Amplifier > Speaker
and or TV / Projector
An audio or video
source is the initial component of the sequence. Audio
and video sources include compact disc players, turntables,
DVD players, BluRay players, cable boxes, satellite
receivers, Internet streaming devices, AM/FM tuners, audio
cassette decks, game consoles, off-air television tuners,
Bluetooth devices, etc.
Each source has output jacks
that feed the input jacks of the next step in the sequence
via -- HDMI, single-ended RCA, optical Toslink, or balanced
XLR -- interconnecting cable. Sources with Bluetooth
and WiFi transmitters connect to Bluetooth and WiFi
receivers of the next sequence step.
or AV Preamplifier
The next step in the
sequence path is the audio preamp or audio/video
preamp. Sources enter the preamp via dedicated labeled
input jacks or wireless Bluetooth and WiFi receivers.
The preamp switches between connected sources via a knob or
row of buttons on the preamp front panel.
Prior to the exiting the
output jacks, selected sources are manipulated and or
processed via another knob, buttons, or the setup
Manipulation includes volume, bass/treble control,
equalization. Processing includes surround formats,
digital audio formats, video scaling, video
The selected source is then routed to the next step in the
Audio or Video Amplifier
The Audio Amplifier
The audio preamp output jacks
connect to the input jacks of the amplifier.
The amplified audio then continues to the speaker connecting
The Video Amplifier
The AV preamp video output
connects to the video input of a TV or projector.
Video amplification is integrated with the TV video decoding
The Speaker ...........
The amplifier output speaker
jacks are connected to the speaker input jacks.
The modulating speaker cone reproduces the ultimate sound
........ and or TV/Projector
The AV preamp output connects
(typically via an HDMI interconnect) to the TV or projector
The combined output of the TV video decoder/amplifier
illuminates the pixel elements of the TV or projector.
Sequence confusion, audio
adjustment, and three additional notes.
1. TV Confusion
The television can add confusion. TVs include
additional input jacks plus
"The Sequence" of an off-air-TV-tuner source > switching
pre-amp > amplifier > speaker and TV screen.
This permits the TV to perform as a stand-alone low-fidelity
audio plus video system.
2. *Pre-amp Adjustment
Many audio pre-amps and receivers have eliminated the phono
preamp stage. If a turntable is in play, then a
dedicated-phono-pre-amp must be added and inserted to the
input of the pre-amp. The phono pre-amp boosts phono
cartridge voltage and provides RIAA specified playback
3. Sequence Note
A stereo or AV receiver is a source AM/FM tuner + pre-amp +
amplifier in one cabinet.
An integrated amplifier is a pre-amp + amplifier in one
A portable radio is an AM/FM tuner + pre-amp + amplifier +
speaker in one very small cabinet.
4. Video Sequence Route Note
The video source determines the interconnect path to the
TV. Contemporary product is widely limited to HDMI
cabling. However, legacy product may employ composite
video, component video, or RGB interconnects. If you
start a sequence with composite video, then composite
cabling must continue to the TV. If component cable,
then component cable must complete the sequence.
Multiple types of video cabling requires multiple hookup
paths to the TV, plus video source switching, unless the
receiver/preamp includes video transcoding.
Typical transcoding converts composite and component video
to HDMI. However, transcoding has disappeared
from many current AV receivers. Therefore, ask
customers if they plan to use legacy video sources.
Then choose the appropriate receiver/preamp.
5. Interconnect Jack Note
Each sequence step above described connection via outputs
and inputs jacks. Integrated devices (as in Note #3)
are connected on their PC boards.