Ashly SC33 User Manual

The Ashly SC-33 Stef^ Noise Got© Is o versotlie
two channel noise reduction system, requlflng
only IV of rack space, designed to control
leokoge ond bocfcgroond rxjise in recording
and sound feintorcement appliedfioris. Acting
much like a level-sensitive "switch", it auto­maticallv attenuates audio signals which fall
below a user selected threshold, while passing
OudiO that reaches or exceeds the threshold.

FEATURES:

• Fast attack time (10jiS)

• AO dB threshold range

• TwD-stoge release dneuit

• Stereo tie patch point for occurote
tracking of two or rr>ore gates

• lr>puts and outputs mov be used
balanced or unpoiancect

• Extrerrely low noise and distor+ion

• In/out bypass switching

• Rugged 16 gauge steel chossis

The SC-33's opeiation can be bfokon down into Vo
ftjnctioncii building biociii o voltage conttolJed
omphrief [VCA) which performs the actual task of
muting <3i fjdssing the audio sigr«l.
Cffcuit which is resporTsitile for pfowdrng thg control

voltage that determlr^s the goln of the vCA

Use at a VCA os a gain control elament pnovidsi
severol advantages in a noise gdte. Including supe­rlof audio fidelliv. dccurote trockinc of two cx morTe

units tJetJ for si'&'eo operatiori. arvd crtfock/releaiB
speeds much faster' them those possible with optic
ally coupled devices The Ash ly VCA used intheSC­3i3 is □ Cfass-A device sMhibiting aKtremely low
eijstcvfioh. low hrsise. low conitiof voifoge feedthrough
(turh-or^ ctick). ond excellent thermol stability

q detsttof

The defector dreuM ericompassas all oT the frortt­panel controls anrd generates a oartrol voltoge

which gives the SC-33 its fum-an and fum-taff char

acteristics Through the use of unusually wide-rdryge
time constant options and □ unique dual rereoss­Hme circuit, o
achieved- A very fast (10 microBecond)attack time
insures that the leading edge of fdst transient
material such as snofe drums will rvever be lost, idhd

the fcxle control offeví smoofh, lineor fade timas of

up to 30 seconds. The hold coritrol oNers a ''wait
before fading" option to preverst premature inifiotion
of the tods cycle, usaful when processing moterlüt
that contains notufai peruses, such os srpeeoh ond
Insidj menial solos. The threshold range is greater
I

han úD d0, making the SC-33 useful for both
professional and semi-pro signal levefs. Other
thoughtful features include detector symmshy to

within ti dB. a hysteresis circuit lo absolutely prevent

chattering near thneshirfd high sfew-rote dfcultry
ihnoughout. ocTive bolonced irpsufs. and a li

gnaof

variety of gotirvg effects con be

gauge ^teal chaeals

Ka

Cl?™«

WraUiUCy RESPONSE

THO. 20-20 MHI, 410 diV

IIVI DlsIOrliCin. 2T>2[KHt.

Croiftalk from Key input

Inputs

-40 dBV input

@ lkH3

hblj№. TOH^SOkMl

dAlH

ciefEaofi svMMETihf

MAX iNPUT/OtJTnJT LEVEL

Colikol Voltoge

feefunrougri

Slew Ftate

ThresTicld №nge

♦ «

SPECiFfCAllONS

S№ to lOOkHi. -a,

02X

.02%

3 effl Aitock Time <p«f 40 dB

d&

-áa dhV

Unity

' C.25 da

úa dBiV lyplcoi

+20t«V

> tOV per microssOOnd

-40 dbV 10 r20 dBfy

MIECK»

•:rrMWiKA-i

------

-----

O IhMlHÚ&Ú

gain incredte}

Fad« Time (per 40 dO gain

Nolw Altenuolldn (Floor?

AiOOiriOMAt FEATURES

HcrTd Time 4(9 mlHIsacorKli iQ 12 secQTiidi

decrease?

Input Impedcince

Ouipul Impedance

“Q'

iCt mlcrosKonds to
SO woonds

1S milliseconds to
30 seconds

0 de lo (i&
40k u Bolorkood Bridgirtg

(Activo?

400 (4 , lermlmle wHh SCO U

or greolei

Key Input, jwUcn

selectable
Nou* l^le Bypass switch
stereo intercornect via

root ponel tadu

led Threiftold Indlcofot