Buy plug adapaters to adapt it to your media sound system with the 100w amps. Then it might be loud enough.
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The latest version of the Nano (5th generation) has a speaker built in, and it will play out loud if you simply unplug the headphones. For earlier Nanos, you need to plug in some amplified speakers. That could be anything from the $5 Walgreens version to an expensive docking station.
Some solutions to your problem here:ipod+speakers L
Attach speakers to it.
Preferably amplified speakers, or an amplifier feeding speakers (same thing in different boxes).