Can someone tell me what size speaker terminal are on the above receivers? I presume both have the same. I'm looking to buy some banana plugs but I'm unsure of what size to get (3mm, 4mm, 5mm or greater).
The Pioneer Amps use 4 mm banana sockets.
The easiest way to remove the inserts is a small drill bit.
Find one that's a tight fit say 2.5mm, wind it into the insert by hand, then pull straight out. Rather like pulling a cork from a bottle of wine.