Venkat has given a crisp answer. This table from yamaha FAQ lists all the bass redirection options available in their AV recievers.
What effect does the Speaker Size and LFE/Bass output settings on my Yamaha A/V Receiver affect the output sound?
If the individual speakers are set to SMALL within the speaker settings option of a Yamaha A/V receiver, and the LFE/Bass output is set to SWFR (Sub woofer), the LFE/BASS output that is intended for that speaker will be redirected to the sub woofer.
If the individual speakers are set to SMALL within the speaker settings option of a Yamaha A/V receiver, and the LFE/BASS output is set to BOTH, the LFE/BASS that is intended for that speaker will be redirected to the sub woofer.
If the main/front speakers are set to SMALL and the LFE/Bass output is set to MAIN/FRONT within the speaker settings option of a Yamaha A/V receiver, the LFE/BASS output would be muted. If the main/front speakers are set to LARGE and any other speaker is set to SMALL and the LFE/BASS output is set to MAIN/FRONT within the speaker settings option of a Yamaha A/V receiver, the LFE/BASS output for that other speaker would be sent to the main/front speakers.
If all speakers are set to LARGE and the LFE/BASS output is set to SWFR (Sub woofer) within the speaker settings option of a Yamaha A/V receiver, you will only get the discrete LFE (The ".1" in a 5.1 movie) signals directed to the sub woofer.
If any speaker is set to LARGE and the LFE/BASS output is set to BOTH within the speaker settings option of a Yamaha A/V receiver, you will only get the LFE/Bass output sent to set to that speaker as well as the sub woofer.
If the main/front speakers are set to LARGE and the LFE/Bass output is set to MAIN/FRONT within the speaker settings option of a Yamaha A/V receiver, you will get the discrete LFE (The ".1" in a 5.1 movie) signals directed to the main/front speakers.
NOTE:
The Speaker Size and LFE/BASS output settings do not apply to Zone 2, Zone 3 or the Multi Channel Inputs.