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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Re: subwoofer pre-out not working

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.

Posted on Mar 17, 2008

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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 & Video Receivers

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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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Htddw7600, brand new, sub amp is not working, only way to get any bass sound is to unplug the sub cable from back of main amp and touch it on side of sub out port.

You have a very good of the best of SONY..SUB does not get activated automatically especially on STEREO mode.DIRECT STEREO Notes • No sound will be output from the subwoofer.
.your system has Dedicated Power Amplifier for 2 Externally Driven Sub-Woofers (200W RMS x 2) order to activate the sub woofer amplifier you need to make a selection on the surround modes while you are switching the modes of the surround you will see the speaker position on the display of receiver as well..if you do not see the sub woofer it wont be activated..Sound Field Program (A.F.D) is a good example to test it..
Take care and please Remember to rate/vote and give me 4 Thumbs Up
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Hope this helps!

Additionally please follow the instruction on your user manual to activate the SUB ,as is follows..

Low-frequency (bass) signals can be directed to the
subwoofer and/or the front left and right speakers
according to the characteristics of your system. This
setting also determines the routing of the LFE (low-
frequency effect) signals found in Dolby Digital or DTS
Choices: SWFR (subwoofer), FRONT, BOTH
• Select SWFR if you connect a subwoofer. LFE and
low-frequency signals from other channels are directed
to the subwoofer according to the speaker settings.
• Select FRONT if you do not use a subwoofer. LFE and
low-frequency signals from other channels are directed
to the front speakers according to the speaker settings
(even if you have previously set the front speakers to
• Select BOTH if you connect a subwoofer and you want
to output low-frequency signals from front channels to
both the front speakers and subwoofer. LFE and low-
frequency signals from other channels are also directed
to the subwoofer according to the speaker settings. Use
this function to reinforce low-frequency signals using
the subwoofer when playing back sources such as CDs.

Jun 23, 2011 | Audio & Video Receivers

1 Answer

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?

Feb 11, 2011 | Denon AVR-4800 Receiver

1 Answer

No output to the subwoofer using the sub pre out RCA jack.

I'm assuming your subwoofer is self-amplified, otherwise it won't work with a preamp (rca) input.

Under Speaker Setup you have to have Subwoofer set to YES (page 16).

If you have good bass-capable main speakers I would recommend setting the subwoofer playback mode to LFE+Main, otherwise just LFE.

Beyond this we would need to know something more about the subwoofer and its controls.

Connect any other preamp out channel, like CDR/Tape OUT, to the sub and tune an FM station to see if the sub is capable of processing audio. A 'normal' audio signal would sound muffled but it would prove the cabling, amp and speaker at least function and point us back to setup as the culprit.

Dec 08, 2010 | Denon AVR-587

1 Answer

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 & Video Receivers

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

May 24, 2009 | NAD T760

2 Answers

Want to connect my RCA sub to my yamaha htr-5940 reciever

Subwoofer needs to be enabled through menu on Yamaha. LINE OUT might be turned off or Subwoofer volume set to low or off... (-db level) kinda thing...speaker wires are usually always live etc...

Feb 03, 2009 | Yamaha HTR-5940 Receiver

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Subwoofer shutdown

I'm having the same issue as pdoug: Sub rumbles in test mode, doesn't produce sound otherwise. Which makes me suspect it's the receiver itself -- the filter (or whatever) it is that should be separating the bass signal and sending it to the sub is not working. At least that's my guess.

Either way... this sucks.

Mar 14, 2008 | Kenwood VR-407 Receiver

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