So I’m new to this forum. I’m a computer engineer and I love looking at the built in amplifier ICs in mobile phones. I came across a teardown of the new Motorola X and saw it has a NXP TFA9890 High Efficiency Class-D Audio Amplifier with “adaptive sound” and Qualcomm WCD9310 Audio Codec. “It can deliver 7.2 W peak output power into an 8 Ω speaker at a supply voltage of 3.6 V. The internal boost converter raises the supply voltage to 9.5 V, providing ample headroom for major improvements in sound quality.” This is the first mobile phone amp with a DC-to-DC boosted 9.5V supply voltage.
I was just wondering what people thought of the Motorola X's built in amplifier compared to the iPhone 5 (Cirrus CS35L19 class-D audio amplifier with Apple 338S1077 Cirrus audio codec), Galaxy IV, or HTC one/x because I was planning on buying one of these phones to use as a source without DAC. Thanks guys!