HERE - Densen

21Non-Feedback technologyThe most important technical aspect of our product range is thezero-feedback technology. In the seventies Finnish ProfessorMatti Ottala discovered the importance of low-feedback.Until then all amplifiers were designed using high-feedback.Matti Ottala’s breaktrough started a lot of low-feedback designs.The benefits of the low-feedback designs compared to thestandard high-feedback designs were much faster amplifiers,better soundstage, detaillevel, transparency and so on.This led to the recognition of transistorised high end amplifiers,and the beginning of the demise of tube amplifiers among highend amplifiers.The reason that feedback is used (though in smaller quantitiesthan in the past) is that it is used to compare the input with theoutput, and adjusting the input so that the output is exactly thesame as the input. This way, at least in theory, the amplifier itselfhas no influence on the signal, as these influences will beadjusted away.The fact is that feedback, no matter to what degree, alters thesignal and the result is: Dynamics will be compressed,microdetails compensated away, details smeared, soundstagealtered, speed slowed down, transparency smeared and so on.Naturally, you will not have these problems with a zero-feedbackdesign. However, the basic design must be extremely much betterthan feedback designs, otherwise the amplifier will not be stable.We are one of the few companies in the world (the only one?)capable of doing this, and the result of this is simply stunning, thecombination of a MUCH better basic design and the zerofeedbacktechnology results in: Extreme dynamics, detaillevel,amount of microdetails, perfect soundstage, transfer speed,transparency and wide open sound.Combining this technology with the extreme care we take in thelistening tests, during the development of our products, we canproudly say our amplifiers combine perfectly high technologywith extreme musicallity.That is the reason why ALL products from Densen are zerofeedbackdesigns!Since the introduction of the first Densen amplifier all Densenmodels are zero-feedback designs. This means there is nofeedback loop in the following (whether it is low- or highfeedback).The signal always takes some time to pass through theamplifier stages, therefore the comparison of input and output isnot the comparison of exactly the same signal. This means thatthe theory that feed-back should improve sound by avoidinginfluence on the signal from the amplifier stages is simply theoryand not true!