Shady reviewed those at about 88dB sensitvity.
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If you have some boundary support and perhaps only lose 3dB per doubling of distance, at 12' you might be down ~6dB. 128w should be hitting dynamic peaks of around 103dB at your LP, just a hair below Reference Level Spec.
Do you need an Amp? My estimation is no as I stated before: it will not change your Sound Quality. If you want some headroom for Dynamic peaks while listening to Multi-Channel Programs, then sure...
...You may benefit from an Amp capable of delivering 200w pr Ch to your mains. Make it a 3-channel and cover your Center, too. That leaves your Surrounds to draw the main Amplification power from the Amp Stage of the AVR.
That's how I approached my needs. In reality, I probably barely use my Amps at all when listening to music. Even for HT, I probably only come close to tapping their potential on very rare occasions.
Did I expect my Outlaw Monoblocks to change the SQ of my Speakers? NO!