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
Note: When mounting the BS-678 to
plaster board walls be sure to use
Wiring Diagram sufficient "anchoring type" bolts from
Bridging Input Matching
the local hardware store instead of the
terminal connector transformer
HOT
HOT(black) 13kΩ supplied screws.
6.7kΩ 8Ω
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