Translation from the Rotel RX 450 spec sheet:
Model FM / AM stereo receiver <Audio part> Music power (IHF) 80W (4Ω) 60W (8Ω) Effective output 20W / 20W (8Ω) Harmonic distortion rate (1kHz) 0.3% (15W when output) 0.2% (at the time of 1W output) Intermodulation distortion (70Hz: 7kHz = 4: 1) 0.3% (15W when output) 0.2% (at the time of 1W output) Frequency characteristic (at the time of 1W output) 15Hz ~ 50kHz +0 -1.5dB Output bandwidth characteristic 25Hz ~ 30kHz Damping factor 30 (8Ω) Aux rise time 2.5μs (10kHz) Phono overload 70mV (1kHz) Phono equalizer 50Hz -13.5dB S / N ratio Phono: 60dB or more Aux: 70dB or more Residual noise 1mV below Input sensitivity / impedance MAG: 3mV / 50kΩ Aux: 200mV / 100kΩ Tin: 400mV / 15kΩ Tone Control Bass: ± 13dB (50Hz) Trebel: ± 13dB (10kHz) Loudness control 50Hz Speaker impedance 4Ω ~ 16Ω <FM tuner part> Reception frequency 76MHz ~ 90MHz Antenna impedance 300Ω balanced / 75Ω unbalanced Sensitivity (IHF) 2.0μV Harmonic distortion rate (400Hz, 100% modulation) mono: 0.5% stereo: 1% S / N ratio of 65dB or more Image interference ratio 50dB or more Spurious response 80dB Intermediate frequency interference ratio 80dB Capture ratio 3dB Selectivity (IHF) 45dB Sub-carrier suppression ratio 40dB Stereo - mono auto level 50μV De-emphasis 50μs <AM tuner part> Reception frequency 535kHz ~ 1605kHz Practical sensitivity 25μV (S / N = 20dB) Image ratio (1MHz) 60dB Intermediate frequency interference ratio (1MHz) 50dB S / N ratio of 50dB <General> Semiconductor used Transistor: 40 pieces FET: 1 piece Diode: 21 pieces Power supply voltage AC100V, 50Hz / 60Hz Power consumption 140VA Dimensions Width 435 × height 130 × depth 320mm Weight 7kg