Crown CM-310ASW Quick Start Manual

CM-310ASW

FRONT

REAR

60˚

90˚

120˚

150˚180˚

210˚

240˚

270˚

300˚

0˚

30˚

330˚

500-3500 Hz
250 Hz
10 kHz

–20

–15

–10

–5

–0

20 100

1K

10K

+15
+10

+5

dB 0

–5
–10
–15
–20
–25
–30
–35

0˚ 2 feet

20K

0˚ ¼ inch

he Crown CM-310ASW Differoid® is a

hand-held noise-canceling microphone

T

for sporting events or other applica­tions with high ambient sound level. It
features a magnetic reed switch that turns
the mic on and off. The smooth-operating
switch operates silently.

The CM-310ASW uses Crown’s patented
Differoid technology. It is differential or
noise cancelling, so it rejects sounds that
are not close to the microphone. It has a
cardioid polar pattern, so it rejects sounds
from the rear.

These features give the CM-310ASW excep­tional gain before feedback. It permits ex­tremely loud P.A. levels before feedback
occurs. The mic also rejects unwanted
background noise. The announcer can sit in
the stands with the audience, with the P.A.
loudspeakers playing loudly, and not experi­ence feedback.

Inside the mic handle, on the PC board is a
DIP switch that sets the frequency response.
It has two settings: music and announcing.
The music setting sounds warm and
smooth, while the announcing setting has
less bass and more highs for extra intelligi­bility.

The frequency response is tailored for clear,
natural reproduction of the voice. A built-in
pop filter suppresses explosive breath
sounds. Handling noise is very low. The unit
can withstand repeated drops and abuse, as
well as extremely loud sounds without
distortion.

The output of the CM-310ASW is balanced,
low impedance, which allows long cable
runs without hum pickup or high-frequency
loss. The unit can be phantom powered from
a mixer or other remote power supply.
Included with the CM-310ASW is a conve­nient carrying pouch, the ASA-2 mic stand
adapter, and a foam windscreen for outdoor
use.

Operating Instructions

Using a 2-conductor shielded microphone
cable, plug the microphone into a mixer mic
input with 12 to 48 volts phantom powering

or use a remote phantom power supply.
Crown makes an AC-powered model PH-4B
supply for powering up to four micro­phones. Also available is a single-channel

DIFFEROID® MICROPHONE
WITH ON/OFF SWITCH

Specifications

Transducer type: Electret condenser.
Frequency response (typical): 80 Hz to 15 kHz. See

Figs.1 and 2.

Polar pattern: Cardioid. See Fig. 3.
Impedance: 200 ohms balanced. Recommended

minimum load impedance 1000 ohms.

Open circuit sensitivity, typical, close talking:

1.7 mv/Pa* (–55.5 dBV/Pa).

Power sensitivity, typical, close talking: –54.5

re 1 mW/Pa*.

Equivalent noise level (self-noise): 21.5 dB SPL

typical (0 dB = .0002 dyne/cm2), A-weighted.

S/N ratio: 72.5 dB at 94 dB SPL.
Maximum SPL for 3% THD: 151 dB SPL with 48 V

phantom, 143 dB SPL with 12 V phantom.

Operating voltage: Phantom power, 12 to 48 volts

DC, positive voltage on pins 2 and 3 with respect to
pin 3 of output connector.

Polarity: Positive pressure on the diaphragm

produces a positive voltage on pin 2 with respect
to pin 3 of output connector.

Current drain: 1.5 milliamperes.
Cable: None supplied. Use 2-conductor shielded mic

cable.

Connector: 3-pin professional audio connector (XLR

type).

Switch: Magnetic reed on/off.
Materials: Rugged aluminum alloy housing, steel

grille.

Finish: Satin black.
Net weight: 7.1 oz. (200 g).
Dimensions: See Fig.4.
Included accessories: Carrying pouch, ASA-2 mic

stand adapter and WS-4 windscreen.

Optional accessories: Crown PH-1A phantom power

supply (1 channel, battery or AC adapter powered),
Crown PH-4B phantom power supply (4 channels,
AC powered).

Replacement parts: Field-replaceable CM-310ASW

grille screen is available from Crown’s Parts
Department.

*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB

SPL.

Fig. 1

Fig. 2

+15
+10

+5

dB 0

–5
–10
–15
–20
–25
–30
–35

20 100

Fig. 3

Frequency Response

(switch set to “announcing”)

Frequency in Hz

Frequency Response

(switch set to “music”)

0˚, 0 Inches

0˚,2 Feet

160˚,2 Feet

Frequency in Hz

1K

Polar Response

20K

10K

Fig. 4

(

)

Fig. 6

CM-310ASW

2.020"

7.335"

Fig. 5

1:1 XFMR

2

3

2

3

CT

+

18V (TWO 9-V ALKALINE)

100mF 25V

+

1K
1K

100mF 25V

+

+

18V (TWO 9-V ALKALINE)

2

3

2

3

10 OHMS

1

1

TO MIXER
MIC INPUT

TO MIXER
MIC INPUT

1

TO MIC

1

TO MIC

MATCH RESISTORS WITHIN 1%

battery supply or AC-adapter supply, Crown
model PH-1A. For special applications, you
can make your own battery supply as sug­gested in Fig. 5.

Since the microphone cancels sounds that
are not close to the mic, you must talk

close to the microphone with lips touching
the grille-screen; talk directly into the
front of the microphone (as in Fig. 6).

To reduce wind noise or breath popping,
place the included foam windscreen on the
microphone. Note: This will reduce the
mic’s noise-canceling ability.

The switch inside the mic is factory-set to
“announcing.” To change the switch to
“music,” you need to pull out the circuit
board in the mic.

.840"

Fig. 7

DIP SWITCH

ANNOUNCING

MUSIC

1. Remove the screw in the mic handle near
the connector.

2. Using needlenose pliers, pull on the
connector pins to pull out the circuit board.
Be careful not to break the wires soldered to
the board.

3. Set the DIP switch as shown in Fig. 7 and
reassemble the mic.

Architects’ and Engineers’ Specifications

The microphone shall be the Crown model
CM-310ASW Differoid or equivalent. The
microphone shall be a hand-held differen-

tial-type condenser requiring 12 to 48 volts
phantom powering. Included shall be a
magnetic reed switch to turn the micro­phone on and off. The microphone shall a
have 2-position dip switch for setting the
frequency response for announcing or
music.

A smooth frequency response from 80 Hz to
15 kHz shall be obtained, with a uniform off­axis response. The polar pattern shall be
cardioid. The microphone shall have an
open-circuit sensitivity of 1.7 mV/Pa*. The
microphone shall accept a 151 dB SPL input
while providing no greater than 3% THD
(open-circuit termination). Equivalent noise
shall be 21.5 dBA typical (0 dB = .0002
dyne/cm2). The Crown model CM-310ASW
microphone is specified.

Warranty

Crown professional microphones are guar­anteed 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, first replace or
repair the mic cables and check the power
supply. If service is required, return the
microphone in its original packaging to
Crown’s Service Department at Plant 2SW,
1718 W. Mishawaka Road, Elkhart, IN

46517. For further assistance or technical
support call 800-342-6939.

W1

TO

CAPSULE

HOT

TO

CAPSULE

GND

W1

D

G

Q1

W2

S

W3

R6

C1

CAPSULE ELECTRONICS

B+

W4

R3

AUDIO

W5

R4

C2

R1

R5

R2

GND

W6

S1A

W2

W3

C3

R1

S1B

C1

C2

CM-310ASW Schematic

+

C5

R2

R3

R4

S1C

R8

R5

Q1

+

W4

R6

C6

C4

Q2

+

R7

W6

T1

RED

GRN

BLK

BLU

W5

W7

R9

+

C8

R10

+

R11

R12

1

2

W8

C7

S2

3

P1
OUTPUT

W9

Crown International, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000

®

TEL: [phone]

ELECTRONICS IN HANDLE

©

Specifications subject to change without prior notice.
Crown
tional, Inc.

FAX: [phone]FAX
Internet: http://www.crownaudio.com

1998 Crown International, Inc.

®

is a registered trademark of Crown Interna-

9/98 100389-1