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Usually the ohms rating is the minimum the amp is safe with (as when you reduce resistance you increase current) so you are going the safer direction here by using an 8 ohm speaker. So for a 300W amplifier through a 4ohm speaker, using Power = Current squared X Resistance, you can supply up to around 8A. Using your 8ohm speaker the same equation gives your ...

If you're using active electronics, as silly as this sounds, verify that the battery isn't dead. I had a similar issue with my first bass, and it turned out to be the 5 dollar 9-volt battery-swap fix. After verifying that, as stated in the previous answer, see if you can pad the input somehow to make sure that you're not slamming the preamp.

The pickups could be clipping the input gain stage of your amplifier. I doubt it has anything to do with the knobs, since active electronics can give out a very hot signal. Can you give us more information on what you're using for an amplifier? What active electronics are you using, specifically? I doubt you'll kill the speakers if it is input clipping ...

Sounds like you are overloading the pre amp.Just as a guitarist would when turning up the pre-gain.To clean up that sound, he would turn the volume down at the guitar.At that point, the guitar volume pot. becomes a sort of distortion control. What's wrong with leaving the bass guitar volume down enough to achieve a clean sound, and turning up the amp? On ...

If your amp is specified for 300W @ 4 Ohm, it means that your amp was designed for a speaker with 4 Ohm. Assuming a constant load, this would be about 9A @ 35V (rounded). It's a common misunderstanding that audio amps were impedance matched to the speakers, i.e. that their internal resistance would be the same as the speaker's resistance. Instead, amps ...