Subwoofer not working on PC

[LukeMay]

My friend gave me 2 speakers and a sub that goes with them. The 2 speakers work, but the sub won't output any sound. I'm sure it's an old set up, they're Klipch THX Lucasfilm. I'm using Windows 10 (might be an issue with how old these might be) and Realtek audio software. I just have my stock soundcard on my MSI Z97 motherboard. If someone could walk me through how to see if it works and get it working that would be great! Thanks!
Setup

back of sub

 

[Lutfij]

Can you take a better picture of the second image/back of the subwoofer? How are you connected to your 2.1 sound system? Might I also ask what your full system's specs are?

 

[Alabalcho]

Your PC is not at fault. You want to make sure these speäkers work with eg your phone / iPod / media player.

 

[jsmithepa]

OK, this is the old style sub-satellites. To use this puppy, you send the stereo signal (L+R) to this sub box with an appropriate cable, then configure Realtek for 2.0, LARGE speakers.

 

[LukeMay]

Can you take a better picture of the second image/back of the subwoofer? How are you connected to your 2.1 sound system? Might I also ask what your full system's specs are?

Sorry for the delayed response, I've been busy with school . My full specs are
Motherboard: MSI Z97 Krait Edition
CPU: Intel i7 4790k
GPU: NVIDIA GTX 960
SSD: Samsung 250gb
HDD: Western Digital Blue 1TB
PSU: 650W Corsair

I'm connecting using one 3.5 mm jack into the back of my PC and using Realtek Audio Software.

 

[LukeMay]

OK, this is the old style sub-satellites. To use this puppy, you send the stereo signal (L+R) to this sub box with an appropriate cable, then configure Realtek for 2.0, LARGE speakers.

How do I go about doing that? I see no option for 2.0 or large speakers on my realtek.

 

[jsmithepa]

What are the choices under 5.1 SPEAKER? You don't have 5.1, you got 2.1.

No Center, No Rears.

No Subwoofer, in your case it means your subwoofer will NOT be connected to the Mobo's SUB OUT jack.

LARGE = Full Range, same thing.

 

[LukeMay]

What are the choices under 5.1 SPEAKER? You don't have 5.1, you got 2.1.

No Center, No Rears.

No Subwoofer, in your case it means your subwoofer will NOT be connected to the Mobo's SUB OUT jack.

LARGE = Full Range, same thing.

So what do I need to do to get it working? There is no 2.1 option in my Realtek

 

[jsmithepa]

Once again, please drop down that 5.1 SPEAKER selection, and tell me what are the other choices.

 

[LukeMay]

Once again, please drop down that 5.1 SPEAKER selection, and tell me what are the other choices.

Stereo
Quadraphonic
5.1
7.1

 

[jsmithepa]

Please select STEREO.

5.1=6 speakers total, L+R (front), L+R (Rear), Center, Sub.

2.0=2 speakers total. Here we are lying a bit because of how your sub is wired.

so PLEASE STEREO, FULL RANGE.

 

[LukeMay]

Please select STEREO.

5.1=6 speakers total, L+R (front), L+R (Rear), Center, Sub.

2.0=2 speakers total. Here we are lying a bit because of how your sub is wired.

so PLEASE STEREO, FULL RANGE.

I had it on stereo when I first got the speakers and it still didn't work. I looked up some solutions and some of them said to try 5.1 and disable the speakers you don't have. Is there any effect to what slot I put the jack into? I'm not even sure if the sub works
Update: just tried stereo and sub still isn't working

 

[jsmithepa]

It's entirely possible the sub is broken but first (1) You have to make sure you are playing a sound track with plenty of LFE (Low Frequency Effect) that stuff below 80 hz. The picture you show is kinda dark, is there a sub gain control? turn it all the way up. Is there a cross-over knob, set it to 80.

I have people here posting why their surround doesn't work and it turn out they are relying on a surround test track from youtube, and youtube doesn't send you surround, time wasted.

so play something WITH KNOWN, PLENTY LFE.

 

[LukeMay]

It's entirely possible the sub is broken but first (1) You have to make sure you are playing a sound track with plenty of LFE (Low Frequency Effect) that stuff below 80 hz. The picture you show is kinda dark, is there a sub gain control? turn it all the way up. Is there a cross-over knob, set it to 80.

I have people here posting why their surround doesn't work and it turn out they are relying on a surround test track from youtube, and youtube doesn't send you surround, time wasted.

so play something WITH KNOWN, PLENTY LFE.

All of the bass comes out of the speakers instead of the subwoofer. The Subwoofer still isn't playing anything. I'm sure the frequency is low enough that it should be playing through the sub. I used spotify soundcloud and itunes.
Heres some kind of knob:

There are no knobs or buttons on the subwoofer except for the on switch.

 

[jsmithepa]

Problem. I didn't expect to see the subwoofer gain control here.

Feel like posting a diagram how the wirings, EXACTLY goes?

 

[LukeMay]

Problem. I didn't expect to see the subwoofer gain control here.

Feel like posting a diagram how the wirings, EXACTLY goes?

Here's the diagram from the online owners manual. Not sure if it's for this exact model but it's the same for my speakers.

And here's a link to the manual in case it could be useful http/images.klipsch.com/ProMedia21OwnersManualRev2012_635042122162050000.pdf

 

[jsmithepa]

OK I can live with that.

So it's entirely possible something wrong with sub, but again, I would make sure am playing a track with known LFE, you can put your hand on the sub's cone to feel *any* vibration, if dead still, the sub is broken.

 

[LukeMay]

OK I can live with that.

So it's entirely possible something wrong with sub, but again, I would make sure am playing a track with known LFE, you can put your hand on the sub's cone to feel *any* vibration, if dead still, the sub is broken.

Is there anyway to repair the sub? If I were to open it up what would I be looking for?

 

[jsmithepa]

My first guess, blown PSU, look for blown fuse.

 

[LukeMay]

My first guess, blown PSU, look for blown fuse.

How do I go about doing that? What exactly is a blown fuse?