TOA BS-678 Users Manual

BS-678

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.

Wall Mount Speaker System

APPEARANCE AND
DIMENSIONAL DIAGRAM

R6 (R0.24")

DESCRIPTION

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.

FEATURES

• Stylish, compact and unobtrusive design

• Quick and easy installation

• High cost-effectiveness

• Horizontal / vertical installation

• Ideally suited for BGM and announcements

Top View

250 (9.84")

Fron View RearView

110 (4.33") 83.5 (3.29")

190 (7.48")

R6 (R0.24")

3 – ø20 (ø0.79")

28.3 (1.11")

83.5 (3.29")

3 – ø5 (ø0.2")

SPECIFICATIONS

Rated Input: 6W (100V line), 3W (70V line)
Rated Impedance: 100V line: 1.7kΩ (6W), 3.3kΩ (3W), 6.7kΩ(1.5W),

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)

Connetion:
Finish: Baffle: HIPS resin, off-white (RAL 9010 or

Dimensions: 250 (W) × 190 (H) × 110 (D) mm

Weight: 1.7kg (3.75 lb)
Accessory:

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

Solid copper wire: ø0.8 – ø1.6mm (equivalent to
AWG 20 – 14)
7-core twisted copper wire: 0.75 – 1.25mm
(equivalent to AWG 18 – 16)

Push-in connector (bridging terminal)

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)

(9.84" × 7.48" × 4.33")

Speaker mounting screw (4 × 35 (0.16" × 1.38")) × 2

2

Wiring Diagram

Bridging
terminal

Input

connector

HOT

COM

HOT(black)

COM(white)

13kΩ

6.7kΩ

3.3kΩ

1.7kΩ

COM

Matching

transformer

8Ω

0

Polar Response (Horizontal)

0°

10

30°

60°

90°

30°

60°

90°

Polar Response (Vertical)

30°

60°

90°

30°

60°

90°

330°

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

300°

270°

90°
500Hz
400Hz
315Hz

330°

300°

270°

90°
4000Hz
3150Hz
2500Hz

330°

300°

270°

90°
500Hz
400Hz
315Hz

330°

300°

270°

90°
4000Hz
3150Hz
2500Hz

SPL vs. Frequency

0°

10

30°

60°

30°

60°

30°

60°

30°

60°

330°

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

300°

60°

270°

90°
1000Hz
800Hz
630Hz

330°

300°

60°

270°

90°
8000Hz
6300Hz
5000Hz

330°

300°

60°

270°

90°
1000Hz
800Hz
630Hz

330°

300°

60°

270°

90°
8000Hz
6300Hz
5000Hz

0°

10

30°

30°

30°

30°

330°

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

0°

10

0

-10

-20

-30

-40

300°

270°

2000Hz
1600Hz
1250Hz

330°

300°

270°

16000Hz
12500Hz
10000Hz

330°

300°

270°

2000Hz
1600Hz
1250Hz

330°

300°

270°

16000Hz
12500Hz
10000Hz

110

100

90

80

70

SPL (dB)

60

50

40

30

20 50 100 500 1k 5k 10k 20k

Frequency (Hz)

Beamwidth vs. Frequency

200

100

50

Beamwidth (deg)

10

20 50 100 500 1k 5k 10k 20k

Frequency (Hz)

Directivity Factor vs. Frequency

20

10

5

Directivity Factor (Q)

10

20 50 100 500 1k 5k 10k 20k

Frequency (Hz)

Hor.
Ver.
Hor.
Ver.

Architect's and Engineer's Specifications

The speaker shall be a 6" (16cm) double cone-type speaker
suitable for wall mounting. Cable connection shall be by means
of a push-in connector (bridging terminal).

The speaker shall include a transformer having multiple taps
(0.8W, 1.5W, 3W, 6W at 100V and 0.4W, 0.8W, 1.5W, 3W at
70V) adjustable. The output sound pressure level at a distance
of 1m with a 1W input level applied shall be 94 dB SPL. The
speaker shall have a frequency response of 150 – 20,000Hz
(-20dB).

The speaker enclosure shall be constructed of particle board,
with a pvc sheet, and the baffle of HIPS. The grille shall be
surface-treated steel plate net. The speaker shall be available in
off-white colour. The unit shall have dimensions of 250 (W) ×
190 (H) × 110 (D) mm (9.84” × 7.48” × 4.33”), and a weight of

1.7 kg (3.75 lb).

The speaker shall be a TOA model BS-678.

TOA Corporation

www.toa.jp

Specifications are subject to change without notice.
Printed in Japan (0708) 833-52-384-80 u