Whats the resistance of RCA inputs?

[silentblackhat]

I am wondering what the resistance of RCA inputs are on a tv compared to the inputs of computer speakers. I am asking this because i need to know what value of resistor to put on my signal wires running from myxbox. I am converting the 2 sound rcas to audio inputs on my computer speakers(since i got a video converter to play my xbox on my computer monitor) and i heard that there is a big difference. Am i on the right track? or do i need something else than just a resistor?

[richie00boy]

I'm not sure what you are trying to do. You can't convert an output into an input.

The input impedance of the TV could be anything between 10k and 300k, as could the computer speakers. If you just want to plug your xbox sound into the TV rather than the computer speakers you shouldn't have to do anything other than swap the leads over.

[silentblackhat]

sorry i probably wasnt clear ill explain. I have my xbox playing on my computer monitor(the video). I want to have the output of the xbox sound plug into the input of my computer speakers. WHen i plug my xbox rcas into my computer speakers, it seems extremely loud even at very low volumes(just past the on poition). I am making sure that I can add a resistor in series with the 2 audio outputs of the xbox(one on each) so that it will lower the volume so its not just so loud. right now its very hard to put it at a reasonable level since by just a slight movement of the volume knob, the nolume jumps really high on the speakers.

[richie00boy]

OK I see now. You need to find out the input impedance of your computer speakers. You need an ac signal generator. You might find it easier to just try swapping a few resistors inline, e.g. 4.7k then 10k then 22k then 47k

[silentblackhat]

alright thanks, thats what i thought. right now i have 1K, and a 10K resistors so ill try those first

[macboy]

right now i have 1K, and a 10K resistors so ill try those first

In that case, make a simple 10:1 voltage divider. This will give 20 dB of attenuation. Connect a 10K and a 1K together at one end. Connect the other end of the 10K to the signal source (center pin of the Xbox RCA), and the 1k to the ground (outer shell of the RCA). Now connect the computer speakers (signal part) to the place where the two resistors are joined; the signal there is 1/10 the voltage of the original signal. (connect the computer speaker ground to the xbox ground as well, of course).