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SB Audigy & Logitech Z560s. Digital signal = no sound

C

Conundrum

Senior member
Anyone have any ideas on why I can't seem to get a digital signal to produce any sound on my speakers?

Hell.. even when I turn the fade all the way to the back with the 4-speaker setup can I hear a thing with the test function in the speaker setup. I can even out the sound and it works fine for playing mp3s and in games from what I can tell. Only problem is.. shouldn't these speakers be able to work with a digital signal?

Hopefully someone here can clear this one up for me.

thx
 
As I know, there is a special digital signal coming out from a Audigy - a 24-bit 96 kHz, totally unlike the Creative Live's 16 bit 48 kHz.
Even in Creative line of speakers the older digital speakers needed to be modified to accept the new digital sound.
I owe a SB Audigy, but I have no digital speakers

to put the things very clear:
A analog signal is like a function graphic (the signal value varies from a value to another thru a continous variation)
A digitized signal is somewhat similar, but the continous variation is replaced by some "steps"- the signal values can
be only multiples of a base value (the smaller that can be represented). A CD audio signal takes only values i*STEP, where i
is 0 up to 65535 (i.e. 16 bit wide), and STEP is the "atomic" value - smallest representable.
A digital signal instead is a stream of 0 or 1 values. Taking the values in groups of 16 (for a CD audio signal - 16 bits) one will
compute every "sample" of the signal and then play it. Basically, to send a digital 48 kHz 16 bit signal, one
must send 48000*16 bits (0 or 1) on the digital line. To identify the 16-bit groups, a pause is kept between the bits.
Usually the group is prefixed and/or postfixed also with binary values of ACTIVE, to identify the null values (0000 0000 0000 0000)

UPDATE - all the data must be multiplied with the number of channel

Going to the case in discussion, there is the following problem:
The Audigy will send out thrice as many bits as a Live, so a digital speaker will ignore them.
If you will have a LED of "no digital signal" on speakers, be sure will be ON, as the digital signal from the Audigy cannot be
understood by the speakers.

If you want to be absolutely sure, ask technical support of speakers about this. Remember, this is only my opinion on the subject.

Calin

Thanks AnthraX101 for the simple explanation
 
Calin sounds right, I am not sure about his numbers.

The simple answer:

The speakers don't support a digital signal. No, you will not be able to use it with these speakers.

Armani
 
Awww man. That really blows...

I'm going to email Creative and include the information you've provided me with.

Thanks for the input guys.
 
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