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Receiver only works in Stereo Mode and won't allow use of subwoofer

When selecting Dolby or THX modes the signal turns to garbage within a short period. I will get correct signal to two speakers in stereo mode. Can't use the subwoofer for long before the signal goes bad for it even in stereo mode. Sounds like a main signal processing chip gone bad or something. I'm reasonably handy but not much of an electronics repair person. I'd appreciate any tips on how to repair. Thanks

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Re: Receiver only works in Stereo Mode and won't allow...

That sounds about right, about the audio processor IC most likly being the culprit. To repair this, a test tone should be inserted into the unit, and using an ocilliscope to trace the audio waveform through the circuit, and see where it craps out. There could also be a regulator componet from the power supply that is going out after start up and becoming intermittant. Sorry to say in this case there is no wasyy fix unless you have a schematic and the proper equipment. Time to take the unit into the reciver repair Place. Good Luck

Posted on Jul 23, 2006

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When I turn the receiver on the the TV automatically plays in stereo mode. If I channel up it will switch to Dolby surround. How do I get it to start up in Dolby surround?

Not all channels broadcast in Dolby. The receiver will automatically switch to Dolby if it detects a Dolby signal. I can't be specific about the receiver as you have not stated a model. A lot of the switching depends on what sound setting the TV is set to broadcast. What settings you have set the receiver to. Plus the connections between the two. For best sound quality connect them by optical cable if both support it.

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Our denon 1708 only play on stereo mode,no sound when it select on 7 channel.. crackling on dolby. what is the problem on that receiver? please help

The surround sound outputs outputs ic's in the remainder of the system have opened, or there is a short in the speaker wiring, check to make sure that is not the case, if okay! you will need a repairman to assess the situation.

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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

2 Answers

I can't determine the best listenmodes for DVD and particularly VCD. I have a 5.1 fazor Dali speaker system. I listen to music in 'all channel stereo'. My preference for movies would be thx. For vcd this...

The 'best' audio result will always be subjective, but when it comes to digital multichannel content, the engineers probably had it right, so I'd go with Dolby Digital, THX for movies; and experiemnt with all the others for muical content becaasse any given audio recording can yield surprising new details when you turn DSP loose on it.

Page 25 Displaying Source Information
Page 36-41 Listening Modes

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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.

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Denon receiver AVR-3300: Unstable source selection

Go over here:

I have some Denon components myself and had some problems. Ask them here, and within a day you should have solution for this problem.

Probably you have to reset the device to factory settings.

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My Panassonic SA-XR50 Receiver is not producing surround sound from either of the Optical imputs from the TV or DVDR Both outputs are stereo L and R + subwoofer How do I rectify this What settings should I...

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