Specifications

A E
VU METERS AND PEAK INDICATORS
Tw o large VU meters in the Model 5220 mon itor
the relative recording and playback level of each
channel.
Al l meters are
"time sens it ive" devices. In oth er
words,
it takes a short amount of time for the
meter to respond to a qu
ickly appl ied signal. Even
though the meter needle and oth er moving parts
are very lightweight ,
they still have some inertia
and are re
latively sluggish w hen co mp ared to the
instantaneous natu re
of audio peaks. The meters,
th en, indi cate an average value reading w ith whi ch
to mon itor the average level and balance of the
two channels.
T he Mod el
5220 is also equipped w ith a PEAK
indicator wh ich, when used in conjuncti on w ith
the V U meters, is a valu able aid to pro per
recording level adjustment. T he
PEAK indicator,
unlike th e meters, reacts instantaneously to audio
t ransients du ri ng reco rd ing. Th e i ndic ator illu-
mi nates
if an audio tr ansient st ro ng enough to
cause tape saturat ion (d ist orti on) occurs . If the
PEAK ind ica to r flashes repeatedl y , the recording
level should be reduced .
INPUT LEVEL CONTROLS
On the front panel are four independent slide-
type input level cont rols and a stereo MASTER
LEVEL control. The MIC controls receive their
in
puts from the le ft and r ight M IC jacks on th e
front panel. T he LINE controls receive their
signal s from the rear panel LINE INPUT jacks.
Th e four input con
tro ls, or " sliders," combine
the ir a udio signals in a stereo mi x in the propor -
ti ons chosen
by you , the re cordist . They assign
the audio
input s to th e l eft and ri ght stereo
outp uts of the mi xe r as i ndicat ed by the l ett ers L
and R beside each s
lider slot .
NOTE: When microphone are selected for re-
cording , do not monitor through
speakers, as th is w ill cause howl ing
(acoustic feedback)
which could damage
your aud io equipment. Use headphones
for mon itoring.
MASTER LEVEL CON TROL
channels w it hout ch anging th e input slid er posi-
t ions and w it hout affecti ng their
pr oport ionate
audio levels.
If , for instan ce, the four input levels
are
mi xed in the exact proportions you want , b ut
the VU meters register too high a reading, reduce
the
MASTER LEVE L accord ingly .
T he
MASTER LEVEL slider can be used to "fade
out" or "f ade in" . For example, wh en maki ng a
cassette record ing
of a phonograph record, yo u
may wish to fade
out the mu sic gradually just
before th e end
of th e tape is reached. Thi s way ,
you w ill avo id th e abrupt
cut -o ff of sound tha t
occu rs
dur ing playback wh en the cassette runs
out of t ape. Likew ise, the mus ic cou ld be " faded
in" at the beginn ing of the c asse tte .
PEAK LIMITER
The peak LIMITER , whe n in use, automati cally
reduces the record level dur ing sudden volume
surges. By
pr eventing th e peak rec ord ing level
f rom exceeding 0
VU, the peak LI MI TER mi ni-
mizes di
stortion .
T he
LIMITER is not the same as an A.L. C.
(A u
to mat ic Level Con trol ) circ uit ; it is designed
rather as a safeguard against high
input signals
that you had not antic ipat ed when you adjusted
the record levels in
iti ally. Th e LIMITER is also
advantageous when record ing sources such as
radio pr ograms or live music whose peak vol ume
levels are some t imes unpredictable.
If the recording levels were set much too high and
the
LIM ITER were activated, it would tend to
" compress" th e dyn amic range of th e music. In
othe r words, not only the peaks, but all loud
pass
ages w ould be reduced in vo lume. Th erefore,
th e recordi ng levels should be set before the
LIM ITER is t urned on.
P
HONES JACK
Th is jack accepts headphones ut ili zing a standard
thre e condu ctor phon e plug. It is intern ally
con nected to the o ut put circ uit ry to prov ide
adequate sound level
with popu lar low impedance
stereo headphones.
Two or mor e sets of head-
phon es may be used wi th the aid of
"Y "
conn ec
tors (available at yo ur dealer). However,
ou
tput level will drop as addi ti onal headphones
are added.
MEMORY COUN TER
Th e MASTER LEVEL slid er adjusts th e t ot al
stereo
output level. Its purp ose is to contr ol the
audio level of the entire mi xture of th e f our in pu t
The
MEMORY COUNTER is used for pr ecise
progr am reloc ation, wh ether at th e beginning of
t he side or far int o th e recorded tape.
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