~RE~V~.O~
__________________
~~~75~PO~W~ER~A~M~P~L~W~~~R
__________
~~~~~
~
7. Specifications
7.
1
Ge
neral Specifications
Hu
m and
Noise:
From
20Hz-20KHz
me
hum
and
noise
level is below 1
75
microvolts and
1000B
below
the
rated
output
Phase Response: +
10
degrees, -I 5
degrees
20Hz-20KHz
at
I walL
Input Impedance: (XLR balanced) 20,000 ohms ± 30%.
(XLR unbalanced) 10,000
oh
ms ±30%. (phone j
ac
k.
unbalanced) 25,000 ohms ±30%.
Amp
lifier
Out
put
Protec
tion: Total protection against
shoned,
mismatched
or
open
outputs.
VaIL-Ampere
limiting circuil.ry
acts
instantaneously
with
no
annoying
thumps or cutouts.
Overall
Protection:
AC line fused. The controlled
slewing rate
of
the voltage amplifiers protects
th
e overall
amplifier against
RF
burnout Input overload
proteCtion
is
furn
ish
ed
by
an
internal
resiSlanCCal
the
amplifier's
inputs.
DC
Outpu
t Offset: (shorted input)
±IO
millivolts.
Turn
On: Instantaneous,
with
minimum
bass
thumps
and
no
program
delay.
Circuit: A total
of
42 transistors, 18 signal diodes, 2
zener
diodes, 4 rectifiers and 3 linear
Ies
(dual
op
-
amp)
are
u
ti
lized
in
a wideband multiple feedback
loop
design.
Power Supply: A specially designed
low
profile
uansfonner,
two
regulated supp
li
es for complete isolation
and stability plus computer
grade filter capacitors serve
to
power lhe D-75.
Power
Requirements:
AC
VOltages
of
100,
120,200,
220, and 240
volts
±10%
ala
line-frequency between
50
and 400Hz
may
be
used.
Power Consumption:
15
watts while at idle,
120
walts
at
the
full
rated
Output.
H
ea
t Sinking: The entire amplifier
is
used
as
a
heat
sink.
Front-panel extrusion acts
as
a
hea
t sink along
with
the
chassis covers.
Chassis: Aluminum-chassis constructi
on
for
ma
ximum
heat conduction and minimum
weighL
Controls: Two inpm-level controls and a power switch
on
the from panel. A
mono-sl.Cll:O
switch, located next to
the input jacks,
on
the rear panel.
Indicators:
210C
indicators (red), 2 Signal-Presence
indicators
(green), I Power indicator (amber).
Connectors,
Input
:
XLR
3
pin
audio connector
in
which
pin
2 is positive. (
for
a positiveoulput signal),
or
1/4~
phon~jack.
Ground Link: A means
for
isolating or
unitin
g chassis-
ground
from
or
with
elec
cri
cal ground
is
provided
on
the
rear panel. The grounds are always connected
im
emally
by
2.7
ohms.
Outputs:
Col
o
r-
cod
ed
binding
POSlS
wilh
a
1/4~
stereo
earphone
jack
on
the
front
pa
nel.
Dimensions:
19"
(48.26cm) long,
9"
(22.86cm) dee
p.
and I
3/
4
~
(4.45cm) high, 8
Ill
" (2
1.
59cm) deep from
mounti
ng surfa
ce.
A 19"
West.em
Electric standard rack-
mounti
ng sys
tem
is utilized.
Weight:
10
pounds (4.54Kg) net weight.
Finish: Satinized aluminum front panel
with
grey
suede
Lcxan inscn.
7.2Monaural Specifications
Output Power (8 o
hm
s):
95
walts minimum
RMS
into
an
8
ohm
load
over a bandwidth of 20Hz-20KHz at a
rated
RMS
s
um
IOtal
harmonic distortion of 0.05% of
the
fundamental output voltage.
Output Power (
16
oh
ms
): 70
watlS
minimum
RMS
into
an
160hm
load
over a bandwidth
of
20Hz-20KHz
3t
a
rated
RMS
sum
total hanno
nic
distortion
of
0.05% of
the
fundamental output voltage.
Frequency
Response:
±O.2dB
20Hz-20KHz, I watt, 8
ohms.
1KHz Power: 80
watlS
RMS
into
16
ohms; 110
waIlS
RMS
into 8 ohms,
(0
.1 % Total Harmonic Distortion).
LM
. Distortion: Less than 0.05%
from
om
watts
100.25
walts, and less than 0.01%
from
0.25
watlS
to
70
watlS
into
16 o
hm
s.
Specifications 7
·1
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