Ed's AV Handbook.com
Home Theater & High Fidelity Stereo Audio

Chapter Five
The AV System Sequence
Page 1
Batting practice for the audio/video pro and a primer for the novice 

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Conform or perish
          AV conformity is mandatory.  Exits lead only to entrances.   Non-conformity results in silence and a blank TV screen.  If you want to be successful with the AV systems sequence, you must learn to go with the electron flow of the A/V system sequence.  

Source > Preamp Processor > Amplifier > Speaker or TV
Any system or device that reproduces sound or displays video
includes each of these system sequence steps.

1. Source
          An audio or video source is the originating component of the sequence.  Each source has output jacks that feed the input of an audio preamp, AV preamp processor, television, or projector.  
          Sources include a CD player, DVD player, Blu-ray player, television
(off-air, satellite, or cable) tuner, media server,  AM/FM tuner, VCR, turntable, cassette deck, etc.

2. Audio Preamp/AV Preamp Processor
          'It' exists in many forms: the audio preamp, the AV preamp/processor (pre/pro), the preamp stage in a stereo receiver or integrated amplifier, the pre/pro in an AV receiver, and the video switching/processing in a television, video monitor, or projector.  In each case,
'It' serves as a router and controller.
          Sources enter via its dedicated (generally rear) input jacks.  A knob or row of buttons on its front panel or remote control selects the connected source.  
          Another knob
(or knobs) and/or set of buttons selects the desired manipulation of the source.  Manipulating choices include volume, tone or equalization, digital or analog, stereo or mono, Dolby or DTS, video decoding, etc.  
          The selected source is then directed to its output in route to the input of an amplifier or video display.

Handbook Note:
Many receivers and AV pre/pros have eliminated the phono preamp stage.  If a turntable is in play, then a phono preamp must be added as a separate component at the input of the preamp.  The phono preamp amplifies the low output voltage of a phono cartridge to a level consistent with other audio sources.  In addition, the phono preamp provides mandatory LP RIAA decode equalization.


3. Amplifier
        Audio Amplifier

          The audio amplifier is the horsepower of an audio system.  It is fed at its input by the preamp.  It amplifies the audio signal in route to the amplifier’s speaker output terminals.

        Video Amplifier
           A video amplifier is integrated with the video processing of a television, video monitor, or projector.  It boosts and prepares a selected video source signal for the decoding processing sequence steps.

4. TV or Speaker / The final sequence step
     The audio voltage from the amplifier is fed to a speaker.
     The amplified video signal illuminates the TV screen.

Handbook Note:  
A stereo receiver is an AM/FM Tuner Source + AudioPreamp + Amplifier in one 'box'.
An AV receiver is an
AM/FM Tuner + AV Pre Pro + Multi-channel Amplifier in one 'box'.
An integrated amplifier is an Audio Preamp + Amplifier in one 'box'.
A portable radio is an AM/FM Tuner + Preamp + Amplifier + Speaker in one 'box'

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Ed's AV Handbook.com
Batting Practice for the AV Pro and a Primer for the Novice.
Copyright 2007 Txu1-598-288   Revised 2018