Marantz NR 1402 AV receiver - Black "makes boston sub" Questions

...Boston acoustics cs-26 bookshelf speakers but i cannot get more than the deepest of bass to emit from the sub. I tried running the speakers through the sub and straight from the receive but there ...

...boston acoustics subwoofer. The subwoofer tested and sound came out of it but when i turn the system on the subwoofer doesn't work. I need help!!!! You need to make sure the sub is plugged ...