A good rule of thumb for matching amplifiers to speakers is is to power the speaker 25% (for high-power speakers, increase to 50%) over its rated RMS value. That is to say if a speaker is rated to 50Watts RMS 1Watt/1Meter then you should power it with an amp capable of 62.5Watts RMS (75Watts respectively). It is better to over power a speaker than to underpower. Yes, you can damage a speaker by cranking too much power with the gains up and too much distorted bass. You have to match the gains with the head unit to about 75% of the volume level and tune the bass levels down. On the flip side, you can burn up an amplifier by overdriving at distorted levels.
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