Frequency Response; Amplification Frequency Response; Amplitude Non-Linearity; Noise Interference - Electro-Voice CPS 3 Service Manual

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
INPUT A/B
INPUT A/B
Distortion-limited transmission range (performance bandwidth)
• THD = 0.1 %, 1/2 nominal power at 4 ohms, MBW = 500 kHz
Input
INPUT A/B
G. PHASE RESPONSE
H. INPUT IMPEDANCE
I.

AMPLITUDE NON-LINEARITY

nominal overall distortion
standard overall distortion
IMD-SMPTE
DIM 30
DIM 100
J. CROSSTALK - at f = 1 kHz
K. DAMPING FACTOR - internal at f = 1 kHz
L. SLEW RATE - internal
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
U(F) < 550µV
< 1.84 mV
U(G)
U(A) < 440µV
i.s.=0dBu
U(A) < 220µV
i.s.=6dBu
U(A) < 120µV
Gain=26dB
The S/N ratio (A-weighted) at max. output voltage at 4Ω is >103 dB.
Output
SPEAKER A/B
SPEAKER A/B
Output
SPEAKER A/B
Amplitude non-linearity
<0.05 %
<0.02 %
<0.01 %
<0.01 %
<0.01 %
less than
at f = 100 Hz
S/N ratio
> 100 dB
> 89.7 dB
> 102 dB
> 108 dB
> 113.5 dB
f (u) f (o)
<10 Hz 75 kHz
20 Hz 35 kHz
f (u) f (o)
<10 Hz 50 kHz
±30° (20 Hz - 20 kHz, HI/LO-CUT off)
20 kΩ (20 Hz ... 20 kHz)
Equivalent input Equivalent input
interference interference level
voltage
< 7.5µV
< 25µV
< 6µV
< 6µV
< 6µV
2
Remarks
HI-LO-CUT Off
HI-LO-CUT On
Remarks
HI-LO-CUT Off
Remarks
MBW = 80 kHz, f = 1 kHz
MBW = 80 kHz, f = 1 kHz
60 Hz, 7 kHz
3.15 kHz, 15 kHz
3.15 kHz, 15 kHz
<-70 dB
>300
>400
>35 V/µs
Residual
interference
output voltage
< -100 dBu < 350µV
< -89.7 dBu < 1.23mV
< -102 dBu < 320µV
< -102 dBu < 160µV
< -102 dBu < 90µV