[pookieh]

im trying to connect a home theatre sub into my pc... i already have a sub and 2 speakers, but i want to run another sub... so... 2 subs and 2 speakers. 

I have a sound card, but idk how to make it work with another sub... 

This is the sub 
http://i690.photobucket.com/albums/vv269/pookieh44/WP_20130526_0021_zpsf0750993.jpg



and the sound card

http://i690.photobucket.com/albums/vv269/pookieh44/WP_20130526_0041_zps451f0cab.jpg

Its a asus xonar ds (https://www.asus.com/Sound_Cards_and_DigitaltoAnalog_Converters/Xonar_DS/)

 

[fraseyboy]

If you want to run two subs you will need to use a splitter so that the subwoofer output on your soundcard goes to two things. You'd also need an RCA to 3.5mm cable since your subwoofer only has an RCA input.
 
Basically you'd need one of these: http://www.bsrsoft.com/help/photos/3.5mm%20splitter.jpg
...and one of these: http://www.kenable.co.uk/images/A118.jpg

 

[pookieh]

So ya i tried that... 
http://i690.photobucket.com/albums/vv269/pookieh44/WP_20130529_0101_zps6f1a386c.jpg
 
And it just plays a constant rumble... nothing even close to the song, just blasts random tone. 

 

[fraseyboy]

Are you sure that you're plugging it into the orange subwoofer output? You will also need to set the software so it knows your speakers have a seperate subwoofer and sets a crossover in software, otherwise it won't output anything from the subwoofer output. The constant rumble probably means something is wrong with your cable. You should use either the red or the white RCA connector.