The best should be to boost your ac3 a bit. You have to extract it from the container (AVI i presume), then use a software to rework the AC3 (increase its volume) and then mux the AC3 again.
To extract an AC3 you have both GraphEdit (hard) or AVI-Mux (easy but not friendly the first time) that allow to mux or demux ac3 file in a couple of clicks.
Then use Besweet to boost your AC3. You have to watch out not to lose the 5.1 if yours has one, otherwise you'll get a 2Ch ac3 channel. There are tutorials on the net to do this.
Then you remux with Avi-mux.
Pretty simple when you are used to do it but in your case you maybe should do what QuietSeb suggests or more efficiently increase the volume of your speakers. ;)
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