Batting Practice for the AV Professional
and primer for the novice
5 Page 2
The AV System Sequence
The Record Loop
- Legacy receivers, some AV receivers, plus audiophile
preamps include a useful diverting exit and reentry
path. It is the record/tape output and input
Think of the input/output loop as an audio off-ramp with a
quick on-ramp. As a selected source begins its path
to the pre-amp output, prior to entering any audio
manipulation or processing, the source simultaneously
exits at the record output.
The source volume at the record output is fixed. The
fixed output can advance to the input of a recording
device. The re-entry record input is still prior to
any manipulating or processing. Engaging a front
panel tape monitor switch allows the recorded audio to
reenter and continue to the preamp output. Engaging
the tape monitor over-rides all other source selection.
But why is the tape
monitor a separate dedicated priority switch?
A point of tape loop confusion derives from the word
monitor of the Tape Monitor switch. Monitor is to
observe or listen.
Audio enthusiasts and the 3rd head
Many tape recorders provided a 3rd-head linked to
a Tape Monitor switch on the
The 3rd-head allows the listener to monitor, to listen, to
the result of their recording as it is recording.
The 3rd playback-only
head is located after the initial 1st
erase/bias head, and the 2nd recording
head. Engaging the recorder's
Tape Monitor switch allows listening to the 3rd head
playback result of the record head while recording.
The tape deck includes a headphone monitor jack for this
The 3rd head result also passes
to a connected receiver or preamp via the tape
deck output jacks to preamp tape input jacks.
Therefore, selecting the receiver
or preamp Tape
Monitor switch also allows listening to the result of the
3rd head. Disengaging the Tape Monitor switch allows
comparison to the original source.
Silent and Confused
The tape loop confuses many owners of tape loop
product. The receiver/preamp tape monitor switch
overrides all input selections. If engaged, and a
tape player is not connected and playing, listeners are
confronted with silence. Disengaging the tape
monitor allows normally selected sources to pass.
Miss-engaged tape monitor switches led to many distressed
phone calls to audio stores in the 1970s and 1980s.
Record Loop Processing Options
1. The preamp record tape loop can optionally engage an
equalizer, reverb, audio mixer, or surround sound decoder
rather than a tape recorder.
The engaged tape monitor loop passes decoded, equalized,
or reverb processed audio to the preamp output.
2. Many receivers and preamps also included a record-output
selector. This switch offers the option of
routing a source to the record output,
while allowing the main input selection switch to choose a
different source to pass to the preamp output.
3. Many audio dealers used the tape output and
record-output selector to route sources to an
preamp/amplifier in another room or zone.
Multi-room / Multi-source
Many manufacturers have re-labeled the 'record
output' as the 'multi-room
output', and the 'record
output selector' as a 'multi-source
selector'. This feature promotes the
routing of sources to an amplifier and speakers in another
room or zone. However, they have eliminated the Tape
Plus, the multi-room source may be routed to a volume
control prior to the multi-room output.
Ed's AV Handbook
Copyright 2007 Txu1-598-288 Revised 2021
Speaker Tuning System
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