Thanks for replying, I also wrote some kind of clarification of what I am trying to accomplish as apparently I have not been clear enough in my first post (sorry)

Let's see I'll try to explain step by step what I try to accomplish.

I have a main receiver Yamaha RX-A810 as the heart of my AV stuff. This receiver is a 7.2 system that can act as a 2 zone receiver (5.1 + 2.1) which is the way I have settled it. See pic:


Unfortunately, both subwoofer jacks output sound at the same time ALWAYS, independent of if Zone 2 is active or not. The main Zone in my setup is the living room, whereas the Zone 2 is the bedroom. If I use a cable to switch ON the second subwoofer (Yamaha YST-FSW150) whenever the receiver is ON, I would have booming noise coming from that 2nd subwoofer always, either if the 2 speakers in Zone 2 are active or not, which is exactly the same as leaving the 2nd subwoofer ON all the time independent of the main receiver.

Now, I use a Universal Electronics Nevo S70 (see [Link: avland.co.uk])
to control all the devices in my AV system, and I also own two Universal Electronics NC-50. As one of them was not in use I thought of using it, connected to the subwoofer through a link cable (in the bedroom) to switch ON the 2nd subwoofer ONLY whenever I want sound in Zone 2 (Bedroom)

I have created a macro in NevoStudio Pro (the program to configure the Nevo S70 and the Nevo NC-50) that would send an ON command to the 2nd subwoofer from the Nevo NC-50 everytime I hit the 2nd ZONE ACTIVE button or the PARTY button on the remote. Unfortunately this 2nd subwoofer does not have a remote controller per se, so I cannot find this model in the Universal Electronics database, nor copy the function from another existing remote. I have found that this subwoofer was also sold by Yamaha together with a Sound Bar and could be connected with a link cable, that Sound Bar was model YSP-1100, and I have found that model is in the Universal Electronics database, so I've used that code for the macro. As said unfortunately it does not work the way I want it to work, as when I execute the macro with the my remote (Nevo S70), the NC-50 sends the ON code to the 2nd subwoofer, and I can hear the clicking noise and the light ON but only for half a second or so. That makes me think that the remote link jack in the subwoofer is waiting for a continuous 12v signal to keep the subwoofer ON, and when that signal is not present switches it OFF. That is why I am asking if there is a way to make the NC-50 sends that signal, or if not use some kind of realy and a 12v adapter