Some compact home theater receivers have an integrated amplifier and also decode surround sound formats, providing outputs for multiple speakers but without RCA jack outputs. The audio connections listed here are pretty typical and always depend on the particular model. The receiver then may offer an output to be used with other devices.
RCA JACK BOX TV
HDMI connections on a home theater receiver usually require you to connect the input to a TV or cable box’s HDMI output.
HDMI output: This is a format using a multi-pin cable to carry both digitally encoded video and audio data. Note that you cannot connect it to the phono input jacks on a stereo amplifier – it will need to be converted back to an analog signal. Coaxial digital output: this uses one RCA-style jack that connects with an RCA cable to carry the digital audio using electrical bits. Signals are carried using pulses of light instead of electrical bits. You can plug in an optical cable to connect to receivers with this type of input. Optical digital output: Also called a TOSLINK jack, this is a digital audio output that must be converted back to an analog signal at some point to use with a power amp. RCA jacks: These are also called pre amp output jacks or line level jacks. They’re analog signal outputs because the audio is non-digital and can be amplified directly by an external amplifier. Here’s a description of the types of connections we may be dealing with: There’s no standard set of audio output jacks for receivers so it could be none or several of the ones I mentioned above. The cables you need will depend on your receiver’s available outputs. I’d like to make sure you’re getting the best information. Here we’ll cover a few things first as I’ve noticed some information out there is not quite correct. Receivers with only digital audio or HDMI output jacks available. In this article, I’ll cover the following home stereo receiver challenges: Some receiver, cable, and audio signal basics first Can I get surround sound from a receiver with no pre-outs?. 
Will a line level adapter hurt my receiver? Will the total Ohms be ok?.
How does a speaker level converter work? Are they ok to use?. Using an amp with a receiver with an HDMI output Connecting an amp to a receiver with digital outputs Connecting an amp to a receiver with only speaker outputs DIAGRAM & EXAMPLES – Connecting an amplifier to a receiver with no pre-outs. I don’t cover preamp output or aux output use (here’s why). Some receiver, cable, and audio signal basics first.
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