Game Grrl with speaker

I didn't like how the gamegrrl was made without a speaker. I added a small amp like this one. http://www.suntekstore.com/goods.php?id=10019845&utm_source=gbus&utm_medium=paid

I powered the amp from the same 5.2V output from the voltage booster, I connected the input to the headphone jack on the pi and wired the speaker to r- and r+. You can hook the speaker up to L- and L+ if you want. Just don't hook up both speakers to both outputs. I added a 10K resistor between the speaker and the amp ou