Considering the Denon AVRxx03, Marantz SRx300, Yamaha RVXxx30RDS, maybe Sony. My hi-fi cabinet upper shelves have a max depth of approx 17cm, and the Denon amps are 171mm high. The Marantz at 164mm would just squeeze in with approx 6mm to spare!!! Or I put it on the bottom shelf (you know, where the ancient cave dwellers used to store things that were called "LPs") and knock a big hole in the back of the cabinet (thin wood back fortunately!).