Supersonic and level on an amp?

[nicejeans486]

Im getting into this car audio but id like to know what does supersonic do/effect? What is it in general? Id also want to know what level does/effect? and what is it in general? Would should level and supersonic be set to? Just a couple of settings on my amp id like to know more about

[N2Audio]

It's SUBsonic. "Sub" as in "below" and "sonic" as in "sound". Scientifically subsonic means a speed that is below the speed of sound, but like the audio industry likes to do - we bastardized it and made it mean a frequency below human hearing. Technically it should be "infrasonic", and a few brands correctly use that term.

But I'm not answering your question --
The SSF should be set according to your enclosure type. It is intended to "cut" or "rolloff" the frequencies that your subwoofer can't safely play.
In a sealed box there's really no danger. The air in the box keeps the sub pretty well controlled. So if your box is sealed the SSF can be turned off, or set really low -- 20ish.

If the box is ported it only controls cone movement down to the tuning frequency (Fb) of the box. For example, if the box is tuned high, say 40hz, it will start to behave like it's in free air as it drops below 40hz. This can cause mechanical damage if the sub's getting a lot of power.
So if your box is ported set the SSF at Fb. If you don't know FB set it in the mid-upper 30's.

Level(gain) is an adjustment to allow for varying signal strength of your HU.
The idea is to set the gain so that the amp reaches full output at the same time the HU reaches full volume (before clipping). If you have a high voltage (4-5v) head unit the level will be set toward the low side, maybe 25-50%. For a typical ~2v head unit it will probably need to be set higher (50-75%).
Those are just example percentages. There's no universal setting because amps' sensitivity ranges vary quite a bit - and some have high or low ranges.
Plus, HU's actual voltages can vary a bit from spec'd to actual.
The best thing to do would be look up a gain setting tutorial. The12volt.com has a good one.