Toa BS-678T, BS-678, BS-678B User Manual

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

CAUTION

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

WARNING

INSTALLATION MANUAL

WALL MOUNT SPEAKERS

BS-678 BS-678T
BS-678B BS-678BT

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.

1. SAFETY PRECAUTIONS

• BS-678 series, of which cabinet is made of wood, can be installed in a vertical or horizontal orientation.

• Either concealed in-wall wiring or open 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.

• BS-678T and BS-678BT have a built-in attenuator and can be connected to a 2-wire or 3-wire system.

2. FEATURES

• 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.

Step 3. Make wiring.

3-1. Insert the lead-in cables (cables from the amplifier) and

lead-out cables (cables to other speakers) into the
push-in connector attached to the cabinet.

[Applicable

cable]

Solid wire: ø0.8 to ø1.6 mm

(AWG 20 – 14)

Stranded wire (7-core): 0.75 to 1.25 mm

2

(AWG 18 – 16)

Step 4. Hook 2 V-shaped springs attached to the baffle into the

slotted holes of the cabinet, then push the baffle onto
the cabinet.

Note

When the speaker mounting
orientation is vertical, pinch and
rotate the logo mark on the baffle
into the right position.

3-2. Insert the fasten terminals fitted at the ends of both the

HOT (black) and COM (white) cables from the input
connector on the cabinet into the taps of the matching
transformer on the speaker unit.

Connect the COM (white) cable to the transformer's
COM tap, and the HOT (black) cable to the desired
transformer's input tap. (Refer to the figure below.)

Step 2. Install the cabinet to the wall using the supplied tapping

screws 4 x 35. In this case, route the cables from a
cable entry hole.

Note

The speaker can be installed in a vertical or horizontal
orientation. Either concealed in-wall wiring or open
wiring are available for speaker cable connection.

3. INSTALLATION

Step 1. Pull out the baffle, unlatch 2 V-shaped springs, then

remove the baffle from the cabinet.

Impedance 1.7 kΩ 3.3 kΩ 6.7 kΩ 13 kΩ
100 V line 6 W 3 W 1.5 W 0.8 W

70 V line 3 W 1.5 W 0.8 W 0.4 W

Baffle

Cabinet

HOT (+)

To the next
speaker

From
the amplifier

V-shaped spring

Baffle

Cabinet

Squeeze the spring to detach
from the cabinet.

Notches for open wiring

Screws for
horizontal mounting

Cabinet

Input connector

COM (-)

9 mm

Input connector

Note: The figure shows wiring for the BS-678/ 678B.

(0.35”)

Cabinet

Matching transformer

Screws for
vertical mounting

Tapping screws 4 x 35 (accessory)

[Cabinet mounting dimensions]

Unit: mm (in)

(0.2)

3-ø5

(7.48)

190

83.5

(3.29)

250

(9.84)

83.5

(3.29)

Cabinet outside
dimensions

Cable entry hole
(for open wiring at horizontal mounting)

Cable entry hole
(for concealed wiring at horizontal mounting)

Cable entry hole
(for concealed and open wirings at vertical mounting)

HOT (black)

COM (white)

Baffle

Matching transformer

HOT (black)

1.7kΩ

3.3kΩ

13kΩ

6.7kΩ

COM

COM (white)