MICROPHONE PLACEMENTMOUNTING
Use one AMS microphone to cover one or two talkers. To acti-AMS22
vate the microphone, a talker must be within the 120 acceptance
To permanently mount the AMS22 to a table, desk or lectern,
angle (See Figure 2). The talker must also be at least 9 dB louder
drill a hole through the surface, then insert a 4-40 screw through
than any other sound source outside of the 120 acceptance
it and into the threaded nut in the microphone base.
angle.
Note: Use the largest flat surface possible. If the mounting sur-
w The closer the microphones are to the talkers, the louder the
face is too small, low-frequency rolloff may occur and the micro-
sound system can be before feedback occurs.
phone may pick up more background noise.
w Always use the fewest number of microphones necessary.
AMS24
1. After optimum locations are determined, drill the surface for the
cable. The cable diameter is approximately 2.5 mm (0.1 in.).
2. Mount the flange, drilling pilot holes for the mounting screws,
120 ousing the flange as a template.
3. With the flange mounted, thread the cable through the hole.
4. Screw the microphone gooseneck to the flange.
Note:
w If more cable length is needed, use high-quality, shielded
ACCEPTANCE ANGLEtwo-conductor microphone cable similar to that supplied with
the AMS24. Make sure proper polarity is maintained.
Figure 2
w An optional accessory (A24QG) is available to convert the
AMS24 gooseneck microphone to a direct plug-in microphone
IMPORTANT
with a three-pin male XLR connector.
Place the microphone at least 1 meter (3 ft) from the wall be-
hindit, and at least 0.3 meters (1 ft) in front of any bulky objects. AMS26
AMS24 and AMS26: The grille must be at least 203 mm (8 in.)Use the supplied A57F swivel adapter to install the AMS26 onto
above any horizontal surface. If necessary, you can raise thea microphone stand or gooseneck.
AMS26 an additional 76mm (3 in.) using the optional Model
AMS28
A26X Desk Stand Extension.
1. While holding the AMS28 by the rubber ring of the lavalier as-
AMS28: The microphone must be kept at least 76 mm (3 in.)
sembly, place the lavalier cord around the user's neck and se-
away from any solid surface. This includes table tops, lecterns,
cure the free end of the cord in the slot at the side of the assem-
and other hard edges that the user may lean into and note-
bly.
books they may be holding while talking.
2. Adjust the cord length so that the AMS28 is 200 to 250 mm
(8 to 10 in.) below the user's mouth.
CONNECTIONS3. Fasten the clip to the user's clothing and pull the cord through
the slot to take up slack. If desired, the clip can be rotated for
AMS microphones use standard two conductor shielded micro-
phone cable. For most applications, cable lengths of 150 metersleft or right fastening, or it can be removed by turning it to the
(500 ft) or more are acceptable.vertical position and pulling straight out.
Alternate method:
NOTE: The shield must be connected to pin 1 at both ends
of the cable. Ground all cables to the AMS mixer chassis.In certain situations, the cord may slip through the open slot at
the side of the lavalier. If necessary, use the following method:
1. Tie a knot in the cord about 25 mm (1 in.) from the free end.
SHIELD
Red = pin 2G2. Place the rubber ring over the microphone, taking care not to
1
2Black = pin 3cover the grille or any side slot.
Shield = pin 1 RED3
3. Place the microphone?lavalier assembly around the talker's
(and ground lug)
neck.
BLACK4. Open the spring?loaded alligator cip at the back othe lavalier f
and slip the cord through the open clip.
CABLE WIRING DIAGRAM
5. Adjust for proper length and release the clip. The knot will stop
Figure 3
the cord from pulling through the closed clip.
POWER
AMS microphones do not use standard phantom power. Only
use the 7 Vdc bias power provided by and AMS mixerConnect- .
ing the microphone to any other mixer or power source may
damage the microphone.
2 |
ACEC
