The enchanted bar is a quest item used during the Monkey Madnessquest. It is obtained by taking some monkey dentures, a gold bar and the m'amulet mould to Zooknock, the Royal Guard mage, at the end of a dangerous dungeon in Ape Atoll.
Zooknock will then infuse the magical powers of the dentures into the gold bar and return an enchanted bar. The player should then use this bar with the m'amulet mould on the magical flame in the dungeon below the temple to create an M'speak amulet.
If you right click "Listen" on the enchanted bar when wearing the Monkeyspeak amulet, it will say: