Date: 2017-06-28
PPA DSP amplifier user manual
18
Figure 6 PPA1000 / S-PRO2 location of CON702
7.1.
PPA500 and 1000 / Pascal® T/ S-PRO Module
Use JST-VH series connectors for the speaker output
socket
Speaker Female connector: JST VHR-4N
(Farnell 630494)
Crimp Pin: JST SVH-21T-P1.1 or SVH-41T-P1.1
(Farnell 630500)
Table 1 PPA1000 / S-PRO CON702 connector
Connector
Pin
Description
CON702
1 (red dot
CH2 GND
This pin is used for the GND signal of the channel 2 speaker
CON702
2
CH2 OUT+
The amplified speaker signal of channel 2 is available on this pin
CON702
3
CH1 GND
This pin is used for the GND signal of the channel 1 speaker.
CON702
4
CH1 OUT+
The amplified speaker signal of channel 1 is available on this pin.
The S-PRO2 channel 1 and 2 are single ended amplifier designs, which can pump back energy to the power
supply rails. At low frequencies, this may cause asymmetrical power supply voltage rails, resulting in premature
clipping of the amplifier outputs or over-voltage protection of the power supply.
When both channels are used, audio input for the S-PRO2 channel 2 should be inverted as shown on Figure 7.
This will prevent the supply pumping between the two channels.
In order to maintain correct output phasing in Single Ended mode, the output of channel 2 should be phase
inverted by interchanging the + and – connections for the speaker. Phase inversion can be set in the software.
Figure 7 Inversion of 2
nd
Channel to Prevent Power Supply
Pumping