For the stereo (BTL) PCB layout, see examples in the Layout section.
A 2.0 system generally refers to a system in which there are two full range speakers without a separate amplifier path for the speakers which reproduce the low-frequency content. In this system, two channels are presented to the amplifier via the digital input signal. These two channels are amplified and then sent to two separate speakers. In some cases, the amplified signal is further separated based upon frequency by a passive crossover network after the L-C filter. Even so, the application is considered 2.0.
Most commonly, the two channels are a pair of signals called a stereo pair, with one channel containing the audio for the left channel and the other channel containing the audio for the right channel. While certainly the two channels can contain any two audio channels, such as two surround channels of a multi-channel speaker system, the most popular occurrence in two channels systems is a stereo pair.
It is important to note that the SmartAmp Flows which have been developed for specifically for stereo applications will apply the same equalizer curves to the left channel and the right channel. This minimizes the needed RAM capabilities of the SmartAmp.
When two signals that are not two separate signals, but instead are derived from a single signal which is separated into low frequency and high frequency by the signal processor, the application is commonly referred to as 1.1 or Bi-Amped systems. The 2.0 (Stereo BTL) System application is shown in Figure 51.