ONKYO TX-SR303. Manuals and User Guides for ONKYO TX-SR303. We found 7 manuals for free downloads: Operation manual, Owner's manual, User manual Onkyo TX-SR303 Household Appliances Digital Media Receiver download pdf instruction manual and user guide.Specifications ; Signal to noise ratio · 100dB (line) ; Output · 200mV (line) ; Digital inputs · coaxial, optical ; Dimensions · 435 x 150 x 369mm ; Weight · 8.5kg. User guide • Read online or download PDF • Onkyo TX-SR303 User Manual • Onkyo Acoustics. View and download the Manual of Onkyo TX-SR303 Audio - Video Receiver (page 1 of 56) (English). Also support or get the manual by email. View the manual for the Onkyo TX-SR303 here, for free. This manual comes under the category Receivers and has been rated by 2 people with an average of a Get Onkyo TX-SR303 PDF manuals and user guides, View all Onkyo TX-SR303 manuals. Add to My Manuals Save this manual to your list of manuals