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Sintefex Audio - What We Do


Sintefex Audio is small innovative company dedicated to making digital audio sound better.

Over many years digital audio has developed a reputation for being superficially better than analogue recording, but often failing to generate that final magic that analogue recording brought to many classic recordings of the past. Most users of digital recording equipment resort to analogue processors for at least part of the signal chain. This is often the front end microphone amplifier, the back end mastering processing, or the channel processing done during the mix.

Sintefex Audio was founded to investigate what the magic of analogue was, and to bring it into the digital processing sphere.

Dynamic Convolution

We pioneered the unique "Dynamic Convolution" patented techniques that allows the sampling and emulation of classic equalisers and compressors. Dynamic Convolution is trademark of Sintefex Audio Lda.

These inventions first saw the light of day in our ground breaking FX8000 range of sampling digital signal processors. The units we could make were snapped up mostly by mastering engineers around the globe, allowing them to have a library of sampled analogue gear that didn't also have to suffer all the related analogue problems of noise, unreliability, unrepeatability and impossibility (often) to get matched channels for stereo (let alone surround sound).

These first mammoth machines which contained up to 40 DSPs cooperating to simulate the analogue sound led on to a new approach, to license the core technology and to develop it further for lower cost solutions. Licensed solutions included the Focusrite Liquid Channel (tm) sampled microphone preamplifier, now in heavy demand as the ultimate programmable front end, together with its 4 channel successor, the Focusrite Liquid 4 Pre (tm). We also licensed the equaliser and compressor modelling for the unique Focusrite Liquid Mix (tm), now available together with a lower cost Liquid Mix 16 (tm) and the Protools native Liquid Mix HD (tm). All these are trademarks of and exclusively manufactured by Focusrite.

Sintefex is dedicated to further applications of this patented technology, please keep an eye out here for news of these.

Consultation and Joint Development

Sintefex is also active in consulting and joint development. We can offer one-off consulting for specific products or partnerships in design and innovation leading to mutually successful product development.

An example of this innovation is the multi award winning JoeCo BLACKBOX RECORDER, a major innovation in field recording, uniquely recording from 24 to 64 channels in a 1U rack unit to standard USB disk drives as a set of standard mono WAV files in Broadcast Wave format, from 44.1kHz to 96kHz, and supporting analogue and digital interfaces including AES, ADAT, MADI and DANTE networks. These files can be directly mixed on any DAW without the need for time consuming file copying or processing. This was possible in partnership with Joeco thanks to Sintefex's innovation in digital and analogue design.

Our way ahead

We are also developing other technologies, and from time to time there will be beta test and trial items available for download. For example tQ1 by Sintefex a low overhead simple EQ, designed for use in a mixing project across many channels of a mix or recording.

Our approach is always to seek audio solutions that step beyond the expectations of digital recording. We hope you will stay with us on this journey.


Thank you for your interest in our quest, from Mike Eden (President), Mike Kemp (Technical Director) and Simon Widdowson (Hardware Development Director)...


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[Server 3] Sintefex Audio Lda is a limited liability company incorporated in Portugal. The Sintefex name and logo, and the expression "Dynamic Convolution" are trademarks of Sintefex Audio Lda. All trademarks and trade names used on this site that are not the property of Sintefex Audio Lda are acknowledged. Whilst every effort is made to ensure the accuracy of information on this site, we accept no liability for inadvertent errors or omissions. All links are provided in good faith and do not represent an endorsement of the web site addressed nor do we have any responsibility for the content of any site not maintained by us. No matter on this web site (except your acceptance of licence conditions where indicated) constitutes any offer or any form of contract unless agreed explicitly in writing with authorised representatives of Sintefex Audio Lda. Sintefex Audio, Lda, Sitio de Vale Formosilho, S.Marcos da Serra, 8375-S. Bartolomeu de Messines. Capital Social: EUR5000 -Mat. C.R.C.Silves sob o no 01376/970908 NIPC no 503951170