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No bass outputs to the sub in normal 2 stereo playback

post #1 of 4
Thread Starter 
I have a home theater receiver which I purchased earlier today. I have it connected via the analog outputs of my soundcard into the analog inputs of the receiver. The subwoofer is connected to the SUB OUT connector.

When I play any mp3 or videos off my computer, the bass it not being output to the sub. However, when I run a speaker test by my sound card's control panel, the bass is working fine. This tells me that there is not a connection problem, but that the sound card is not outputting the sound through the bass/center jack unless a surround sound source is played.

EDIT: the soundcard is outputting the whole range through the front left/right jacks because
when I have them connected to the AUX input, the receiver passes bass to the sub no matter what the source is (mp3 ect.)

I can't figure this out other than, thinking I have to use an RCA splitter and feed the front left/right output channels of the soundcard directly into both the receiver AND the sub, and then have another RCA splitter and connect the amps SUB OUT to the sub too.


So it seems the front left/right jack of the soundcard is putting out the full range, but the receiver is not outputting the bass to the sub because no Dolby Digital source is playing. The sub has no speaker level inputs/outputs so RCA line level must be used. Can I split the RCA cables and go from the sound card's front left/right output to both the surround inputs AND the AUX input of the receiver to bypass this problem. Or is it better to split the center/sub output of the soundcard and send the bass directly to the sub along with the SUB OUT of the receiver?
Edited by aweir - 6/11/11 at 10:20pm
post #2 of 4
Thread Starter 
Something else I just realized. When I have a source connected to the AUX input of the reciever, it will send the bass out through the SUB OUT, but this will not happen if "MULTI CHAN IN" is selected. Like I said, it seems the receiver will not output any bass to the sub when in "surround sound mode" and no dolby source is playing. Therefore I have only two options when playing non Dolby material...

1. Split the front left/right output of the soundcard into both the AUX input of the receiver and to the front channel of the surround inputs, and switch back and forth between AUX and MULTI CHAN IN mode on the receiver when I want to play a game or watch a movie.

or

2. Split the front left/right output of the sound card into both the surround input of the receiver and the sub directly. that would cause a problem because then the front channel will be playing through the sub even on Dolby material.


If you had the choice which would be the better option?
Edited by aweir - 6/11/11 at 10:39pm
post #3 of 4
Set your mains to "Large" and Subwoofer / LFE to "Both" on your receiver, your mains will produce full frequencies and your subwoofer will have output below 90Hz for both two and multi-channel applications.
post #4 of 4
Thread Starter 
Sorry, I forgot to mention, my fronts/rears are small satellite speakers. I NEED the sub output. By selecting SMALL speaker size in the receiver, wouldn't that force the bass to go to the sub?

This amp is new to me so I still have to read the manual.

Sony STR-K502P
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