Thanx for this great guide... helped me a lot.
Thanks- welcome to the forum
First, optical vs. coax, is there any real difference... i ll be using 5m of cable. Which one suffers less signal loss?? Is it worth putting an extra effort and funds to make optical output???
The only practical benefit I'm aware of for optical SPDIF is the prevention of ground loops due to lack of electrical connection between the PC and receiver/processor (assuming no other connection between the two devices other than SPDIF). If you don't have a ground loop issue, then there is no performance benefit.
Yes, coax SPDIF cables can be much longer than optical SPDIF, assuming no active cable extenders are used. No issues with coax for 5m assuming a decent quality RG59/6 cable.
Coax SPDIF is lower cost because you can use any old RG-59 or RG-6 cable or old composite RCA video cable.
So, no, it's not worth doing optical over coax in your case, assuming no ground loop issue with your PC.
Second, to what extent will the quality of used components (cable, chinch connector) reflect in the final sound quality??? Am i o.k. just buying the cheapest components???
Assuming the build quality is sufficient (connectors won't come off easily or bad solder joints), just get low cost cables. Buy from monoprice.com and you're golden and cheap
Third, i ve been trying to find the voltage of my motherboards spdifout connector but i cant find it anywhere. IT has a 5V pin next to the spdifout, so should I assume that the spdifout is 0.5V???
The 5V is to power an optical SPDIF output port- power for the LED.
Generally, for recent vintage boards, you can assume the spdifout pin is a safe voltage for external equipment, but there are always exceptions. Just look in your motherboard manual (Google or board maker website for pdf) to verify, or use a voltmeter
Is there any chance that it is 5V and that my reciever or motherboard "burns out" if i connect just the grounding and the spdif???
Again, in general, no worry for the spdifout pin, but you should verify with thte manual or some googling for your PC /mobo make/model.
I have spdif in and out pins on my motherboard.
One is labeled SPDIFI and the other just SPDIF.
So SPDIFI is spdif in, and the SPDIF is spdif out??
That would be a safe assumption, given the hundreds of boards I've used/seen over the past two decades
Again- consult the motherboard manual (google or OEM website search for mobo model number for pdf)