Difference between subwoofer out and subwoofer preout purple rca connectors on onkyo tx nr646 question | AVS Forum
![Onkyo TX-NR656 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos® at Crutchfield Onkyo TX-NR656 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos® at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2016/21/580/g580TXN656-B.jpg)
Onkyo TX-NR656 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos® at Crutchfield
![Onkyo TX-NR646 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos® at Crutchfield Onkyo TX-NR646 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos® at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2015/19/580/g580TXN646-B.jpg)
Onkyo TX-NR646 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos® at Crutchfield
![Onkyo TX-RZ620 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Dolby Atmos®, and DTS:X™ at Crutchfield Onkyo TX-RZ620 7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Dolby Atmos®, and DTS:X™ at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2017/22/580/g580RZ620-o_angle.jpg)