A microphone...
Digital Audio Workstation or DAW is nothing but a computer installed with software's and hardware's which enables it to record and edit audio. All Studios have DAW's these days cause everything is recorded in digital with really powerful computers. So to sum up you need a really acoustically treated studio to record sound so you need a studio which has a DAW.
Yes, the devices need to have Digital Audio Input and Outputs for this to be possible.
You will need a digital audio switchbox or a surround sound receiver with 2 digital inputs.
Audio card is the physical hardware that you plug your speakers in to. Audio driver is software, that commands the hardware. You need both to hear sound.
Speakers are analog devices. There is no cable and connector that will connect a digital audio jack to a speaker without a digital to analog conversion and an amplifier. If the audio output is digital, you will need a compatible amplifier that has the same digital input. Then you will need to link the amplifier to the speaker with exterior grade cable.
Neither C nor C++ provide any built-in methods to reproduce audio. They are generic languages; audio is hardware-specific. To play audio, you need an audio library suitable for your hardware. OpenAL is the generic audio library equivalent of OpenGL for graphics.
Some capture cards will record voice as well as audio but some do not. It will depends on the settings. Also, some people say you will need to create 2 xbox live accounts to do this.
If your television has an "audio out" or "monitor out" with an audio connection you will be able to connect the television to the desired input on the av receiver. Use standard composite audio (Red and White/Black RCA) OR if the audio output on the television is digital you will need a digital coax or optical cable.
You would need Four DC Audio 7.5k for 15 Digital Designs 9918Z 18 subwoofers.
Information on audio connectors can be found at the Media College website, Best Buy, Radio Shack and Tom's Hardware. They can help you find what you need or order it for you.
Digital optical audio cable can carry data to decoder-enabled devices in a few formats; Dolby DTS is one of many such formats. Some of these can carry surround sound. Besides, optical is digital, and standard sound card output is analog.
Depends on the receiver. Some models have just a pass thru feature and connot decode the audio portion of the HDMI signal, and therefore will need a digital audio cable to get sound. Some receivers can decode the audio, so you will need to consult your manual to see what they say. If you need a audio cable it will tell you.