Crown International, Inc.
@crown
®
©
1996 Crown International, Inc.
Specifications subject to change without prior notice.
Crown
®
, PZM
®
and Pressure Zone Microphone
®
are
registered trademarks of Crown International, Inc.
Pressure Recording Process
™
is a trademark of E. M.
Long Associates.
8/96 K80527C7
power supply. Crown makes two phantom power
supplies: PH-4B (4 channels, AC powered) or
PH-1A (1 channel, battery or AC adapter pow-
ered).
If you want to use phantom power: Reposition
two 0-ohm resistors (R14 and R15) on the
circuit board (see text under schematic). Then
proceed to step 4.
To use 24V AC or 12-24V DC: From your power
source, run a twisted pair of power cable to the
ceiling or wall hole. Run the power cable through
the hole in the electrical box (if any) and through
either hole in the chassis. Service the end of the
power cable.
4. Run the mic cable through the hole in the
electrical box (if any) and through either hole in
the chassis. Service the end of the mic cable.
5. Attach your mic-cable leads to the screw
terminals labeled OUTPUT. Connect the mic-
cable shield to 1, audio hot lead to 2, and audio
return lead to 3.
6. If you’re using 24V AC: Attach the power
leads to the screw terminals labeled 24V AC
INPUT.
If you’re using a 12-24V DC: See Fig. 4. Connect
the positive lead from the DC source to either
screw terminal of the INPUT terminal block.
Connect the negative lead to the ground terminal
of the OUTPUT terminal block.
If you’re using phantom power: No separate
power connections are needed, since phantom
power is supplied through the mic cable.
7. Place the chassis over the two long screws.
Using the nuts provided, secure the chassis to
the faceplate.
8. Using the two screws provided, secure the
faceplate to the electrical box or wall board.
9. If you plan to use an XLR-type cable connec-
tor: Solder the cable shield to pin 1, audio hot
lead to pin 2 and audio return lead to pin 3.
If you plan to use an RCA or phone connector:
Solder the cable shield to the long lug, and
solder the audio hot lead to the tip or pin. Do not
connect the audio return lead because this may
reduce the output level in an unbalanced configu-
ration.
10. If the mic cable is run in metal conduit,
ground loops can occur that can cause hum. If
hum is present after installation, unsolder the
chip resistor labeled 000 on the printed-circuit
board (R21 GND LIFT in Fig. 4).
Architects’ and Engineers’ Specifications
The microphone shall be the Crown model
PZM-11LL or equivalent. It shall be a Pressure
Zone Microphone, mountable in a wall or ceiling,
and designed not to look like a microphone. It
shall have a line-level output (1.4 V/Pa unloaded)
and be powered by 24V AC, 12-24V DC, or
phantom power. The frequency response shall
be from 80 Hz to 20,000 Hz with a low-fre-
quency rolloff to reduce rumble and high-
frequency boost for articulation. The audio
connector and power connector shall be screw
terminals. Output shall be balanced, low imped-
ance. The electret condenser transducer shall
have a hemispherical polar pattern when the
microphone is mounted in a wall or ceiling. The
Crown PZM-11LL microphone is specified.
Warranty
Crown professional microphones are guaran-
teed unconditionally against malfunction from
any cause for a period of three years from date
of original purchase. Please refer to the enclosed
full warranty statement for more detail.
Service
If the unit fails to work, recheck all your connec-
tions as described in the Installation Section.
Check the cables and gain resistor. Also check
the power supply to verify that it is supplying
correct voltage. If service is required, return the
microphone in its original packaging to Crown’s
Service Department at Plant 2 SW, 1718 W.
Mishawaka Road, Elkhart, IN 46517. For
further assistance or technical support call 800-
342-6939.
PZM-11LL
®
D2
D4
D3
D1
C1
C5
C6 C7 C9
C4
Q1
C2
C8
+
+
+ +
+
GND
R5
GAIN
U2
OUTPUT
R21
GND LIFT
INPUT
– AUDIO
+ AUDIO
12 TO 24V DC
1
2
3
+
+
Fig. 4
MICROPHONE
CAPSULE
+
+
+
+
+
+
+
3
1
2
OUTPUT
1
2
D3
D4
D1
D2
24V AC
100
100
100
35V
STD
100
35V
STD
R13
0
R14
0
R15
0
100K
100K
R16
0
1
2
3
4
5 6
7
82K
2.2
50V
STD
100
35V
STD
6.8K
Q1
75
2.2
NP
50V
20K
U1B
6
5
7
20K
CHASSIS
GND
R21
0
(GND LIFT)
100K
100K
0.47
50V
STD
150K GAIN
3.3pF
100K
U1A
1
2
3
4
8
+VCC
+VCC
+VCC +VCC
2.2
NP
50V
75
0.01
2.2K
ELECTRONICS
+
2.2
50V
R14, R15 used only for 24V AC.
R13, R16 used only for phantom.
W1
W2
24V AC
INPUT
PZM-11LL Schematic
NOTE: Unit is factory-wired for 24V AC
operation. For phantom operation, put R14
in R13’s space; put R15 in R16’s space.
If the mic distorts, change resistor labeled GAIN to
increase headroom.
1K (supplied) minimum headroom
2K 6 dB more headroom
3.9K 12 dB more headroom
8.2K 18 dB more headroom
100K maximum headroom (mic level)
