Schematic For Full Range Electrostatic Speaker Connections - Crown DC-300A Instruction Manual
Dual channel laboratory amplifier
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Also See for DC-300A:
- Instruction manual (31 pages) ,
- Service manual (49 pages) ,
- Instruction manual (42 pages)
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40
R,
R,
LOAD
R,
30
RESISTANCE
DAMPING
(ohms)
FACTOR
100
20
50
cy
«
15
ry, & 20
KY
of4+
Ve
»,
ry o
10
w/t
fe
We
we
4
10
ry, '3
w/e
9
~
°
e
2
8
7
1
6
04
8000
5000
06
Ry
SOURCE
{A/1000 f+.)
ANNEALED
a
RESISTANCE
woooy
COPPER
(ohms)
2-COND.
500
WIRE
2
CABLE
(AWG)
(feet)
—~# 28
100
4
5
——# 26
10
50+— #24
6
20
——-#22
50
we
1
AOD
oD #8
200
—
#16
5+—#14
2
aoe
— #12
1000
=—
2000
vr
4
5000
—#6
5+—#4
6
—#2
—#0
ie
—#00
1—¥# 0000
.05
20
01
40
FIG. 2-4
SOURCE RESISTANCE AND DAMPING FACTOR VS. LENGTH AND SIZE OF OUTPUT LEADS
is provided for wire selection.
For dynamic
moving-coil
loudspeakers
the value of R, should
preferably be that
measured
by an ohmmeter
across the voice coil, rather
than the manufacturer's
rating. For electrostatic speak-
ers and such, the manufacturer's rated impedance should
be used for R.
If the
load (matching
transformer,
inductance,
or full-
range electrostatic speaker system) appears
as a short-
circuit
at
low
frequencies,
a
large
non-polarized
capacitor (paralleled
with
a resistor)
should
be placed
in series with the load.
For electrostatic
speakers
(if the
manufacturer
has
not
provided a capacitor) an external
non-polar
capacitor
of
590-708 mfd and 4 ohm power resistor should be placed
in series with the plus (+) speaker
lead. This will pre-
vent
large
low-frequency
currents
from
damaging
the
electrostatic
transformer
or
from
unnecessarily
activating
the
DC-300A's
protective
systems.
An
ef-
fective test to determine
if such
parts are
needed
is to
4,20W
From
Amp
|
(7—
"Full,
Range
Output
a>
P
590-708 yt
l
nH
pas
110 VAC, NLP.
=>
Suing ne.
|
yo
blocking
x?
capacitor)
GND
FIG. 2-5
SCHEMATIC FOR FULL RANGE
ELECTROSTATIC SPEAKER CONNECTIONS
measure the DC resistance between the output terminals
with an ohmmeter. If the resistance is less than 3 ohms,
the parts
should
be added
as shown
schematically
in Fig. 2-5.
When selecting connectors for the output lines, the follow-
ing general precautions apply (with all power connectors):
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