Power Rating (RMS): 15 watts continuous, 20 watts equalized
Frequency Response: 275 Hz to 14 kHz
Impedance: SPT15A — 25/70 volts SP158A — 8 ohms
Sound Pressure Level: 121 dB @ four feet on axis with 15 watt input @ 1000 Hz
Dispersion: 110º
Sensitivity as Microphone: -22 dBm [Ref: 10 dynes/cm2]
Dimensions: 9" Diameter x 9-1/4" D
Product Weight: SPT15A — 4 lb. SP158A — 3 lb.
Finish: Textured mocha enamel
Impedance Selector Switch Settings (SPT15A only): 25V @ 15, 7.5, 1.8, 0.94, 0.46 watts 70V @ 15, 7.5, 3.8, 1.8, 0.9 watts
Sound Pressure Level in dB @ 1000Hz:
Watts ------ Feet on Axis
Input:
- - - - ------ 4'- 8'- 16'- 32'- 64'
15.00W -- 121 115 109 103 97
7.50W --- 118 112 106 100 94
3.80W --- 115 109 103 97 91
1.80W --- 112 106 100 94 88
0.90W --- 109 103 97 91 85
0.46W --- 106 100 94 88 82