Toa BS-678, Specifications

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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.
SPL vs. Frequency
Directivity Factor vs. Frequency
Beamwidth vs. Frequency
110
100
90
80
70
60
50
40
30
20 50 100 500 1k 5k 10k 20k
Frequency (Hz)
SPL (dB)
200
100
50
10
20 50 100 500 1k 5k 10k 20k
Frequency (Hz)
Beamwidth (deg)
Hor.
Ver.
20
10
5
10
20 50 100 500 1k 5k 10k 20k
Frequency (Hz)
Directivity F
actor (Q)
Hor.
Ver.
Specifications are subject to change without notice.
Printed in Japan (0708) 833-52-384-80 u
TOA Corporation
www.toa.jp
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
500Hz
400Hz
315Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
1000Hz
800Hz
630Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
4000Hz
3150Hz
2500Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
8000Hz
6300Hz
5000Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
16000Hz
12500Hz
10000Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
2000Hz
1600Hz
1250Hz
Polar Response (Horizontal)
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
500Hz
400Hz
315Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
1000Hz
800Hz
630Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
4000Hz
3150Hz
2500Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
8000Hz
6300Hz
5000Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
16000Hz
12500Hz
10000Hz
60
°
30
°
0
°
330
°
300
°
270
°
90
°
10
0
-10
-20
-30
-40
2000Hz
1600Hz
1250Hz
Polar Response (Vertical)