Project 20 (Novice): Siren with Amplifier Circuit

I built an audio amplifier circuit using the lm386 and hooked it up to a 3 watt, 8 ohm speaker. I programmed the arduino to play 4 different sirens and it's incredibly loud. An external power source (9v power adapter) will be used to power the amplifier.

Schematic: http://www.hobby-hour.com/electronics/lm386-power-audio.php