阻抗(专业音响扩声知识).doc

GYJ25-86 JGJ57-2000 J67-2001GB/T4959-1995GB/14197-93 RASTI GB/T14476-93 GBJ76-84 JGJ/T16-92 WH/T0204-99 GBJ232-90 92(GB15734-1995) GYJ25-86 1254000 Hz98dB1254000Hz4dB1254000Hz8dB 100Hz8dB 1000 Hz6300 Hz6dBNR25 ,dB 24dB 3dBSound PressurePaWSound Pressure Level10 2dBPowerWFTC20Hz20KHz1%* 20Hz-0.05 * 50Hz-0.02 * 1000Hz-0.001 * 7000Hz-0.0014 1000Hz 0.05%0.120Hz20KHz 0.1%ASHLY FTX2001 1. 2. 3. 4. 5. WAESAES-1984EIAANSIANSI-S4.26-19882 10 12dB * RMS1 * 1 3dB2 * 0.1 6dB4 SPL1W/1KHz dBSPL 6dB dB1. 3dB2. 6dB3. 6dB1. * -86.5dBu20Hz20kHz* THD90dB1KHz* +22dBu* +28dBu* +22dBu* 1.3k* 10k* 1202. Q 20Hz20kHz 10 15 27 31 10 15 2/3 31 1/3 * -92dBu20Hz20kHz* THD0.01%+20dBu* -80dBu20Hz20kHz* 2.5dB* +23dBu* +23dBu* 20k10KHz* 200100?* 3%* 1/3 * 6dB1. * V=W* W=V2AES/ANSIA 600W RMSES/ANSI8A V=600W8= 4800= 69.28V 69.28 V 8 600W RMS 69.28 VA 2. * =V/VdB A 0.775V31VA =V/V =31V/0.775V =40 B 0.5V20VB =V/V=20V/0.5V =40AB 403. * V=V/ A A A FTC 550W840 A 600W RMSAES/ANSI850W* 1A A V=550W8 = 4400 = 66.33V* 2A A V=V/ =66.33V/40 = 1.65VA 1.65V 66.33V8 550W A 1.65VA 1.65V A 1.65V 1.65V A A 66.33V 66.33V=550W81.65V 1.65V6.5dBu A B A FTC 550W840 A 400W RMSAES/ANSI8150W* 1B B V=400W8 = 3200 = 56.56V* 2A A V=V/ =56.56V /40 1.41V A 1.41V 56.56V8 400W 1.41VA 1.41V A 1.41V 1.41V A A 56.56V 56.56V=400W81.41V1.41V5.19dBu4. 0dB dB 5. AES/ANSI 6dB100W400WFTC 3dB100W200W 400W FTC 200