Sennheiser AVX-835 on test
Sound is one of the aspects that makes the difference in high-quality audiovisual productions. The product that we are presenting today makes technology available to us with two fully achieved objectives: outstanding results and maximum ease of use.
Before I go any further, let us briefly review some of the reasons that have led us to where we are today. Technology is constantly evolving and the growth of some of its sectors may sometimes limit others. In this case, wireless microphone systems have fallen victim to mobile data transmission. That is, the famous “digital dividend”.
We all remember well that not so long ago we had to retune our TV channels due to a change of frequencies. This change was the result of EU regulation of around 2010, reallocating the high part of the UHF band. Analogue television needed a UHF channel for each TV channel, while digital transmission of DTT can broadcast 4 TV channels for each UHF channel. TV didn’t need so much bandwidth, mobiles do.
In this way, the former TV channels 60 to 69 of the UHF band are no longer used in television broadcasting. Since 2015 they are used for mobile data transmission, as part of the famous “4G”, which enables significantly higher data rates for a larger number of customers.
This is all well and good but, what does it all have to do with my microphones? It has a lot to do, it is extremely relevant. Why? Because the spacing between TV channel frequencies was used by most wireless microphone systems. Especially by those offering higher quality and many of them worked in the highest part of the band, which provided the best dissemination, reach and penetration. So we have to be careful about older systems, because one of these days they may be affected by 4G mobile interferences, and they will become hardly usable. Or even useless. But others won’t if their operating frequency is between TV channels 21-59, or if they use a very different band, as is the case here. To avoid doubts, we will include at the end a chart.
This regulatory change has meant that since 2010 manufacturers have marketed new models, changing the carrier frequencies of those systems that required it, to make them compatible with the new radio scenario. And theoretically for several years now nobody is selling products with this range of channels.
Building on that issue, manufacturers have used all available technology in order to develop much more efficient, versatile and easy-to-use systems. In the case of Sennheiser’s new AVX family, they have moved the frequency band to a very different range, specifically to 1.9 GHz band, in order to avoid current or future complications. Many of us still remember the hard work of matching frequencies on transmitter and receiver, and readjusting pairs when having more than one system in the same room. Or suffering from interferences due to frequency proximity. In this new frequency range, due to its new features, it is something we will forget about.
As we are about to see, this all has changed and in the case of the product that we have had the chance to test, one of the latest models of the German manufacturer Sennheiser, we have found ourselves with the quality and reliability that one would expect, plus some pleasant surprises.
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