I bought a pair of RCF 312a's last year, took them home from the shop, took them out of their boxes and heard something rattling around inside. I immediately took it back to the shop, there wasn't any rattling when i got it back to the shop though , however they removed the amp at the back and stuck to the back of the magnet was a pole screw that i hadn't even noticed was missing from the outside.
Now why someone thought to throw it inside rather than screw it into the thread i'll never know.
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