Question about Onkyo TX-DS838 Receiver

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Subwoofer pre-out not working

Anyone have any suggestions on fixing a bad sub pre-out?

Sub is working and tested good. Just no signal from the receiver.

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Make sure that the sub-out is actually activated. I believe that this can be disabled. Otherwise this may be a problem with the surround processing board.
Dan

Posted on Mar 17, 2008

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Posted on Jan 02, 2017

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Why is there low humming in the receiver sub channel(only?)


Sounds like a shorted capacitor in the sub out circuit.

May 04, 2015 | RCA Audio Players & Recorders

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I have no sound coming out of my sub woofer on my kenwood VR-407 everything else works great anyone have any ideas or solutions


yes it very much has everything to with it. your sub out is at a pre-amp lvl, so you can route that signal to another amp, then to your passive sub, or get a powered sub

Apr 19, 2013 | Kenwood VR-407 Receiver

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My subwoofer output is not working properly. I have a sunfire signature that worked all the time. Now the power on the Sunfire will not come. Research says no signal from receiver. I swithed the...


You can prove the sub pre-output works by running an RCA cable from it to the input of a tape deck, TV or any other device that accepts Line In and will either display it or play it. Test it on VERY LOW volume at the receiving device.


Different sub pre-out cable?

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Kenwood 107VR rec and No vol from Sub Output w/ menu Opt On


In the setup menu are the speakers set to large or small? On some receivers if you have it set to large all the bass is directed to the right-left fronts.
On my pioneer receiver if the speakers are set to large the sub-pre-out only works if the receiver is in a surround mode, if its in stereo mode and the speakers are set to large the sub-pre-out is dead. If the speakers are set to small the sub-pre-out works all the time.
Also, some receivers won't send a signal to the sub-pre-out if there is no LFE discreet signal info from the dolby digital or dts bitstreem.
For example I have several older dvd's that light up the L C R SL SR icons on my receiver, but don't light up the LFE icon. I have other older dvd's that just light up the L and R icons meaning they are only recorded in stereo like a vhs tape recorded in dolby surround.
In my basement I also have a kenwood dolby digital receiver.
I've noticed that when a dvd only lights up the left and right icons the pioneer will automatically switch to dolby pro logic surround. The kenwood will only send the signal to the left and right fronts (stereo). If I manually switch it (kenwood) to dolby pro logic I'll get sound from all the speakers just like the pioneer, but it does'nt do it by itself.
Most receivers that have a tape monitor won't work in surround mode with the tape monitor on. The pioneer will let me use the tape monitor with dolby pro-logic but won't pass through a dolby digital signal with the monitor on.
Hope this helps.

Apr 18, 2010 | Kenwood 107VR

1 Answer

Subwoofer pre-out wires


Sorry for the stupid question but is your subwoofer a powered sub? The subwoofer out is just a preamped signal that drives a powered subwoofer. Let me know then we can go from there.

Jan 28, 2010 | Audio Players & Recorders

1 Answer

Loud buzzing from Kef PSW1000 Subwoofer


yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
That is test one. if you have buzz still, its the sub assembly. bad luck, but not impossible. If the buzz is gone its one of the signals to the sub. They can produce a buzzz without any signal coming from your stereo equipment. Replace the feed line, enjoy! BTW...Kef sure does sound clean. good choice.

Nov 09, 2009 | KEF Audio PSW 1000 Subwoofer

1 Answer

No signal from sub connected to NAD T760 in test mode.


Try using front pre out to the sub from the receiver. the crossover is in the sub anyway. If this works change your settings on the receiver and test again. If sub is still inop, could be an internal issue with the sub amp. Does your sub amp have an on/auto/off switch or light? check that as well. Hope this helps, if you need further assistance, send a reply and I'll help some more

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1 Answer

Pb12 makes thumping sound after warming up


Hello there..Thats normal only if your sub volume and the pre amp is turned up..Your amp is the cause of the speaker jump..Turn amp volume sub level down a few and check your wire from sub to amp..If all of that is good is a normal operation for pre amp warm up in sub if level is turn to max..Try unplugging amp freom sub then turn sub on stand alone(just sub outlet plugged in and no wires from base amp plugged in..If sub stops the its the amp making the problem..If it still is there then the pre amp is either dusty on inside or the outlet plug that it is plugged in doesnt have a good ground..Hope these help to solve your problem..Have a great day...

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1 Answer

Infinity ps-10 powers up but no boom


Try hooking up a different signal input to your powered sub, another stereo or even a dvd players audio output to the sub will work for a test. Just make sure the subs gain is down before starting. If it still not producing sound, the subwoofers amplifier is bad. I hope this helps.

Oct 10, 2008 | Infinity PS-10 Subwoofer

1 Answer

Sub not working


The sub pre out is for a small output signal which is to send a signal to a power amplifier which amplifies this signal to a level that will drive the subwoofer. the preamp out signal is not capable of driving a speaker without being amplified.

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