The amplifier replaces a min. 20 years old, Sherwood Stereo Receiver, who has always done faithful service. After devices are not necessarily better in the course of time and have otherwise occurred some technical adjustments to the music situation, there should be a new amplifier. After extensive research (receiver or amplifier, maybe even "just" a high-quality compact system), it has now (among other things thanks to the reviews on Amazon) the Denon PMA 520 AE. What can I say, as soon as he was connected, I have - I have not really kept for possible - heard a huge difference to previously. Just buy it what value is concerned. Usability top, dimensions as it should be, heavy, large and high quality, but matches any HiFi tower with standard dimensions. Only the ON / OFF switch could theoretically say central sit up straighter, as amended. No odors by now min. 6 hours of continuous operation. All Top! Buy! Now my boxes be replaced and even then in my opinion can not keep up quality compact system more at the price-performance ratio.