providing its customers with best online mastering service.

If you have any questions, please check our FAQ or get in touch with us. If you are visiting us for the first time, please check the video manual on how to use Job Order.

The quality of our work, attention to detail and great communication with clients are some of the distinguishing aspects for which we stand to be a renowned supplier of mastering music online. They are what sets us apart and lets us fulfil our lifelong dream of making songs that great sound!

Your Partner to Success

The 603 Studios has enjoyed over a decade of operation as a production and recording hotspot for accomplished singers and rappers. Our productions have received extensive airplay on national / local TV, radio and viral YouTube videos, in addition to winning Grand Prize in multiple national Billboard Song Contests and dozens of other song contests. We would love to make your project our studio’s next success – contact us to get started today!

Want to keep in touch?

Let’s stay connected

Tell us about your project and our team will help you choose the right package for you.