There's not a "best" setting to use - the settings you use are based on your installation, system configuration, and listening preferences.
That being said, with cheaper amplifiers like this, there are some basics that I can give you.
Crossover
Your crossover prevents frequencies your subs can't effectively reproduce from being passed through to the drivers. There's two basic ways to implement a crossover in a car audio system. You MUST use one of them.
- Most headunits have a built-in digital (active) crossover that can be set inside the radio's settings. This type is preferable due to the better waveform characteristics that ultimately get sent to the drivers after being amplified. If you don't have or don't want to use this method than use option 2.
- There will be a passive crossover dial/knob (or on very cheap amps it may simply be a switch) on your amp that can be used to set the crossover frequency.
What frequency you use is somewhat subjective, but a safe bet for subs is to keep it under 100hz. The larger the speaker, the lower the frequency. (100Hz should work well for your 10's)
Gain
- Set your gain no higher than 80%
- To find the safe threshold, play music with some heavier bass and increase your radio volume until you begin to hear distortion in your mid/high range. Back the volume down until the distortion resolves.
- On your sub's amplifier, with everything hooked up, gradually increase the gain until you start to hear distortion/clipping from the subs. Back the gain down until it resolves
Other/Misc.
- Do NOT use "bass boost" or "loudness" settings that many cheap amps come equipped with. These artificially bump-up the output of your system and almost always produce "dirty", distorted, and damaging waveforms that will drastically reduce the quality of sound and the life-span of your speakers. If you find yourself needing to use them to get the effect/volume you want, you either have your settings incorrect, or (more likely) need to simply invest in higher-power/quality hardware.
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