27
XP1000/XP2500/XP3500
3. 6 Frequency response
Input signals are each 20Hz, 1kHz and 20kHz, -10dBu. The output voltage shall be -0.5 +/- 0.5dB at 20Hz and 20kHz
compared to the 1kHz.
Set HPF switch to 20Hz.
With 20Hz -10dBu input signal, output voltage shall be -3.0 +/- 2.0dB compared to the value with 1kHz -10 dBu input
signal at HPF switch OFF.
Set HPF switch to 55Hz.
With 55Hz -10dBu input signal, output voltage shall be -3.0 +/- 2.0dB compared to the value with 1kHz -10 dBu input
signal at HPF switch OFF.
3.7 Distortion
Factor
Input signals are each 20Hz and 20kHz, the distortion shall be less than 0.1% when output level as follows.
This inspection should have been finished within 30 seconds.
3.8 Cross
talk
Input signal is 1kHz to the channel A, and connect between the input terminals of channel B (2pin-hot and 3pin-cold)
by 600 ohms. Set the output level of channel A as following
Output level of the channel signal applied
.
The output voltage of channel B shall be less than following
Output level of the channel terminated with 600 ohms
The conditions of channel A and channel B are replaced and inspected. Both the load resistor and the measurement
instruments shall be connected to 5-way terminals (SP303). DIN AUDIO filter shall be used for the measurements.
3.9
Output Noise level
Connect between the input terminals (2pin-hot and 3pin-cold) by 600 ohms. The noise level of the output terminal shall
be less than -65dBu. Set the input attenuator to MIN. The noise level shall be less than -70dBu. DIN AUDIO filter shall
be used for the measurements.
3.10 Stability
Connect only capacitance of 0.01uF(Polyester film capacitor) to output terminal. The overshoot and the ringing should
be as follows. Input signal is 1KHz, -10dBu square wave.
Overshoot Vp/Vo < 2.5
Ringing: within 7 waves and no oscillation
XP3500
XP2500
XP1000
28.29 V
(350 W + 350 W)
44.73 V
(250 W + 250 W)
52.92 V
(100 W + 100 W)
XP3500
XP2500
XP1000
28.3 dBu
(175 W)
32.3 dBu
(125 W)
33.7 dBu
(50 W)
-41.7 dBu
-37.7 dBu
-36.3 dBu
Output level of the channel
signal applied
Output level of the channel
terminated with 600 ohms
Vo
Vp
･･･
Ringing Waves
