I wonder if you can help me. I'm considering buying the Earthquake Sound SN-51 speaker package. I see that it has a built-in 500W amplifier. But it doesn't come with a separate tuner, etc. Can I just plug a regular tuner-amp (that all of my sources plug into) into the SN-51, or is it going to blow up if I send an already-amped signal into the SN-51's amplifier? Thanks in advance.