On your amp.Yes that is what it looks like
The metal jumpers are simply connecting the terminals, many people use speaker cable as that is meant to sound better. Have you some spare speaker cable you could use, or any single piece of copper wire?Well that is an absolute bummer. I have just opened the bag and there are only 3 metal terminal jumpers. I'm destined not to achieve this lol
Just a single piece of copper wire to do exactly the same as what the metal jumper is doing .Dont have any spare speaker cable, but I have plenty of old analogue interconnects (eg amp to cd player) that I no longer use. Would copper wire from them do the trick and replace the missing metal jumper?