Как лучше подключить это всё (наушники кабели) ? Для лучшего звучания ?

Сразу пишу звуковой карты нет только звук от мат. платы

Имеется - Steelseries Siberia 840
https://ru.steelseries.com/gaming-headsets/siberia-840

Имеется - Asus x99a usb 3.1
Информация по аудио материнской платы с оф. сайта :

Realtek® ALC1150 8-Channel High Definition Audio CODEC
- Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking
- High quality 112 dB SNR stereo playback output (Line-out at rear) and 104 dB SNR stereo playback input (Line-in)
- High-fidelity audio OP AMP(s)
Audio Feature :
- DTS Ultra PC II
- DTS Connect
- Optical S/PDIF out port(s) at back panel
- BD Audio Layer Content Protection
- Audio Shielding: Ensures precision analog/digital separation and greatly reduced multi-lateral interference
- Dedicated audio PCB layers: Separate layers for left and right channels to guard the quality of the sensitive audio signals
- Audio amplifier: Provides the highest-quality sound for headphone and speakers
- Premium Japanese-made audio capacitors: Provide warm, natural and immersive sound with exceptional clarity and fidelity
- Unique de-pop circuit: Reduces start-up popping noise to audio outputs
- Top notch audio sensation delivers according to the audio configuration
- EMI protection cover to prevent electrical noise to affect the amplifier quality

https://www.asus.com/ru/Motherboards/X99AUSB_31/specifications/