I've taken apart some Logitech PC speakers in order to use the amp inside an bartop Raspberry Pi arcade game I'm making. There's something I don't understand. The donor speakers work as follows: R speaker has a 2 pin mini IEC mains input and a 9.2V PSU. It connects to the other speaker via a shielded multicore cable carrying the power and return signal. The L speaker contains the amp, has the user controls, jack, etc. audio goes via a heaphone jack then is sent to its own cone, and back to the R speaker via the multicore cable mentioned earlier.
Looking at the connections to the PCB, everything makes sense to me, apart from the fact that the shielding from the multicore is soldered to the PCB. What is the purpose of this? The speakers are obviously ungrounded. In the R speaker the there's notthing connected to the shielding.
When I'm wiring everything up in my bartop arcade, can I just snip that connection? I won't be using the multicore cable at all, as the PSU will be located somewhere totally different to the right cone.
In the picture, you can see the white/blue cables are the 9.2V DC, and the black one above those two is the one that connects to the shielding.