Speaker Strobes

Loudspeaker Test
Report
Manufacturer:
System Sensor
Type:
Recessed wall mount
Model:
SPSW
For:
System Sensor
Report No.:
R1843/LS/SPSW
Prepared By:
C.Nicolaides B.Sc
July 2009
 AMS Acoustics, London
 AMS Acoustics, London
1.00
Object
1.01
2.00
The object of this Report is to present measurements of the acoustic
performance of the SPSW device.
Scope
2.01
The following characteristics were measured
•
•
•
•
•
On-axis (reference axis) frequency response
Polar response
Impedance
Applied voltage
On-axis 3rd octave band sound pressure level
from which the following are calculated:
(i)
Directivity Index [dB], tabulated and graphical
(ii) Directivity factor, Q
(iii) Effective octave and wide band (100Hz to 10kHz) impedance
(iv) Octave band Sensitivity [dB @ 1m, 1W/oct]
(v) Wide band Sensitivity:
dBA @ 1m, 1W
dBlin @ 1m, 1W
250Hz-4kHz @ 1m, 1W
Speech shape @ 1m, 1W
(vi) Acoustic Power [dB-PWL @ 1W], tabulated and graphical
(vii) Octave band Power Apportionment [%]
(viii) Impedance bode plot
(ix) Expected maximum Sound pressure level [dB @ 1m]
(assuming no compression)
(x) Frequency response chart
(xi) Polar response charts.
 AMS Acoustics, London
3.00
4.00
5.00
Method
3.01
The device was mounted in Free Space as shown in figure 1 Mounting Method C.
3.02
The measurements were made in an anechoic chamber.
3.03
Measurements were made as detailed in AMS Test Method
document No. IR/1a/LS/Meth.
3.04
All measurements were made in general accordance with BS EN
60268: Part 5: 2003.
Results
4.01
The On-axis 3rd octave frequency response of the device is shown
graphically.
4.02
The Impedance bode plot of the device is shown graphically.
4.03
Polar plots of the device are shown graphically.
4.04
Tabulated values of Directivity index, Directivity factor, Sensitivity,
Acoustic Power, Power Apportionment, Impedance and Maximum
SPL are shown in the Summary data sheet.
4.05
The Directivity Index has been calculated using Gerzon’ equal angle,
weighted area method.
Notes
5.01
Sensitivity
The octave band sensitivity is produced in its useful form for
calculations. It should be noted that the octave band sensitivity is
given as dB @ 1m, 1W/Oct. To determine the output when only the
overall power is known, then only the overall dBA or dBlin values
should be used. For more detailed information, refer to AMS
Acoustics Data Sheet ‘Loudspeaker Sensitivity – Interpretation of
Results’.
5.02
Polar Plots
For convenience, each polar plot has been normalized to 0dB. For
this reason, caution is advised when comparison of levels between
octave bands are made. The reference axis frequency response
should be used for comparison purposes.
 AMS Acoustics, London
6.00
Engineers Notes & Observations
The reference point is located at the centre of the loudspeaker driver, in line
with the baffle board.
The reference axis is normal to the grille, in line with the reference point.
The impedance does not fall to below 80% of the rated impedance within the
frequency range 89Hz to 11.2kHz.
 AMS Acoustics, London
Loudspeaker Information
Manufacturer :
Model Code :
Type :
Colour :
Serial No. :
Batch No. :
Other Markings :
Backbox :
Grille :
Weight (grams) :
Depth (mm) :
Width (mm) :
Height (mm) :
Special Features :
System Sensor
SPSW
Recessed wall mount
White
NM
NM
NM
As supplied
As supplied
640
77 mm
128 mm
150 mm
Strobe light.
Internal Details
Driver Types/Sizes :
Driver Serial No.(s) :
Driver Markings :
Damping Material :
Available Tappings :
NM
NM
NM
NM
70.7V: 0.25W, 0.5W, 1W, 2W
Electrical Details
Resonant Frequency(s) :
Cross-Over Frequency(s) :
Nominal Impedance (ohms):
Inductance :
Capacitance :
See impedance plot
NA
2500
NM
NM
NM = Not Measured, NA = Not Applicable
 AMS Acoustics, London
Manufacturer :
Model Code :
Mounting :
Transformer Tapping :
Effective Impedance :
Measurement Distance :
System Sensor
SPSW
HalfSphere
2W
2757
1.4m
Reference Axis Located at : 0 degrees
Frequency (Hz)
Parameter
Axial Q
Directivity Index (dB on Axis)
Sensitivity (dB @ 1m, 1W/Oct)
Sensitivity(dB @ 1m, 1W)250Hz-4kHz
Sensitivity(dB @ 1m, 1W)Speech Shape
Acoustic Power (dB-PWL @ 1W)
Apportioned Power (%)
Effective Impedance (Ohms)
Expected maximum SPL (dB @ 1m)
125
1.0
0.0
73
250
1.6
2.0
89
500
1.8
2.6
85
1k
1.4
1.5
81
2k
3.6
5.6
94
4k
7.4
8.7
94
8k
2.1
3.2
82
76
16
2381
68
90
14
2833
84
85
15
2506
80
82
15
2397
76
91
15
2570
89
87
13
2937
88
80
10
3903
75
Test Signal: Pink noise(100Hz-10kHz, 3rd octave bands)
Directivity Index
25
20
dB
15
10
5
0
-5
-10
125
250
500
1k
2k
4k
8k
Frequency, Hz
Acoustic Pow er
dB-PWL @ 1W
105
100
95
90
85
80
75
125
250
500
1k
Frequency, Hz
2k
4k
8k
dB
dBA
89
91
86
90
91
82
92
93
 AMS Acoustics, London
SPSW
Band Limited Frequency Response
(Norm alised to 0dB)
5
0
Relative Level, dB
-5
-10
-15
-20
-25
-30
-35
-40
63
125
250
500
1000
2000
4000
8000
16000
IEC 3rd-Octave Frequency, Hz
Impedance Bode Plot
6000
90
75
5000
60
Impedance, ohms
4000
30
15
3000
0
-15
2000
-30
-45
1000
-60
-75
0
1
10
100
Frequency, Hz
1000
-90
10000
Phase Angle, degs
45
 AMS Acoustics, London
SPSW
125Hz
250Hz
0
0
340
330
320
310
Left &
Bottom
300
350 0
10
20
Right &
Top
30
40
-10
50
290
70
-30
270
-40
260
250
80
280
90
270
100
260
Horizontal
190
180
170
160
300
50
110
120
130
220
140
210
200
Vertical
190
180
20
330
320
310
30
50
260
250
80
280
90
270
100
260
230
170 160
180
70
110
240
120
230
220
130
140
200
190
30
330
320
40
50
-40
260
250
80
280
90
270
100
260
230
220
160
70
110
120
220
30
130
210
330
320
40
60
180
170
160
140
260
250
280
90
270
100
260
110
240
120
230
130
220
140
170
160
150
340 350
0
10
20
30
40
-10
50
60
- 20
290
80
-40
180
190
300
70
-30
190
200
150
310
290
200
90
100
0
20
-20
210
80
-40
230
50
270
60
A-Weight
10
310
280
40
-30
150
-10
300
30
50
0
330
320
20
-10
-20
8kHz
0
10
240
130
140
170
350 0
250
120
350
160
290
110
240
340
300
70
340
170
310
60
180
180
150
0
20
-30
190
90
100
210
290
200
80
-40
140
-20
210
60
4kHz
10
-10
270
40
50
0
280
30
-20
2kHz
300
20
-10
-30
130
150
10
250
120
340
150
290
110
240
340
350 0
300
60
-40
330
320
310
160
1kHz
10
40
350 0
170
0
0
70
210
200 190
90
100
240
-30
220
80
-40
230
290
270
60
70
150
-20
280
40
-20
500Hz
350 0
340
330
320
-10
310
30
-30
130
140
210
200
20
-10
250
120
230
220
10
290
110
240
340
300
60
-20
280
330
320
310
350 0
70
- 30
80
90
- 40
100
250
110
240
120
230
130
220
140
210
200 190
170 160
180
150
 AMS Acoustics, London
SPSW
Wide Band Frequency Response
Note: The wide band frequency response is derived using MLS methods and does
not necessarily relate to the sensitivity values given in the summary table.
Signed:
Countersigned:
 AMS Acoustics, London
Loudspeaker Mounting Methods
Backbox
Driver & Grille
Mounting Method A
Loudspeaker Mounted
in a Reflective Baffle
Mounting Method C
Loudspeaker Mounted
on a Reflective Baffle
Mounting Method B
Loudspeaker Mounted
in an Absorbent Baffle
Mounting Method B
Loudspeaker Mounted
on an Absorbent Baffle
Mounting Method E
Loudspeaker not Attached to any
Surface and Radiation Unaffected
by nearby Reflecting Surfaces