New Head Unit has a crossover setting that I don't understand?? db?

[eb2phkingood 10+ year member]

ok, i get the typically hpf of say 120hz. but my new hu kdc-x794 not only says 120hz but then below it i can choose from -3db, -6, -12, -18. is this just all personal taste?

standard starting points for lpf on a sub amp are generally about 80hz, while hpf on a speaker amp is usually 100hz sometimes 120hz.

what are the standard starting points for the db on a hpf and lpf?

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[SpeedEuphoria 10+ year member]

Hey nice Head Unit, just installed one myself and its nice

crossovers have slopes, basically a crossover is not all or nothing. Normal slopes are -6db, -12db and some use -24db. Basically at the point you select, let say 80HZ for a LPF on the sub. So at 80hz if you set -18db it would be pretty quiet(less content allowed) above 80hz. Now if you used -3db you would still have a lot comming through at 100hz.

Basically most use this to "blend" a sub in with the front statge. You can try running a higher LPF with a sharper cutoff(like -18db, so 80hz) or some find it better using a lower cutoff with a lesser slope(like 50hz, -6db). I suggest playing with the 2 setting mentioned here and see which you like best

Normally -12dp is standard 1st step for passive x-overs for component sets, but its all in design and how things sound/blend.

Its more technical than that, but -6db is 1st order, -12 is 2nd order, ect..(every 6db)

 

[whitedragon551 5,000+ posts]

Slopes are all personal taste. Look for number 27 on the right hand side for a little more info.

Basic Car Audio Electronics

I run my subs at a 63Hz crossover and a 18db slope.