Rig an iPhone to old speakers?

I have no idea if this is possible or not, but I've tried and failed enough times that I figured it's time to ask. A pair of JVC speakers from about 1990 with positive and negative terminals on each + old Sony headphones stripped to reveal the wires + phone = music somehow?

The iphone doesn't put out enough current by itself to drive the speakers. They require considerably more power than headphone speakers do.

But you can do it with a small amplifier. Most electronic audio stores should have something like that.

Sure, you just need to put an amplifier in between. The headphone jack is line-level which is far too weak to power an audio speaker.

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