LS-166

The LS-166/U is used with the older style military radio sets which have a U-79/U audio connector. This is a standard magnetic speaker at 8 ohms at 3 watts. The speaker inclosure includes a 8:600 Ohm transformer to match the radio to the speaker. It has a switch located on the side to switch it between vehicle use and manpack. The connecting cord is terminated with the older style U-77/U connector.

You often find these speakers with the newer U-229 connector. It was quite common to cut off the old connector and replace it with a new one. Fundamentally though this speaker was not used with the new gear using the U-229 from the factory.

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Specifications

PHYSICAL DESCRIPTION

Cone Diameter - 4 inches (101.60 mm)

Mounting Dimensions - Adjustable mounting bracket with two 9/32 inch diameter holes spaced 1-1/2 inch C to C

Plug - U-77/U

Over-all Dimensions

Length - 7-1/32 inches (178. 59 mm)

Width - 5-21/32 inches (143.67 mm)

Depth - 3-5/16 inches (84. 14 mm)

ADDITIONAL PHYSICAL DATA

Case Material - Metal

TECHNICAL DESCRIPTION

INPUT

Voice coil impedance - 8 ohms

Power handling rating - 2 watts (warble tones)

Frequency range - 300 to 7,000 cps

Transformer Data - 600 ohms primary impedance

Environmental Data

Operating Conditions:

Temperature - From -65 deg F to + 160 deg F

Elevation - 5,000 feet above sea level

Relative Humidity - 95 percent

Non-operating Conditions:

Temperature - From -80 deg F to + 160 deg F for 72 hours

Elevation - 50, 000 feet above sea level

Relative Humidity - 100 percent

Schematic

Related Files

TM 11-5965-222-14P

OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE REPAIR PARTS

SPECIAL TOOLS LISTS (INCLUDING DEPOT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS)

DYNAMIC LOUDSPEAKER

LS-166/U

31 July 1973

MIL-L-12632

MSS 5965-6