USB recording not loud at all from 3W speaker being driven by 2.5W amp

[/RaspberryPi]

I'm recording using a USB mic that has the input set to 100%, then using this 2.5W amp to drive this 3W 4Ohm speaker. The sound is not loud at all and I have to have my ear right up next to the speaker to hear anything. The input + output volumes are set to 100%, and the pot on the amp is turned all the way up.
I'm retrofitting an old rotary phone but this isn't giving me the volume / clarity I expected.
I've tried various recording options through arecord and pacat but nothing is giving me great results.
Is there a better setup I should be using or do I just have crappy components?
Here is my circuit setup and a simple circuit diagram.

submitted by /u/inexplicability
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