MLS-300i
Intercom Speaker
The MLS-300i is a high performance intercom speaker with Push To Alert button (PTA) designed to operate with the Standard
Horizon VLH-3000 Loud Hailer.

INSTALLATION
1) MOUNTING BRACKET INSTALLATION
1. Remove the MLS-300i from the bracket by removing thetwo Mounting Bracket Knobs.
2. Choose a place to mount the MLS-300i.
3. Use the bracket as a template to mark the locations of themounting holes.
4. Use a 5.2-mm (17/64”) bit to drill the holes, and secure
the bracket with the supplied screws, spring washers, flat
washers, and nuts (Figure 1 & 2).
5. Insert the MLS-300i into the bracket with the Mounting
Bracket Knobs which were removed in step 1.
6. Set the MLS-300i to the preferred angle, then tighten theMounting Bracket Knobs to fasten the MLS-300i to thebracket.
7. Route and secure the connection cable from the MLS-300i
to the VLH-3000 Loud Hailer. Connect the WHITE wireof the connection cable to the “positive (+) intercom
speaker output,” the shield of the connection cable to the“negative (–) intercom speaker,” and the YELLOW wireof the connection cable to the “push to alert” terminal (Figure 3).

You may reverse
the position of thebracket.

YELLOW

WHITE

BLACK

YELLOW

WHITE

BLACK

Figure 1 (Desktop Mount)or

Figure 3

Marine Division of VERTEX STANDARDUS Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.

www.standardhorizon.com
EA

E

31X

200

Figure 2 (Wall Mount)2) FLUSH MOUNT INSTALLATIONTEMPLATE for the MLS-300i
5

Use this template to mark the location
where the round hole for the flush
mount is to be cut.

Figure 4Washer

95

Nut

M4x50 Screw
Wall thickness + 1 inch

Figure 5OPERATION (PTA FEATURE)
To call the VLH-3000, press the PTA button. A calling beep
will be heard on the VLH-3000 with an indication of the intercom station (IC1 or IC2).

106 mmREPLACEMENT PARTS
PTA (Push To Alert) Button (Black):
PTA (Push To Alert) Button (White):
Mounting Bracket (Black):
Mounting Bracket (White):
Mounting Bracket Knobs (Black):
Mounting Bracket Knobs (White):
Mounting Bracket mounting hardware:

SPECIFICATIONS
Speaker Impedance:4Ω
Maximum Power Input:
10 W
Connection Cable Length: 6.5 feet (2 m)

RA0831900
RA0815300
RA0653900
RA0653800
RA045910A
RA043770A
U9900147

φφ106 mm

1. Remove the MLS-300i from the bracket by removing thetwo Mounting Bracket Knobs, then remove the rear caseof the MLS-300i from the main body by removing thefour screws (Figure 4).
2. Assemble the supplied M4x50 Screw, Nut, and Washer as
the Figure 5.
3. Use the supplied template to mark the location where theround hole is to be cut. Confirm the space behind the dashor panel is deep enough to accommodate the MLS-300i(at least 2.8 inch (70 mm) deep).
4. Cut out the round hole (one large hole and four small
mounting holes) and inset the MLS-300i from the frontside.
5. Referring to Figure 6, pass through the four M4x50 Screws(with Nut and Washer) into the mounting holes on the panel
from the back side and turn the M4x50 Screws five times.
6. Turn the four Nuts to adjust the tension so that the MLS300i is tight against the mounting surface.
7. Route and secure the connection cable from the MLS-300i
to the VLH-3000 Loud Hailer. Connect the WHITE wireof the connection cable to the “positive (+) intercom
speaker output,” the shield of the connection cable to the“negative (–) intercom speaker,” and the YELLOW wireof the connection cable to the “push to alert” terminal (Figure 3).

Figure 6