I currently have a "9.1" LG BH9540TW Home Theatre System (https://www.lg.com/hk_en/home-theater-system/lg-BH9540TW) . I would like to keep the speakers, but introduce a new receiver, like the Onkyo TXRZ730 https://www.eu.onkyo.com/en/products/tx-rz730-149155.html .
The impedance of the BH9540...