Auto on sensitivity low and early timeout to standby mode.
I have to turn volume up to uncomfortable levels to get the sub to trigger on. It will then timeout prematurely when bass content is anything but monstrous. Is there a way to jumper something on the circuit board to overide the auto-on/timer circuit so I can manually turn the sub on and off with a power strip? Sunfire won't give me access to schematics or any technical advice.
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Some/most Sub Woofers have a Switch that turns them Off/On/ or Auto. On Auto, the Sub only turns on when there is a signal present. ( sound coming into the Sub ) When there is no signal, the sub goes into standby mode. Wireless subs may be made to be in standby mode as the default.
The sub settings for testing should be: Crossover frequency - Max; Volume - Mid; Phase - Normal.
As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay or not.
If you've got power then that's a good thing. It could be something simple as a broken solder joint or bulging capacitor.
I manage to slove to my DPX-U5120 Subwoofer level adjustment. In STANDBY mode, Press the Main Volume button and turn to Setting, turn until you find the SW Preout, Swith to normal mode, its won't work if u switch to REAR
Go back to CD/USB Mode, Then Press the Main Volume and find Audio Adjustment and now u can find the Subwoofer Level , Sub Phrase and Sub LPF adjustment.. Um Glad i found this and Happy Setting
Have you tried changing the Auto Standby switch to ON?
You can prove if the sub amp will respond to a known good input by TURNING ITS VOLUME DOWN tp start and just feeding it ANY RCA output from the receiver while playing, say, FM (to keep it simple). That way you would known in which direction the problem actually lies (internal or external).
Sounds like you are running your subs at to low of ohm. Amps are rated differently on the levels of ohms or resistance that they can get to. If you have a dual 4ohm sub and run it in pairrell it will drop to 2ohm and if you run the same sub in series it will be 8ohm. Your amp will go into protection if the ohm is to low.
I have the same problem. I saw on another forum that you can plug the sub cable into the "tape out" and it works. It did work for me but now the volume control doesn't control the sub along with the other 5 speakers. Not sure what else to do...
The receiver automatic speaker set-up set the sub volume at -12 and since it was not getting any signals from the receiver it was doing what it is supposed to be doing (going to the standby mode). This was troubleshooted by Onkyo tech support on a Sunday. All the best about Onkyo customer support.
Suggest turning the volume down on the Receiver/Amp before changing modes. Changing modes can produce signals that can hurt speakers if driving at mid-high levels.
Regarding the sub, turn off the receiver first, then turn off the sub. When turning everything on, turn on the sub first, then the receiver. If you still hear the noice in the sub, turn down the volume in the sub before turning it off (making note of what volume level you prefer for it when it is on).
Make sure that you are using the right Guage wire for that installation. I had the same problem with another amp. I changed both, power & ground wires to 4 Guage and it worked fine after that. maybe that would work for you.