8
IS Series + SP 12.1P Operating Manual
IS 2.8P Specifications
Transducer 8 x 2-inch (51 mm)Neodymium
Frequency Response
(–10dB limits
)1
115 Hz – 20 kHz
Sensitivity (ref 2.83V)
1, 2
88 dB
Nominal Impedance 8 Ω / 32 Ω switchable
Maximum Continuous SPL, @
a MIV (continuous / peak)
1, 2, 3
104 dB / 115 dB
Maximum Continuous SPL,
calculated from power
handling (continuous
/peak)
1, 2, 3
109 dB / 115 dB
Maximum Input Voltage
(MIV)
1, 2
28 dBV, 25.1 V
(equivalent to 80 W
into rated impedance)
Power Handling 120 W
Beamwidth
4
Horizontal: 190°
Vertical: 30°
Directivity Index (DI)
4
14.4 dB
Directivity Factor (Q)
4
27.4
Input Connectors
2 x ¼-inch (6.3 mm)
phone jack
1 x 2-position Euroblock
Mounting Provisions
IS-TWM Tilt Wall Mount
IS-FWM Flush Wall Mount
Bracket (included)
Enclosure Material Aluminum
Dimensions (HxWxD)
24.00 in. x 2.76 in. x 3.54 in.
610 mm x 70 mm x 90 mm
Net Weight 6.4 lbs. / 2.9 kg
Recommended amplifiers
Single-ch.: nXp 400 or higher
Bridged: nXp 150 or higher
Pema 4125, 4250, 8125, 8250
1) With recommended processing (see previous page)
2) Referenced to 1 m
3) The maximum input voltage (MIV) is determined by no more than a 3 dB
change in the frequency response of the loudspeaker system
4) Averaged from 400 Hz to 10 kHz
100 1k 10k
100
90
80
70
60
Sound pressure, Level [dB]
20 50 200 500 2k 5k 20k
95
85
75
65
100 1k 10k
180
120
60
0
-60
-120
-180
Sound pressure, Phase [deg]
20 50 200 500 2k 5k 20k
150
90
30
-30
-90
-150
100 1k 10k
100
90
80
70
60
Sound pressure, Level [dB]
20 50 200 500 2k 5k 20k
95
85
75
65
Listening Window, Processed
Frequency
Response
(On-Axis)
Phase
Response
(On-Axis)
Frequency
Response
(Listening
Window)