apt-X provides high quality coding, and in broadcast applications is suitable for AM, FM, DAB, HD Radio and 5.1. apt-X can handle up to 4 stereo pairs of AES3 audio and compress to 1 AES3 stream for transmit. apt-X offers either 16-bit, 20-bit or 24-bit resolution. For 16-bit audio, the bitrate for apt-X is 384 kbit/s (2-channel), 767 kbit/s (4-channel), 1024 kbit/s (5.1-channel), and 1.28 Mbit/s (5.1 channels plus stereo). APTX's official claim is that apt-X at 56 kbit/s rate provides a quality comparable to CD.
apt-X Lossless supports high-definition audio up to 96 kHz sampling rates and sample resolutions up to 24 bits. The codec optionally permits a "hybrid" coding scheme for applications where average and/or peak compressed data rates must be capped at a constrained level. This involves the dynamic application of a form of "near lossless" coding – but only for those short sections of audio where completely lossless coding cannot respect the bandwidth constraints. Even for those short periods while the "near lossless" coding is active, high-definition audio quality is maintained, retaining audio frequencies up to 20 kHz and a dynamic range of at least 120 dB.
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