https://hermitaudio.github.io/theory/index.htmlTheory The theory of the Otala amplifiers, and thus the basis for the Electrocompaniet amplifiers, has been detailed in many papers, mostly by Matti Otala, but also by several others. At Electrocompaniet these theories were extended, and a theoretical framework for our amplifiers was established. The following pages give you an insight into both the original theories by Dr. Matti Otala, and also the theories built up in the first years of Electrocompaniet. Some of the thoughts are solely mine, however — don’t assume that Electrocompaniet of today will vouch for all I say here :-)Hugoen-ushttps://hermitaudio.github.io/theory/single-stages/index.htmlMon, 01 Jan 0001 00:00:00 +0000https://hermitaudio.github.io/theory/single-stages/index.htmlThe general idea When you design something, you’re moving your ideas and abstract thoughts into the real world. Using electronic components, they will never act exactly equal to your ideas. So the best approach is to approximate their behavior, and make them work as close to your ideas as possible. Further, if you choose your models skillfully, you will get a behavior from the device which very closely mimics what you’re after.https://hermitaudio.github.io/theory/open-closed-loop-frequency-response/index.htmlMon, 01 Jan 0001 00:00:00 +0000https://hermitaudio.github.io/theory/open-closed-loop-frequency-response/index.htmlThe open-loop frequency response is the frequency response of the amplifier with no feedback — before feedback, or with the feedback network deliberately broken. The closed-loop frequency response is the frequency response of the amplifier with feedback. These two are closely related. The theoretical closed-loop frequency response is equal to the open-loop frequency response times the amount of feedback. If you have 40dB (100 times) of feedback, and an open-loop response of 1kHz, the closed-loop frequency response is 100kHz.