How do I connect my computer to a 7.1 stereo?

Remove the rear channels, unplug the wires from the digital output holes, linear input holes, and microphone input holes, and then insert them into the headphone holes to connect to 7.1 audio. As you can see in the picture below, you need front, surround, center and subwoofer to be 7.1 channels.

A 7.1 system setup uses 4 surround speakers. For an optimal 7.1 setup, the SBLs and SBRs should be set to direct firing mode and placed together on the wall located in the back. This allows the THX Advanced Speaker Array, or ASA technology to deliver its best. If the SBLs and SBRs cannot be placed together, refer to the THX Setup menu of the preamplifier or rear amplifier for a compromise solution to maximize your system's potential.

The role of the 7.1-channel system is simply to establish a set of front and rear sound field around the listener's relatively balanced sound field, different from the 5.1-channel sound field is that it is based on the original increase in the rear of the center field channel, but also different from the ordinary 6.1-channel sound field, because the 7.1-channel has a dual rear center, and this dual rear center of the biggest role is to prevent listeners because the emperor did not sit in the listening position. not sitting in the emperor's seat and produce a soundstage deviation in the hearing.