1 have a differential audio signal of 15Vpp and i need to attenuate it to 5Vpp. I need help
Agreed, and that's why I couldn't get any more specific than providing the links which I did.Unless you give us the details about the output and input impedance of the devices being considered it is not easy to advise you.
If it's uses an XLR cable and you don need an exact ratio you could just use a 10dB pad.
https://www.parts-express.com/in-line-xlr-attenuator-pad-10db--240-412
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