Crown PH-4B User manual

PH-4B
FOUR CHANNEL
AC POWERED 48V
PHANTOM POWER SUPPLY
The Crown PH-4B is a 48-volt phan-
tom power supply for condenser and
electret-condenser microphones. It
has four channels for powering up to four
microphones.
As shown in Fig. 1, it supplies 48V DC on
mic-connector pins 2 and 3 with respect to
pin 1 (complies with DIN standard 45 596).
The phantom supply is highly filtered to
minimize hum.
The PH-4B itself is powered by 120V AC. It
is also available powered by 220V and 240V
as the PH-4BE4.
Operation
1. Plug the AC cord into a wall outlet. The
LED pilot light will show that the line voltage
is applied.
2. Please refer to Fig. 2. You will connect the
PH-4B between your mic and your system
mic input.
3. Plug the cable from your microphoneinto
one of the mic inputs on the PH-4B.
4. Obtain another mic cable and plug it into
the adjacent output on the PH-4B.
5. Plug the other end of that cable into the
mic input on your mixer or recorder.
The total current drain of all channels of the
PH-4B should not exceed 100 mA. To deter-
mine how much current your microphones
draw, check their data sheets and look for
the current-drain specification.
CAUTION: Inside the mic-cable male XLR
connector (the one that plugs into a PH-4B
input), do NOT tie pin 1 to the shell ground
lug. If pin 1 is tied to the shell and you con-
nect an output of the PH-4B into an unbal-
anced mic input, this connection might
cause hum.
Specifications
Type: Four-channel, AC powered.
Supply voltage: +48V DC on pins 2 and 3 with
respect to pin 1 of microphone input con-
nector.
Total output current: 100 mA continuous.
Line voltage (PH-4B): 120 VAC.
Line voltage (PH-4BE4): 220 - 240 VAC.
Connectors: 3-pin pro audio (XLR-type) input
and output connectors.
Construction: Steel for strength and magnetic
shielding.
Dimensions: 7 1/16" L x 12" W x 1 3/4" H
(17.93cm x 30.48cm x 4.45cm).
Finish: Black.
Weight: 4 lb. 12 oz. (2.15 kg).
Accessory: RMPB kit.
Fig. 1
Fig. 2
+
+
6.8k
6.8k
TO OTHER
CHANNELS
MIC OUT
3-PIN
MALE
MIC IN
3-PIN
FEMALE 33µF
50V
33µF
50V
48 VDC
SUPPLY
21
3
12
3
POWER
PHANTOM
IN MIC 1 OUT IN MIC 2 OUT IN MIC 3 OUT IN MIC 4 OUT
AUDIO
OUT
MIC MICMICMIC

Crown International, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: [phone]
FAX: [phone]FAX
PH-4B
©2000 Crown International, Inc.
Specifications subject to change without prior notice.
Crown®is a registered trademark of Crown Interna-
tional, Inc.
02/00 125519-2
Hum might also occur if the PH-4B is rack-
mounted and connected to an unbalanced
mic input. If this happens, electrically isolate
the PH-4B from the rack (say, by using ny-
lon bolts and washers).
How to Prevent Switching Clicks
In rare instances, you may need to use the
PH-4B with a mic-level switcher. This may
result in switching clicks as each PH-4B out-
put connector is fed by two large coupling
capacitors. These capacitors block the DC
voltage from the phantom power.
Since these capacitors are charged by phan-
tom voltage, some DC appears at the PH-4B
outputs. This DC goes away when the PH-4B
is plugged into a mixer microphone input
because the mixer input impedance drains
off the charge.
However, if you feed the PH-4B outputs to a
mic-level switcher, you will hear clicks or
pops when the outputs are switched, due to
the capacitor charge.
To prevent these clicks: In the switcher, sol-
der a 47K, 1/8 watt resistor between input
pins 1 and 2, and another 47K resistor be-
tween input pins 1 and 3. Do this for each
PH-4B output connector. Those bleeder re-
sistors will drain off the capacitor charge.
Architects’ and Engineers’ Specifications
The unit shall be the Crown PH-4B phantom
power supply or equivalent. It shall supply
48V DC on pins 2 and 3 with respect to pin 1
of the mic input connector, according to DIN
standard 45 596. It shall provide four chan-
nels for powering up to four condenser or
electret condenser microphones. The PH-4B
shall be powered by 120V AC. The PH-4BE4
shall be powered by 220V or 240V AC. The
Crown PH-4B is specified.
Warranty
The PH-4B has a three-year warranty.
680 +
+
6.81K
1%
6.81K
1% 330
50V
+
33
50V
33
50V
12
3231
POWER
AMBER
+
+
+
6.81K
1%
6.81K
1%
330
50V
33
50V
33
50V
680
12
3231
+
6.81K
1%
6.81K
1%
330
50V
+
33
50V
33
50V
680
12
3231
+
+
+
6.81K
1%
6.81K
1%
330
50V
33
50V
33
50V
680
12
3231
4.7K
1W
ORG RED
BLK
LED1
INPUT MODULE
+
J1 J2 J3 J4 J5 J6 J7 J8
+
POWER SUPPLY MODULE
J9
+
4.7
63V
75
1%
2.87K
1% 1W
IU1 O
220
160V
D1
Q1
27 OK
.047
D3
D2
D5
D4
RED
RED/YEL
YEL
RED
YEL
RED/YEL
2.7
.5W
BLK
BRN
WHT
BLK
BRN
WHT
T1
JUMPER
120V
JUMPER
240V
JUMPER
120V
1/8 A
120VAC
+
_
10%
PH-4B Schematic
Service
If the PH-4B does not function properly,
verify that you measure approximately 48V
DC on pins 2 and 3 with respect to pin 1 in
each mic input connector (the female con-
nector in each channel). Also repair or re-
place any defective cables. If the PH-4B
requires service, return it in the original
packaging to: Crown Service Department,
Plant 2 SW, 1718 West Mishawaka Road,
Elkhart, IN 46517. For further assistance or
technical support call [phone].