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Xonar STX + M-Audio AV40 + Polk PSW10 sub...How to connect it all? Update: Connected! - Page 2

post #11 of 22
Thread Starter 
This would be easy if I was connecting this setup to my X-Fi Fatal1ty. It has minijacks for Left, Right, and Subwoofer. But I was hoping to get the 2.1 running off of the Xonar STX.
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post #12 of 22
Quote:
Originally Posted by coelacanth;13592725 
This would be easy if I was connecting this setup to my X-Fi Fatal1ty. It has minijacks for Left, Right, and Subwoofer. But I was hoping to get the 2.1 running off of the Xonar STX.

Unless the sub has its own amplifier and two speakers input then that would be a big no. They are made for sound processing not amplification.
post #13 of 22
Quote:
Originally Posted by Crag;13590353 
wow.............thats tough:headscrat

not letting you down friend , i did some search and found this:

_What you have is a subwoofer with a passive connection. What your stereo expects you to have is a powered subwoofer that has either a built in amplifier, or a subwoofer that is connected to an amplifier.

First off, you are probably wondering if you can connect the subwoofer to the RCA output with some kind of adapter. The answer is yes, BUT the volume that comes out of the sub is so low that it is barely audible, if at all. You won’t damage anything, you just won’t be able to hear any sound from the sub and it will be useless.

The reason for this is that the RCA subwoofer connection of the back of your stereo is meant for an a subwoofer that has an amplifier either built in to it, or a subwoofer that is connected to an amplifier. Either the subwoofer with the amplifier built into it connects directly to that RCA port (the subwoofer it’s self will have a connection for an RCA cable), or an amplifier connects between the subwoofer and the stereo through that RCA port.

But don’t worry, all hope is not lost, you have two options.

OPTION A) What you could do is go to your local Radio Shack or Walmart and buy a cheap amplifier for your subwoofer. If you have money for something expensive, then I suggest just buying a whole new subwoofer that has an amp built in.

OPTION B) The other option, and the one I tend to use in these situations is to connect the subwoofer to either the left or right speaker output, just like you did for your other right and left speakers using normal stereo wire. Now you are probably wondering, if the right and left speaker are already connected to the right and left speaker connections on the stereo then how can i connect the subwoofer to one of these?

Well if your stereo is a good enough quality one that it has an RCA port for a powered subwoofer, then chances are it actually has at least 2 connections for the right speaker and the left speaker. One group of connections will be for an entire surround sound system. You will see the front left, front right, back left, back right, center, subwoofer, and possibly a few other connections.

There very well may be another two connections that are just plain old left and right stereo speaker connections, as you would see on any old stereo. You can connect your subwoofer to either the left or right one of these. You may have to play with your stereo settings to turn on those speaker output though.

This will work decently well, it will not sound as good as if you just went ahead and bought a powered subwoofer like your home stereo expects you to have. The subwoofer is built to only output low tones, thus when you connect to the right or left speaker connection, your subwoofer will only output the low tones from that connection and give you some bass, not great bass, but it should still enhance your movie watching experience.

_and one more thing about the Y splitter i read that its very BAD it might give you mono or even damage the main unit

hope that helped

How can a Y splitter damage the unit....? There are two type of Y splitters. One actually splits the signal into mono, having the right and left on each cable. Another type is a stereo Y-splitter and all it does is replicate the signal into both cables.

OP, if you do not have a receiver, or a crossover, that is the only way to connect them. That is pretty much what I am doing with my BX5a + homemade subwoofer combo and it works fine. The only problem with this is that you cannot control the cutoff frequency for the speakers because you have no crossover. Therefore, I just tune the sub's crossover around the lowest frequency the speakers can go. This way the sub won't interfere with the speakers too much.

Hope this helped, and good luck with your sound system biggrin.gif
post #14 of 22
Thread Starter 
Quote:
Originally Posted by AMC;13592071 
For a cheap but not good solution get this:

http://www.vanmediainstall.com/product/splitters/RCAcomp/RCAf2RCA2xf/index.html

[ATTACH]211769[/ATTACH]

It would be better to get an active splitter although.

That's exactly what I had planned. But yea after reading this I'm getting the feeling that this is not a good idea. Awesome drawing btw.

Maybe I'll just get a receiver and hook the Xonar up to up with SPDIF and then connect the speakers to the receiver.
Edited by coelacanth - 5/22/11 at 11:20am
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post #15 of 22
Thread Starter 
Quote:
Originally Posted by Spooony;13593873 
Unless the sub has its own amplifier and two speakers input then that would be a big no. They are made for sound processing not amplification.

The sub does have its own amp:
Polk PSW10 - Single 10-inch subwoofer with built-in high-current amplifier for big bass.
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post #16 of 22
You have to use a y splitter. It's not going to break anything.
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post #17 of 22
Quote:
Originally Posted by machinehead;13605958 
You have to use a y splitter. It's not going to break anything.

That will half the resistance to the line out on the soundcard, in turn it will attempt to output more power. True enough it *should* handle it OK, I'd keep the soundcard volume a bit lower though, although I've never needed more than 50% on my STX anyway.

There are "Speaker level to Line level" adapters that would allow you to use the subs crossover and connect the powered speakers to that, I just have no idea how effective they are.
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post #18 of 22
The RCA output voltage will be lower than without a Y splitter attached however on such a short run of cables its not a big deal.
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post #19 of 22
Thread Starter 
The Frankenstein setup works!

This is how I set it up (see the picture). I used Y splitters to split each RCA output on the STX into two.

I set the "Low Pass" on the sub to ~100Hz and it's only outputting the stuff in the low range, just as I'd hoped. The setup sounds amazing.

Thanks everyone for all the help, this is awesome! applaud.gif
(Except I have to RMA the sub, when I plugged it in, it started buzzing and it hasn't stopped since.)
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post #20 of 22
Quote:
Originally Posted by coelacanth;13639860 
The Frankenstein setup works!

This is how I set it up (see the picture). I used Y splitters to split each RCA output on the STX into two.

I set the "Low Pass" on the sub to ~100Hz and it's only outputting the stuff in the low range, just as I'd hoped. The setup sounds amazing.

Thanks everyone for all the help, this is awesome! applaud.gif
(Except I have to RMA the sub, when I plugged it in, it started buzzing and it hasn't stopped since.)

Are you positive the sub's buzzing is a defect of the sub itself? It could be the way you set it up.
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