Connection Apple TV to the analog audio stereo speakers
HDMI to VGA + Audio:
http://store.apple.com/us/product/H9139VC/A/kanex-atv-pro-hdmi-to-vga-adapter-with-audio-support

Digital Coax / Optical Toslink to Analog Audio:
http://www.amazon.com/Digital-Optical-Toslink-Analog-Converter/dp/B004C4WPXA

I like the HDMI solution - it's an unpowered device; however it's considerably more expensive.  Maybe try dx.com for a slightly cheaper alternative (search hdmi vga audio).