TOA bs-678 Installation Instruction

Indicates a potentially hazardous situation which, if
mishandled, could result in moderate or minor personal
injury, and/or property damage.

Indicates a potentially hazardous situation which, if
mishandled, could result in death or serious personal
injury.

Thank you for purchasing TOA's Wall Mount Speaker. 
Please carefully follow the instructions in this manual to
ensure long, trouble-free use of your equipment.

• Before installation or use, be sure to carefully read all the

instructions in this section for correct and safe operation.

• Be sure to follow all the precautionary instructions in this

section, which contain important warnings and/or cautions
regarding safety.

• After reading, keep this manual handy for future reference.

• The BS-678, of which cabinet is made of wood, can be

installed in a vertical or horizontal orientation.

• Either concealed in-wall wiring or exposed wiring can be used

for speaker cable connection.

• The speaker structure that permits direct wall-mounting with

screws prevents the speaker from falling easily even if an
outward force is applied to. 

• The input impedance can be easily changed by changing the

tap position of the transformer.

• Two built-in 6-inch double cone speaker units deliver high

quality sound.

• The push-in type input connector makes cable connections

easy and allows bridge wiring. 

Note: The design and specifications are subject to change without notice for improvement. 

6 W (100 V LINE), 3 W (70 V LINE)

100 V line: 1.7 kΩ (6 W), 3.3 kΩ (3 W), 6.7 kΩ (1.5 W), 13 kΩ (0.8 W)
70 V line:   1.7 kΩ (3 W), 3.3 kΩ (1.5 W), 6.7 kΩ (0.8 W), 13 kΩ (0.4 W) 

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

150 – 20,000 Hz (at 20 dB below peak)

16 cm (6") double cone type

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

2

(equivalent to AWG 18 – 16)

Push-in connector (bridging terminal)

Baffle:

HIPS, off white (RAL 9010 or equivalent color)

Cabinet: Particle Board with pvc sheet, off white (RAL 9010 or equivalent color)
Grille:

Surface-treated steel plate net, off white (RAL 9010 or equivalent color)

250 (w) x 190 (h) x 110 (d) mm  (9.84" x 7.48" x 4.33")

1.5 kg (3.31 lb)

Tapping screw (4 x 35) ................................ 2

Rated Input

Rated Impedance

Sensitivity 

Frequency Response

Speaker Component

Application Cable

Connection

Finish

Dimensions

Weight

Accessories

• To avoid electric shocks, be sure to switch off the amplifier's

power when connecting speakers.

• Do not operate the unit for an extended period of time with the

sound distorting. This is an indication of a malfunction, which
in turn can cause heat to generate and result in a fire.

• Do not stand or sit on, nor hang down from the unit as this may

cause it to fall down or drop, resulting in personal injury and/or
property damage. 

• Install the unit only in a location that can structurally support

the weight of the unit and the mounting bracket. Doing
otherwise may result in the unit falling down and causing
personal injury and/or property damage.

• Do not use other methods than specified to mount the bracket.

Extreme force is applied to the unit and the unit could fall off,
possibly resulting in personal injuries.

• Tighten each nut and bolt securely. Ensure that the bracket

has no loose joints after installation to prevent accidents that
could result in personal injury.

8 Ω

13 kΩ

6.7 kΩ

3.3 kΩ

1.7 kΩ

0

COM (white)

COM

HOT (black)

HOT

Matching 
transformer 

Input connector

COM