Connections

A. Audio

Motherboards typically have these analog audio panel ports:

Left (Surround Sound)

Orange subwoofer/center out
Black rear stereo/surround (5.1) out
Gray middle surround (7.1) out

Right

Blue line level audio input; stereo in
Green line level audio output; speakers
Pink microphone

Most motherboards have a headphone header to attach to a case front headphone jack. However, since the cable runs through the computer case it tends to pick up electrical interference/noise. You can instead plug the headphones into the back panel line out/speakers, although high impedance headphones may need a seperate headphone amplifier.

The Asus ROG Strix 270e also has digital optical out and digital coax out.

My audio setup:


The back panel of the Modi DAC has optical digital in, coax digital in, micro USB in, USB (micro) power in, and RCA out. On the front it has a selector switch: USB, digital optical, coaxial digital.
The Magni headphone amp has RCA in and RCA out plugs on the back panel (as well as the power in from the wall wart). On the front panel it has a headphone jack and a volume knob.

The computer sound from the Realtek chip is outputted by digital optical to the Modi DAC which converts the computer digital data to analog sound. The Modi feeds the Magni headphone amp by RCA cables. The Sennheiser headphones plug into the Magni headphone amp by ΒΌ inch cable.
The Magni also has back panel RCA out jacks that are connected to the Yamaha receiver "audio 1" input. That allows the computer sound to be played over the Yamaha/speakers. Plugging the headphones into the Magni front panel jack automatically disconnects the rear panel RCA output.


B. Video

The aux computer uses integrated Intel graphics. Its motherboard (Asus Prime H270M Plus MicroATX) outputs HDMI and DVI-D. The Dell 2410 monitor with it inputs HDMI, Display Port, DVI-D, and VGA. I use HDMI.

The EVA GTX 1080 FTW outputs HDMI 2.0b, 3 x DisplayPort 1.4, 1 x Dual-Link DVI-D.

The Dell monitors I use are:


2715Q (1) Display Port x 1; mini DP x 1; HDMI x 1
2718Q (2) Display Port x 1; mini DP x 1; HDMI x 1

I connect the HDMI out to the left monitor HDMI in; DP out to DP on central monitor; and mini DP out to the DP in left monitor.

C. USB Connections

The Asus ROG Strix 270e has these USB back panel ports:                   connected to

1 x 3.1 Gen 2(10 Gbps) Type C
1 x 3.1 Gen 2 (10 Gbps) Type A (red)                                                    Apple Lightning cable
1 x 3.1 Gen 1 (5 Gbps)                                                                           Dell monitor (C) 4 port hub
1 x 3.1 Gen 1 (5 Gbps)                                                                           Dell Monitor (R) 4 port hub
1 x 3.1 Gen 1 (5 Gbps)                                                                           4 port hub
1 x 3.1 Gen 1 (5 Gbps)                                                                           UPS

Motherboard

1 x 3.1 Gen 2 (10Gbps)header for 2 case front outputs
1 x 3.1 Gen 1 (5Gbps)header for 2 case front outputs           I use this because my case has only 3.1 gen 1 (5 Gbps) ports
3 x 2.0 (480 Mbps) for 6 ports on back expansion cards       I use 2

Line in/out is the strength for other audio devices like tape players, DVD players, TV's, and audio mixers. Microphones and instrument pickups carry a weaker signal; headphone out and speaker signals are stronger. Since their signal is weaker, microphones typically need a preamp. Condenser microphones require power, usually from the mixer back to the microphone. Dynamic microphones use an electromagnetic coi

l.
My System