You can only get a sub signal IF:
1. There is an LFE signal in the source. Many broadcasts and discs do not.
2. You set your main speakers to SMALL in the setup menu. Otherwise, you will only get LFE and that may not be noticeable to you.
Have you gone through the complete setup of the AVR including level calibration?
(You do not state the model of receiver or the speakers, so more specific recommendations are not possible.)
1. There is an LFE signal in the source. Many broadcasts and discs do not.
2. You set your main speakers to SMALL in the setup menu. Otherwise, you will only get LFE and that may not be noticeable to you.
Have you gone through the complete setup of the AVR including level calibration?
(You do not state the model of receiver or the speakers, so more specific recommendations are not possible.)