Which Amplifier Board to use with Raspberry Pi and outdoor speakers?

[southafricanrob]

Hi,
I am using a raspberry pi with a HifiBerry DAC connected via i2s and it works brilliantly, headlessly streaming Spotify and local files. I want to connect it to a set of outdoor speakers on my deck so am looking at a little amplifier board (hopefully to fit inside one of the speaker cases)

The advice I am looking for, is which if these boards would you suggest, bearing in mind the speakers are 120watt 8ohm and I'm not needing thumpingly loud audio but something good for a braai etc.

These are the boards I am looking at:
2.8W Class D Audio Amplifier - I2C Control AGC https://www.adafruit.com/products/1712
3.7W Class D Audio Amplifier https://www.adafruit.com/products/987
20W Class D Audio Amplifier https://www.adafruit.com/products/1752

I know the 20watt one will be much louder but can i get away with the smaller one based on the speakers? (specs below)


Power handling: 120W
Frequency response: 50 Hz - 22.0 KHz
Sensitivity: (+/- 3dB) 90 dB
Impedance: 8 OHMS
Driver complement: 2 ways, 2 drivers
Woofer: 5.25"
Tweeter: 3/4"
Dimensions: (HXW) 240 x 160x 165mm

Thanks very much,

 

[chrisc]

 

[scrarfussi]

 

[Moolz]