Sub not working when upconverting stereo to 5.1 on an old receiver. - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 11-20-2019, 11:02 AM - Thread Starter
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Sub not working when upconverting stereo to 5.1 on an old receiver.

Any ideas on why I can't get my sub to work when my older receiver is "upconverting" stereo to 5.1?

I have an old Pioneer VSX-D912 receiver which does not have any HDMI inputs. As a result, I've determined that it's pretty much impossible to get 5.1 sound out of a streaming device and into the receiver (all the HDMI to optical/digital options cannot handle Dolby Digital Plus). Therefore, I'm simply plugging my Roku streamer into my (also old) projector, and running the simple RCA red/white stereo cables out of the projector and into my receiver (I think in the VHS input).

I'm resigned to the fact that I won't actually get 5.1 surround sound, but it was my understanding that the receiver could take the stereo and simulate 5.1 to some degree. I turn on Dolby Pro Logic Movie option, and sure enough, the center channel starts pumping out sound.

The sub, however, is dead as a doornail. In reality, I'm 100% fine with only the R and L fronts working with no center or surrounds. My my concern is the subwooofer.

Any ideas about why the sub isn't working or how to get it working?

I'd prefer not to mess around with the speaker set up generally, as I'm happy with how the system performs with other inputs (e.g. blurays)

Any help is appreciated!

Last edited by tentaguasu; 11-20-2019 at 11:19 AM.
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post #2 of 5 Old 11-20-2019, 11:17 AM
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Are center and main speakers set to large?
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post #3 of 5 Old 11-20-2019, 11:20 AM
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As said above your speakers need to be set to SMALL in the speaker configuration setup menu. Then lower frequencies will be passed on to the subwoofer. even from stereo sources.

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post #4 of 5 Old 11-20-2019, 11:20 AM - Thread Starter
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Quote:
Originally Posted by Leeliemix View Post
Are center and main speakers set to large?
Not sure, I'll have to check when I get home. I don't believe so.

If they are, would that prevent the sub from working? (I guess perhaps by sending all low frequency to the speakers?)

Also, if I change that, would it negatively affect my normal use of the system when I do have 5.1 input?

Thanks.
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post #5 of 5 Old 11-20-2019, 11:25 AM
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Nope, will only make things work better even for 5.1 material.

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