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SC-651
Paging Horn Speaker

DESCRIPTION

FEATURES

APPEARANCE AND 
DIMENSIONAL DIAGRAM

TOA Corporation SC-651  1/2

• Newly developed polyimide diaphragm ensures durability during 

50W output.

• Paging horn speaker for voice paging and tone signaling distribution
• Weather-Resistant to withstand demanding environmental conditions
• Shock-resistant aluminum oval horn
• IP65 standards compliant for dust and water-resistance
• Wide temperature range: -20

°

C to 55

°

C (-4

°

F to 131

°

F)

• Steel mounting brackets for easy installation and aiming in wall, pole 

or ceiling-mount applications

TOA's SC-651 Paging Horn Speaker, rated at 50W, is designed 
especially for outdoor applications. The SC-651 speaker features 
newly developed diaphragms employing special heat-resistant 
polyimide film to prevent the diaphragm from absorbing moisture and 
changing shape, as well as to improve the low frequency 
characteristics. High speaker efficiency has also been realized by 
minimizing the gap produced when the diaphragm bobbin is installed 
in the magnetic circuitry slit. 
The SC-651 features TOA's unique oval shape, which enhances 
excellent speech clarity.
The mounting bracket, bracket holder and the horn flare are treated 
with 50-micron thick powder paint coating, which is about three times 
thicker than that of the conventional horns and external hardware 
(screws, bolts, nuts) are made of stainless steel. All of these factors 
combine to ensure the speaker's excellent weatherproofing and 
corrosion resistance. In addition, the external horn flare is made of 
aluminum which is more shock-resistant than resin. 

430 (16.93")

327 (12.87")

3 (0.12")

16

BLK

WHT

BLK WHT

600 (23.62")

100

(3.94")

51 (2.01")

51 (2.01")

37

 (1.46")

3–ø11 (0.43")

206 (8.11")

159 (6.26")

297.5 (11.71")

277 (10.91")

Wiring diagram

Rear View

Front View

Bracket dimensional diagram

Side View

Unit: mm

SPECIFICATIONS

Rated Input:

 

50W (Mobil Mount use: 30W) 

Rated Impedance:

16

Sensitivity:

 

109dB (1W, 1m)

Frequency Response:

250 – 6,000Hz

IP Code:

IP65

Polarity:

 

Hot: Black, Com: White

Operating Temperature:

  -20

°

C to +55

°

C (-4

°

F to 131

°

F) 

(must be free from dew condesation)

Finish:

 

Horn flare: Aluminum, off-white, powder coating
Reflector horn: ABS resin, off-white
Bracket holder: Aluminum, gray, powder coating
Bracket: Steel, gray, powder coating
Rear cover: ABS resin, gray
Screws and bolts: Stainless steel
Speaker cable: Polyvinyl chloride insulated 
cabtyre cable (6 mm (0.24") in diameter, 
600 mm (23.62") in length)

Dimensions:

 

430 (W) 

×

 297.5 (H) 

×

 327 (D) mm

(16.93" 

×

 11.71" 

×

 12.87") 

Weight:

 

3.4kg (7.50 lb)

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