[Laser] Kicking up the power?

[KD7JYK DM09]

I have several infra-red audio transmitters.  They are dual channel, two 
near-IR LEDs per channel.

How can I use these to drive a larger array that may draw several amps?

Each channel has a common ground, then a left and right trace from the 
modulator.  Anyone have any high current driver schematics or ideas?

The transmitters already have modulators and low-power drivers to feed the 
four LEDs, I need a way to get the audio/carrier into a LOT of LEDs.

Thanks.

Kurt