Speaker too quiet

[Chinafreak]

Hello Guys,

I've there a speaker bought from BANNED, they have:

- 87dB
- 8Ω
- 0.5W
- 320Hz

It's work all fine. I've already soldered everything. But what bothers me that the speakers plays music too quite. Raspbian (RetroPie) audio volumen is on 100%.
I've taken tutorials from adafruit:

https://learn.adafruit.com/cupcade-rasp ... ce-circuit
I'm using these component:

10K resistors
100 µF capacitor
TS922 - DIP-8

Does anybody know why my speaker playing music so quite? I've used my old, broken 3DS speaker and it's playing still too quite as normal.

I'd love to get some answers. :)
Thanks,

- China