Dbx 941 prospekt

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941/942

The dbx Models 941 and 942 torovtde hroedcesters wtth dhtt Type ll Norse heductton tn the
cunvetttettt goo sertes modular lormst. The Model 9n ts a twoechennel encoderonly Tvoe ll notse
xeducllon module The Model 942 IS a two-channel dacode-anly Type I] nolse rsduchm'l module whlch
leelures en eddtttonel swltchable provtston lot decodmg dhx encoded dress The two modules cen he
used tndependentlv or tn conyuncuon to provtde up to la chennels ot dbx Type ll notse reducttott m e
stncle dbx 900 Sertes lrante uccnpwno onlysvt verttcal tnches ol reclr space.

The Type [I Home Reduchon format pmvldes a n-ul-nmum cf 30 dB DI broadband nalse reduchun
wtth s 10 dB tncreese tn system headroom tot sudto storage and lransnttsston medta In the encode
process the system compresses epphed audto stgnal leye 2-l ratto, ltneat to deethels over a 100 dB
range ln the decode process the ctrcuttry pmduces an exact mtrror trneoe l 2 expanslon ot the
encoded slgna] There are no ptlct tones er touttne caltlttattons ol the Type II system neoessarylot
accurate deccdlng ol encoded metertel

True ms level senstno tnsutes oerleot encaderdecode trachtnq tor accurate transtettt response
and tmntuntty trons nttsttaclnnc lound ttt eonventtonal notse reduotton systems due to phase shtll tn
the transmtsstou or storage medium

The dbx system ellecttvely eltmtnates tape htss tn recotdtno and prevents the notse hutldun
normelly encountered tn the trenslerttng ot tntortnatton ltont one recorded msdtutn |o enotlter lt
does not remove notse present tn the ortqtnal stonal The 9A1 and 942 notse reductton modules are
him to nrolesstnnal standards ustttq the latest advances tn ctrcutt deston and technology and are
covered by e (weeyaar ltnttted warranty on parts and labor.

Features

30 dB broadband audto notse reduotton
10 dB edded system heedroutn

True EMS level delectton lor proper
encode/decode lraokmq

Ltnear decibel compresston/exnanston
over 100 cm range does not quuue ptlol
tones or level matchmg

Electrontcelly helenced mpu|

+24 darn output drtye capobtltly

- Two notse reductton chsnnels per module
tetledusl encode, 94Zrdnal decade)

Can he used tn dbx aua Senes lreme to
pxovlde up to 16 channels ol notse
raducllon m 5% " vemcrll rack Space

trtrtecs lEtEAkDJ

ECNANNEL ZEHANNEL
LED lunctton utdtoalurs ENEODE as n:

Decades dbx encnded dtsos (942 only)

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Application
dbx Type 11 enoodmg oi proorsn. malenal, announce copy, drop-ins, etcv elieotiyely elnnrnatee lhe
«ape hiss which usually accompanies the recording process. This snows sound bite: or other
pxogxam oonlenl onolneled on canxidge: (hntoneslly, the newest link in lhe hroedoast ehsin) to
approach lhe sound quality ot hve bxoadcasung, when used tor lienster oi pxagxam matenal lo
cartridge lrorn olher reoorded sources, dbx Type II enoodinp preyenls any sddmonal none huild op
heyond lhal contained in the original malerisl. The Type ll system minimizes the audilole qualily
diilerenees heiween oerl playback and live announce or heiween one can and snolher. dhr Type II
None Raduchnn provides lreedorn irons "automated sound" and sllows a iully aulomaled slalion lo
demach live sound oueliiy while insunnp thai oarlridoe noise is low enough so es lo noi he a
problem when pumped up" dunnq dxivertime in The oonlrol room mnlhple 942 decoders are used
lo decode multiple earl machine sources end lesture the additional alnhly lo deoode dbx encoded
dnos

Nonecarfxidqe Tainted broadcast use oi the dbx Type ll syslem includes lmpxovinq ihe signal lo
noise ratio oi Tv eudio hacks and oleaning up noisy lull lreouenpylsnd lines or mlcmwave links lo
improve oompehtiveness or aohieve oomphsnoe wnh FCC guidelines. A modest inveslment in dbx
Type ll Noise liednetinn modules can proleet s much lsroer inveslmenl by vmlunqinq lhe uselul lile
ol major smdlo equrpmenl and inslallsiions lhal nugh| nol olherwne meet oonlemporsry perlormanee

slendarde

Specifications

input impedance
Balanoed e 25 k ohms
Unbalanced 7 19.5 k ohms

Oulpnt impedance
22 ohms, designed in drive 500 ohms
or qrenler

Dynamic range
110 dB (weithed haolroround noise lo
pealr signal)

Maximum lnpui level
+ 24 dBm

Maximum output level
+24 dBm m|o eon ohms or oresler

Level match range
:10 dBm (saflmg does not sileol Hacking
accumcy)

Frequency response
:03 dB 40 Hz to 20 kHz, el :11? al 30 Hz
(enoode/deoode, lypioal program materiel
lreclrinq)

Elective noise xeducfiun
30 dB, plus 10 dB headroom, 40 dB lor
dbx encoded discs (A weighted),

Xa'

lvul muse. mom...

Equivalent input noise
7&5 dBm, unweighted, 20 kHz hsndWidth

Dietonion
THD @100Hr <.5%
THD @ 1 kHz < 1%

Slow Tale
>10V/Msec

Compression/nxpunsion slop.
>21 oonslsnl linear decibel

Cmflialk lrolauon
>60 dB at 1 kHz

Conn-o]:
Level match

Switehee
Noise reduction in/oul
disc/tape (942 only)

Power supply Tequixemenls
1 15 v regulated al so ma
:24 v unrepulaied at w ina

Dimensions
Fronl penel PM ~ H x 1% " w, oard deplh
hehmd panel 9% "

mummies

ll