The document describes the TOA BS-678 wall mount speaker system. It is a double-cone speaker with a wooden cabinet and stylish, compact design. It produces high quality sound for background music and announcements. The speaker has multiple power taps and push-in connector for easy installation. Key specifications include a frequency response of 150-20,000 Hz, sensitivity of 94dB, and dimensions of 250x190x110mm.

1. BS-678
Wall Mount Speaker System
APPEARANCE AND
DIMENSIONAL DIAGRAM
R6
(R
0.
24
")
28.3 (1.11")
Top View 3 – ø20 (ø0.79")
250 (9.84") 110 (4.33") 83.5 (3.29")
83.5 (3.29")
190 (7.48")
4")
0.2
(R
R6
Fron View 3 – ø5 (ø0.2") RearView
DESCRIPTION SPECIFICATIONS
The BS-678 is a double-cone type speaker with a wooden cabinet Rated Input: 6W (100V line), 3W (70V line)
Rated Impedance: 100V line: 1.7kΩ (6W), 3.3kΩ (3W), 6.7kΩ(1.5W),
that has a stylish, compact and unobtrusive design and that delivers 13kΩ (0.8W)
highly cost-effective performance. A push-in type input connector 70V line: 1.7kΩ (3W), 3.3kΩ (1.5W), 6.7kΩ(0.8W),
13kΩ (0.4W)
allows easy cable connections and bridge wiring. The selectable
Sensitivity (1W, 1m): 94dB (500 – 5,000Hz, pink noise)
input impedance can be easily adjusted by changing the tap position Frequency Response: 150 – 20,000Hz (peak –20dB)
of the unit’s transformer. 6" (16cm) double cone speaker unit ensures Speaker Component: 6" (16cm) double cone-type
high-quality sound, making the BS-678 ideal for BGM and Applicable Cable: 600V vinyl-insulated cable (IV wire or HIV wire)
Solid copper wire: ø0.8 – ø1.6mm (equivalent to
announcement applications. It can be installed in either a horizontal AWG 20 – 14)
or a vertical orientation. Its structure permits direct wall installation 7-core twisted copper wire: 0.75 – 1.25mm2
(equivalent to AWG 18 – 16)
with screws, making the speaker unit resistant to falling even if
Connetion: Push-in connector (bridging terminal)
outward force is applied to it. 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
FEATURES (RAL 9010 or equivalent colour)
• Stylish, compact and unobtrusive design Dimensions: 250 (W) × 190 (H) × 110 (D) mm
(9.84" × 7.48" × 4.33")
• Quick and easy installation Weight: 1.7kg (3.75 lb)
• High cost-effectiveness Accessory: Speaker mounting screw (4 × 35 (0.16" × 1.38")) × 2
• Horizontal / vertical installation
• Ideally suited for BGM and announcements
Wiring Diagram
Bridging Input Matching
terminal connector transformer
HOT(black) 13kΩ
HOT 8Ω
6.7kΩ
3.3kΩ
1.7kΩ 0
COM
COM
COM(white)

2. Polar Response (Horizontal) SPL vs. Frequency
110
0° 0° 0°
10 10 10 100
30° 330° 30° 330° 30° 330°
0 0 0
90
-10 -10 -10
SPL (dB)
80
60° -20 300° 60° -20 300° 60° -20 300°
70
-30 -30 -30
60
-40 -40 -40
270° 270° 270° 50
90° 90° 90°
500Hz 1000Hz 2000Hz
400Hz 800Hz 1600Hz 40
315Hz 630Hz 1250Hz
30
20 50 100 500 1k 5k 10k 20k
0° 0° 0°
10 10 10 Frequency (Hz)
30° 330° 30° 330° 30° 330°
0
-10
0
-10
0
-10
Beamwidth vs. Frequency
60° -20 300° 60° -20 300° 60° -20 300°
-30 -30 -30
200
-40 -40 -40
270° 270° 270°
Beamwidth (deg)
90° 90° 90° 100
4000Hz 8000Hz 16000Hz
3150Hz 6300Hz 12500Hz
2500Hz 5000Hz 10000Hz
50
Polar Response (Vertical)
0° 0° 0° 10
10 10 10 20 50 100 500 1k 5k 10k 20k
30° 330° 30° 330° 30° 330° Frequency (Hz) Hor.
0 0 0 Ver.
Hor.
60°
-10
-20 300° 60°
-10
-20 300° 60°
-10
-20 300°
Directivity Factor vs. Frequency Ver.
-30 -30 -30
-40 -40 -40
20
270° 270° 270°
Directivity Factor (Q)
90° 90° 90°
500Hz 1000Hz 2000Hz
400Hz 800Hz 1600Hz 10
315Hz 630Hz 1250Hz
0° 0° 0° 5
10 10 10
30° 330° 30° 330° 30° 330°
0 0 0
-10 -10 -10
60° -20 300° 60° -20 300° 60° -20 300°
10
-30 -30 -30 20 50 100 500 1k 5k 10k 20k
Frequency (Hz)
-40 -40 -40
270° 270° 270°
90° 90° 90°
4000Hz 8000Hz 16000Hz
3150Hz 6300Hz 12500Hz
2500Hz 5000Hz 10000Hz
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