This is a common problem with subs. Try turning up the volume on your receiver or turn the switch on the sub to "on" and then back to auto mode.
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mattg3 - I have a pair of SVS subs. I was surprised to read the subwoofer gain setting could have any effect on waking up the subs. When in "auto", mine come out of standby as soon as the music starts (i.e., as soon as the pre-amp starts sending line level signal to them) even when gain is turned all the way down. With the speakers I’m running right now, gain is normally at 9 o’clock. Not sure I understood your question about adjusting subwoofer trim at the receiver. I guess the Yamaha is a home-theater device? One very obvious thing to check is bass content of what you play that DOESN'T wake them. Could it be there is just no bass signal going to them? Does failure to wake happen with different pieces of music??
Hope you get it sorted out. Worst case, if no satisfaction from SVS (I’ll be disappointed in them), wake ’em up manually (as I’m sure you could figure out on your own! :-) Good luck.
1. Try a 'Y' rca cable connect the receiver LFE to both L/R line input on the sub, if made no difference then
2. If your AV Receiver has pre-out and you have a pair full range front main speaker, you can try connect the sub line input to the receiver front L/R pre-out, and re-configure the receiver setup to full range main L/R speakers, select ’No sub’ for the LFE channel, set the subwoofer internal low pass filter to 80Hz or lower. Hopefully the stereo full range pre-out signal will wake up the sub easier.