En el menu selecciona Speaker Settings y selecciona el corte de frecuencias que quieras para los altavoces en vez de Full Band, página 71 del manual http://www.intl.onkyo.com/downloads/...5_manual_e.pdf

The following crossover frequencies can be specified:Full Band, 40 Hz, 50 Hz, 60 Hz, 80 Hz, 100 Hz, 120 Hz,150 Hz, or 200 Hz. Specify Full Band for speakers that can output low-frequency bass sounds adequately, for example, speakers with a good sized woofer. For smaller speakers, specify a crossover frequency. Sounds below the crossover frequency will be output by the subwoofer instead of thespeaker. Refer to your speaker’s manuals to determinethe optimum crossover frequencies.
El corte dependerá de las características de tus altavoces, es decir hasta donde bajen con bastante volumen