I am working on an audio project with split +/-12V supplies and now have a line level output that I would like to connect to a power amplifier like the TDA8552 to drive a couple of 8R 1Wspeaker. The AMP has an input rated for -0.3V to VDD+0.3V with a set gain of 20dB so I was going to attenuate the signal enough so it doesn't overdrive the speakers at max volume. Im guessing that since it's line level and could be 2.82Vrms(4Vp-p) MAX and I need 2.82Vrms across the 8R speaker to get the maximum 1W power I want, I should attenuate the signal by 20dB? Am I on the right track?
Also, how does the amplifier treat the negative part of the AC signal? Does it get amplified or does it need to be above ground level or removed? I am a bit confused about how to interface this -/+ audio signal to this signal supply AMP.
Any comments greatly appreciated