TOA bs-678 Guida Specifiche

BS-678
Wall Mount Speaker System

The BS-678 is a double-cone type speaker with a wooden cabinet 
that has a stylish, compact and unobtrusive design and that delivers 
highly cost-effective performance. A push-in type input connector 
allows easy cable connections and bridge wiring.  The selectable 
input impedance can be easily adjusted by changing the tap position 
of the unit’s transformer. 6" (16cm) double cone speaker unit ensures 
high-quality sound, making the BS-678 ideal for BGM and 
announcement applications.  It can be installed in either a horizontal 
or a vertical orientation.  Its structure permits direct wall installation 
with screws, making the speaker unit resistant to falling even if 
outward force is applied to it.

• Stylish, compact and unobtrusive design
• Quick and easy installation
• High cost-effectiveness
• Horizontal / vertical installation 
• Ideally suited for BGM and announcements

110 (4.33")

83.5 (3.29")

28.3 (1.11")

83.5 (3.29")

250 (9.84")

3 – ø20 (ø0.79")

3 – ø5 (ø0.2")

190 (7.48")

R6 (R0.24")

R6 (R0.24")

Rated Input: 

6W (100V line), 3W (70V line) 

100V line: 1.7k

Ω (6W), 3.3kΩ (3W), 6.7kΩ(1.5W),

13k

Ω (0.8W)

70V line: 1.7k

Ω (3W), 3.3kΩ (1.5W), 6.7kΩ(0.8W),

13k

Ω (0.4W)

Sensitivity (1W, 1m):  94dB (500 – 5,000Hz, pink noise)

Frequency Response: 150 – 20,000Hz (peak –20dB)
Speaker Component: 6" (16cm) double cone-type

Applicable Cable: 

600V vinyl-insulated cable (IV wire or HIV wire)
Solid copper wire: ø0.8 – ø1.6mm (equivalent to 
AWG 20 – 14)
7-core twisted copper wire: 0.75 – 1.25mm

2

 

(equivalent to AWG 18 – 16)

Connetion: 

Push-in connector (bridging terminal)

Finish: 

Baffle: HIPS resin, off-white (RAL 9010 or 
equivalent colour)
Cabinet: Particle board with pvc sheet, off-white
(RAL 9010 or equivalent colour)
Grille: Surface-treated steel plate net, off-white 
(RAL 9010 or equivalent colour)

Dimensions: 

250 (W) 

× 190 (H) × 110 (D) mm 

(9.84" 

× 7.48" × 4.33")

Weight: 

1.7kg (3.75 lb)

Accessory: 

Speaker mounting screw (4 

× 35 (0.16" × 1.38")) × 2

Bridging
terminal

HOT

HOT(black) 13k

Ω

8

Ω

0

6.7k

Ω

3.3k

Ω

1.7k

Ω

COM

COM(white)

COM

Input

connector

Matching

transformer

Note: When mounting the BS-678 to 
plaster board walls be sure to use 
sufficient "anchoring type" bolts from 
the local hardware store instead of the 
supplied screws.