The key difference between analog and digital amplification is the manner in which the input signal is amplified. Put simply, with analog amplification, the analog input signal is amplified without modification. On the other hand, with digital amplification, the analog signal is converted into a pulse (digital) signal and then amplified, before being converted back into an analog signal. Generally speaking, a digital amplifier offers greater power efficiency (up to 90%) and a smaller chassis size, as there is no need for a large heat sink. Besides these advantages, Onkyo also believes it is possible to improve sound quality, as digital amplifiers have a greater ability to reproduce sound with speed and energy. This is the focus with the A-9355 digital amplifier. By countering spike noise with Onkyo’s Vector Linear (VL) Digital modulation circuit and negating voltage fluctuations through the power supply, the A-9355 is aimed at the music lover who wants to get the best out of their collection. The concept also draws on build quality that strives to take audio reproduction to its limits.