I have the A31.2 and there isnt much difference to the A30.2. When I orderd my Primare gear from Hi-fi Bitz back in August last year, I was suppose to get the A30.2, but got the upgraded A31.2 instead. Due to me having to wait 2 months for the goods, I decided to accept it from Hi-fi Bitz. I e-mailed Primare and they told me that the main dfference between the two is that the signal path on the A31.2 is shorter, thus producing a clearer pathway for the signal to the speakers and this amp is not bridgeable meaning that it cannot be used in conjuction with other power amp for more rms. As for the rest of the specs, exactly the same.