Teac A 7300 RX Brochure

Page 2

A-73OORX Z-Tmc

The TEAC A-"ROURX is u self-contained recording
studio Housed in separate, hear) dut) protective
cuscs .ire :1 superb IAtchk Lire transport system and
the most adunccd clettronics' package ever created
for .1 mastering deck.

Ii the A-UiiURX us just another I-irack machine.
you \(Uid spend .1 lot ot Ilmc wiiipiiring it with
others. But the .v\-.\U()R\ is the tirst deck to
inCorpomte the he din decrluieqr iioisc reduction
s) stein. And \kllit tl1.it. .ill \Ulllpdrhtllh end
:Sjgljtil'lk.*llk)l\\' ratio is \sell mgr 100 dB.

ofover 100 dB can hel'nitht'ully recorded;
Meduuion is cite»: 'i:
The tape saturation point is raisedeOVdB.

We will tr:v to describe the dbx system in some detail.
as well as highlight some of the A-7300RX'5 other
distinctise tciitures. But the dbx dit'l'erencc must he
heard. The total tihsence of noise . the dCdd silence
between inusicul selections is uncanny. UlllLdi.

The d) nuiiiie rzingc ot. the music recordable is tuntastic
Almost mutt-.11, And can bc duplicated by no other
recording process Litililing inzignetic tape We urge you

.Mlhlcflrwilliig D) ii.1iiiit Rungg

In simple terms

lhe dlix ~}\h'lll intorpoiuted
into the _, ~30llRX's prctiiiiplitier
does not mere!) reduce iioisc

It tlc'llldii} iiitrmses lilL' dynamic
range 11! the sourte iii.iterui| th.il
in lie retorded on [.4ch

In .4 sense, it could lie billed

till ciili.iiiteiiiciit s} stem.

hut \\e livsitdte to use the orti
Because eiihuiitciiieiit iiiiplies
Llihrdlltill or \ildluk'. and the this
system does not alter the source
llldltrtdi in 1111) .13

I! rein/1 Ange» it 1/11 Irmmulli III
her/er 11/ 1111' inn] pummelen

a] 1111' ream/me {Al/)0

The dhx §}\1\llllll\itltik\
pre-emplmsis xllkllll\. :1 Voltmge
(oiitrollcd Ainiilitier «\tteiithor
(VIA). an RMS le\clStiis1ir,.iiitl
specul compensating \seiglitiiig
circuits. Thesc elements work
togetlier..1ri1l.1re.ill necessary to
achieve the spectacular results
ohtaiiiuhlc Wllil the AATROURX

The problem

Lne music has d tremendous
dynamic range. otten 10(JdB or
more. L'ritrirtuntitel}. even the
finest at modern tapes haw .1
tituution point ot approximately

10 experience ll \Uult,

The TEAC fix system

* l (MB on the high end, and noise.
or ttipc hiss, clearly audible .it
about ~5()dB on the low end So
the Lipe limits us to a difference
«it diUUI (iOdB between the
strongest and the most dCilktIKC
siltlnds we can record.

In other words. like "MILE to put
.1 gallon of water in a one-quart
\Ullldlntf. all the music \llllpi)
\titttlnt m on the tape.

The solution

\\ hen something doesn't fit. there
are only two possible answers
make the container larger or nitike
FIG. 1

db: , an:
" 04ch DE con:

3)
1 ii
13

AZ.

.4
fi
5
..
5
u
3
3
5
5

the substance you are try my to
contain \llluiitf

Given the limits ot modern Lipe
technology, the latter solution
was pursued.

During the recording protess.
With the dhx s) steni switched to
lNCODi. the dB Hillies ot

the iiteoining \lylltuis are
Iogziritliniiegill) condensed or
compressed in .i pcrl'uct 2 1
ratio. The) Life electronically
\ilVldLti h) two. so that -X()dB
hct'oiiies -4()dB. 11nd +ZUdB
hemmcs +l0dB. This iiieains that
men lite music WIN] a dynamic
range ot IUOdB can lit' onto
recording tupe that ordinarily .
would allow only SOdB.

tSee fig l-A)

During playback. Wllil the dbx

sy stem smtehed to DUODI'. tlii
signals from the tape including
the tape nmse inust puss
through the dhx s) stem.

And. just as u signal ot' ~30dB is
reduced to its original level ot
-oOdB. tape HON' at about
-00dB is reduced to an

inaudible AllodB.

(Sec fig. l-B) Therefore. the result
of using the dbx system is a great
improvement in the dynamic
rang»: or our recordings. Indeed,
the entire dynamic range of a live
performance can he captured.

In addition. during the decoding
process notsc is so greatly reduced
that it is virtually inaudible.