21
ODEP™ (Output De
vice Em
ulator Protection)
ODEP
, Cr
own’
s sophisticated pr
otection cir
cuitr
y,
is a radical
depar
tur
e fr
om other amplifi
er pr
otection methods.
Cr
own developed ODEP to solve two long-standing pr
oblems in
amplifi
er design: to pr
event amplifi
er shutdown during demanding
operation, and to incr
ease the effi
ciency of output cir
cuitr
y.
T
o
do
this, Cr
own initiated a pr
ogram which tests ever
y output transistor
to deter
mine its SOA (safe operating ar
ea). ODEP cir
cuitr
y inside
the amplifi
er then simulates the operation of the output transistors
and compar
es it to their SOA. In the unlikely event that mor
e
power is r
equir
ed than the transistors ar
e capable of delivering
under curr
ent conditions, ODEP immediately limits their drive
level until it falls within their SOA. This limiting is pr
opor
tional and
is kept to an absolute minimum. This level of pr
otection enables
Cr
own to incr
ease output effi
ciency while at the same time gr
eatly
incr
easing amplifi
er r
eliability
. Y
ou get maximum power with
maximum pr
otection.
Unlike other amplifi
er pr
otection schemes that shut down the
amplifi
er
, Cr
own’
s ODEP makes cer
tain the show goes on.
IOC
®
(Input Output Compar
ator)
The IOC is a sophisticated built-in distor
tion meter that
compar
es the wave-for
m of the input signal to the wavefor
m of
the output signal. In the rar
e instance that it detects a variation
of 0.05 per
cent or mor
e, it fl
ashes the IOC indicator of the
of
fending channel.
The IOC indicators help you tr
oubleshoot the sour
ce of distor
tion
by showing you wher
e it’
s not — your Cr
own amplifi
er
.
P
.I.P
. Compatibility
All Macr
o-T
echs ar
e P
.I.P
®
(Pr
ogrammable Input
Pr
ocessor) compatible. These cir
cuit car
d modules
plug into a P
.I.P
. connector on the r
ear panel of the
amplifi
er
. Cr
own’
s P
.I.P
. modules enable you to tailor
each amplifi
er to specifi
c applications as well as plug
into futur
e technology as it’
s developed. Installation
of an IQ-P
.I.P
. per
mits each Macr
o-T
ech to inter
face
with our innovative IQ System™ for complete amplifi
er
monitoring and contr
ol. Some curr
ent P
.I.P
. modules
include a sophisticated pr
ogrammable cr
ossover
and equalizer
, r
emotable mic/line priority mixers and
calibrated sensing modules.
Amplifi
er Status At A Glance
The Macr
o-T
ech Series fr
ont panel gives you vital
operating infor
mation with a minimum of ef
for
t. T
wo
dual-function IOC/Signal Pr
esence indicators monitor
the transfer function of each channel. Gr
een indicator
lights illuminate to show signal pr
esence and fl
ash
brightly if distor
tion equals or exceeds 0.05 per
cent.
An amber Enable indicator
, power
ed by a small,
separate power supply
, verifi
es operation of the
amplifi
er’
s low signal cir
cuits, DC pr
otection and
onboar
d digital computer
.
A pair of amber ODEP indicators show the r
eserve
energy status and indicate when unfavorable
operating conditions ar
e sensed and limiting is
beginning to take place.
