james_aa,

In some respects you are asking for us to help you specify a car that is "totaly safe". The reality is that the operator is responsible for safe operation.

If the sound is clean, you will probably not damage the speaker. (I'm assuming that this is a decent quality product, and they are not hard to purchase from many, many manufacturers). An interesting counter intuitive rule of thumb is that: if the tweeter is damaged, the amplifier is too small. If the woofer is damaged, the amplifier is too large.