I am looking at upgrading from my Series 3 to a Premier XL4.. The S3 made enough noise that I refused to put it in a room like a bedroom, how are the current Tivo XL4's noise wise? Are the current DVR Hard drives still a bit noisy or did they bring the sound levels down? And does the XL4 have a fan on it like the S3 had? If so does it make much noise? thanks!