Bugs 164 Posted December 4, 2020 Share Posted December 4, 2020 OK, this is the story. My Yamaha RV 2087 7 channel AV receiver has been installed in the man cave for 2 channel music listening, running a Dennon cd player and a Yamaha DAB tuner in to a pair of JBL bookshelf speakers, all this works fine. So I decided to hook up and old 12" sub to the system for obvious reasons. Anyhow no luck despite swapping cables, sub output connections on the back of the amp, even dragged out my new SVS unit but to no avail. Hooked up a TV to it and went through the procedure of designating the front speakers and the sub, no other speakers hooked up, tried various adjustments, failed again, was wondering if the sub only kicks in if using multi channel media. What have I done wrong, the receiver worked ok before it was replaced buy a new Yamaha 9 channel amp earlier this year. Thanks Link to post Share on other sites
Bunno77 1,365 Posted December 4, 2020 Share Posted December 4, 2020 Is the sub out turned on in the Yamaha's menu? Link to post Share on other sites
VanArn 611 Posted December 4, 2020 Share Posted December 4, 2020 It may help to identify the brand of subwoofer and even the plate amplifier that it uses. There are age related problems with many plate amps and often replacement is cheaper than a repair. Link to post Share on other sites
Bugs 164 Posted December 4, 2020 Author Share Posted December 4, 2020 The sub was turned on in the menu, and both subwoofers worked ok yesterday in the other room Link to post Share on other sites
VanArn 611 Posted December 4, 2020 Share Posted December 4, 2020 If the plate amplifier has speaker line inputs use these hooked up to the left and right speaker terminals of the amplifier. It may just be a case of needing more signal with LF content to drive the sub. Link to post Share on other sites
Quark 855 Posted December 4, 2020 Share Posted December 4, 2020 Are your main speakers set to Small in the AVR? You generally need this for the sub to be active in stereo. 1 Link to post Share on other sites
Old Man Rubber 382 Posted December 4, 2020 Share Posted December 4, 2020 If you set the output to 2 channel on some Yamaha amps (and some Denon too) it doesn't use the sub regardless of whether it's turned on. It's meant as a "purist two channel" approach to listening to music but really it's just confusing as all getout. Have a look through the DSP menu and see if there is an option for making sure the sub is engaged in two channel mode. If you select multi stereo on the Denon in my lounge it fires up the sub but doesn't use the centre channel. It's about as close as I can get it to unprocessed stereo. 1 Link to post Share on other sites
Bugs 164 Posted December 5, 2020 Author Share Posted December 5, 2020 Yes, I think that could be the issue, [ no sub activation for 2 channel stereo] also the plate amp only has input speaker terminals so I can't feed the speaker wires through it from the receiver and on to the speakers them selves, also set the speakers to small but no difference Link to post Share on other sites
dr_carl 193 Posted December 5, 2020 Share Posted December 5, 2020 Connecting your sub via speaker terminals is done in parallel, I.e. two leads emerging from each binding post at the amp - one pair to speakers, one pair to the sub. If your sub has not died that will work. Link to post Share on other sites
Bugs 164 Posted December 5, 2020 Author Share Posted December 5, 2020 Update !, looks like I had a win, changed the output from the receiver from sub, to no1 sub and to the left input on the plate amp, toggled between straight and stereo and presto, it effi'n works! then I went back into the menu and reset the setting from small to large and it's still good, just then I noticed the Dennon was skipping tracks, changed the cd and it started to play up also . .F......K! Time for a beer, Ps thanks to everyone's input 2 Link to post Share on other sites
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