Pioneer receiver vsx-d510 sub not working

Check all the speaker settings very carefully - page 14 in the manual solved the problem for me when i changed my old floorstanders to small speakers i didn't realise I had to tell the receiver they were small speakers for the sub to work. This is because otherwise it tries to send the bass to your speakers because it thinks they can handle it. Hope this helps. Check all the speaker settings very carefully - page 14 in the manual solved the problem for me when i changed my old floorstanders to small speakers i didn't realise I had to tell the receiver they were small speakers for the sub to work. This is because otherwise it tries to send the bass to your speakers because it thinks they can handle it. Hope this helps.