Creative sound blaster Z Khz and Format problems giving no more sound

Question

Hi there.
First off let me say that i know little to none about audio, so i'm not a audiofile.
Second i have some qeustions/problems with mij Creative z soundblaster and hoped someone else has tackeld these problems and is willing to teach how to setup this sound blaster.
I'm using a Creative soudblaster z that is hooked up thourgh a toshlink cable to mij Logitech speaker set (z550) and till today al was working just fine!
But i recently read something about the (i hope i say this right) Sample rates or KHZ that can improve mij Sound quality, so i read thath the blaser z can handle up to 128 Khz or something... so i thought let's give that a try!
So in windows when right click on the speaker icon i got to playback devices and there i find 2 icons a SPDIF- Out and the Speakers icon of the creative z sound blaster.
So i went to Speakers and changed the Default format( default is 24bit, 48000) to 24 Bit, 96000 (Hz studio quality).
After this change i rebooted the computer and after the reboot al sounds where working!
So after that i decided to got The Spdif-out and go to the Supported formats page, here i unchecked the 48.0 Khz box and checked the 96.0 Khz box.
Also under Advance i changed the default format to 2 channel, 24 Bit, 96000 HZ.
Now when i pres the test button EVERYTHING WORKS, when i run the windows speaker setup thiny al 5.1 speakers react the way they supposed to react.
But when playing music or video there is no sound!
Everytime i reboot windows and start up Aimp to listen to some music, the music wil play but there is no sound! When aimp is playing and i w8 for like 5 to 10 minuts the Decoder light on mij speaker console will light up and then i will hear sound!
Normaly when i reboot windows the decoder light starts glowing imediatly now i either must w8 (this might tak hours somethime) or i go the sounds configuration and after pressing let's say 20x time the test souns button the sound start working for no reason!
So is there anyon who has these problems (oh yeah deinstalled and reinstalled driver 4 time by now so it aint the driver or mij speaker because mij ps3 aswel as mij ps4 work properly and do give me sound) or better yet know how to resolve this isseu!
Or did i not configurate the sound settings well ? please inform how i need to set them.
And oh yeah Like i said i'm no audiofile, but as far as i understand the BOX the creative z comes in, it tells me i can go up to 128 KHZ so... the 98khz Should not be the problem, the sound card should be able to do this ? right !?
So for everyone who read tis post Thank you for tanking the time to read it!
For those who replyed even more thanks
ooh yeah before i forget, if the post is a bit unclear for you pls don't hessitate to contact me or sent me mail for a more or better explenation of the problem, if you need aditional info PLS say so and i will post it

Answer 1

Set your SPDIF to default settings. The Logitech speakers will be doing all of the work DECODING what you are outputting to it with your sound card. The SPDIF is strictly digital. The setting in your "speaker" option sets up the Analog to digital conversion bit depth and sample rates. With dolby digital and DTS connect though those will output at 16 bit, 48 khz. If you were connecting to your logitech speakers with the three analog cables (green-front left and right, Black-rear left and right, and yellow-center and surround) then your setting choices in the 'speakers" applet of control panel, sounds would have an effect on downsampling, upsampling, and output quality.
Lastly, make sure to right click on the Speakers icon in the sound control panel applet and choose "set as default."