Electro-Voice CONTRACTOR PRECISION SERIES, Руководство по обслуживанию

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F. FREQUENCY RESPONSE
• -3 dB level drop, referenced to the level at the standard frequency of 1 kHz
• the power amplifier's border frequencies are at 13 Hz and 40 kHz respectively, referenced to -1 dB
Amplification frequency response
Input
Output f (u) f (o) Remarks
INPUT A/B SPEAKER A/B <10 Hz 75 kHz HI-LO-CUT Off
INPUT A/B SPEAKER A/B 20 Hz 35 kHz HI-LO-CUT On
Distortion-limited transmission range (performance bandwidth)
• THD = 0.1 %, 1/2 nominal power at 4 ohms, MBW = 500 kHz
Input Output f (u) f (o) Remarks
INPUT A/B SPEAKER A/B <10 Hz 50 kHz HI-LO-CUT Off
G. PHASE RESPONSE ±30° (20 Hz - 20 kHz, HI/LO-CUT off)
H. INPUT IMPEDANCE 20 k
Ω
(20 Hz … 20 kHz)
I. AMPLITUDE NON-LINEARITY
Amplitude non-linearity Remarks
nominal overall distortion <0.05 % MBW = 80 kHz, f = 1 kHz
standard overall distortion <0.02 % MBW = 80 kHz, f = 1 kHz
IMD-SMPTE <0.01 % 60 Hz, 7 kHz
DIM 30 <0.01 % 3.15 kHz, 15 kHz
DIM 100
<0.01 % 3.15 kHz, 15 kHz
J. CROSSTALK - at f = 1 kHz less than <-70 dB
K. DAMPING FACTOR - internal at f = 1 kHz >300
at f = 100 Hz >400
L. SLEW RATE - internal >35 V/µs
M. NOISE INTERFERENCE
- U(F) = external voltage un-weighted with B = 22 Hz … 22 kHz, effective value (IEC 268-1)
- U(G) = noise voltage, frequency-weighting filter according to CCIR-468-3, quasi peak weighted (IEC 268-1)
- U(A) = interference voltage A-weighted, dB(A), effective value (IEC 268-1)
- Signal-to-noise ratio referenced to a nominal output voltage of 55.6 V (800W/4ohms)
-
HI/LO-CUT ON, GND LIFT = GROUNDED
Interference
output voltage
S/N ratio Equivalent input
interference
voltage
Equivalent input
interference level
Residual
interference
output voltage
U(F) < 550µV > 100 dB < 7.5µV < -100 dBu < 350µV
U(G) < 1.84 mV > 89.7 dB < 25µV < -89.7 dBu < 1.23mV
U(A)
i.s.=0dBu
< 440µV > 102 dB < 6µV < -102 dBu < 320µV
U(A)
i.s.=6dBu
< 220µV > 108 dB < 6µV < -102 dBu < 160µV
U(A)
Gain=26dB
< 120µV > 113.5 dB < 6µV < -102 dBu < 90µV
The S/N ratio (A-weighted) at max. output voltage at 4
Ω
is >103 dB.
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