Low Pass Filter

[fnzpntz 10+ year member]

What does everyone set there low pass filter to on there sub amp... I cant remember off hand what minds on...

Im just curisous

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[Prowler573 5,000+ posts]

I don't use the crossover in my sub amp.

I use the one in my HU and it is set @ 70Hz currently.

 

[fnzpntz 10+ year member]

Well im waiting on my h701 then ill crossover there... but until then i have to use the amp, thanks guys

 

[04blackgmc 10+ year member]

Yea on my amp its like 70-75 on Hu its 63.

 

[iamamp3pimp 5,000+ posts]

mine is set @ 63 i believe

 

[fnzpntz 10+ year member]

ok one more question with low pass at 63 whats your hi pass at 70? cus i was running mine at 125 so i wouldnt blow my mids... but i realize now i gues i wasnt playing any hz from 70-120 where do they go if u set the highpass and lowpass far apart from each other like that?

 

[Prowler573 5,000+ posts]

ok one more question with low pass at 63 whats your hi pass at 70? cus i was running mine at 125 so i wouldnt blow my mids... but i realize now i gues i wasnt playing any hz from 70-120 where do they go if u set the highpass and lowpass far apart from each other like that?

Crossovers are not a "brick wall" wherein every frequency outside of their setting is stopped dead in its tracks prior to the processed signal being sent to the drivers in question.

Let's take the LP filter for example:

If you set a LP filter @ 63Hz then all frequencies below that are attenuated down at whatever slope the crossover operates at. This doesn't mean everything above 63Hz is taken out of the signal path altogether but rather the....what's the word I'm looking for....we'll say 'volume' of those frequencies is reduced. The steeper the slope of the crossover is (12dB/octave is pretty standard, some crossover use an 18dB/octave slope, some use a 24dB/octave slope, and some have even steeper slopes in use) makes those frequencies being attenuated roll off even more dramatically.

In your example of the LP @ 63Hz and the HP @ 70Hz the frequencies in between 63Hz and 70Hz are going to be reproduced but at a lower volume than everything else.

 

[iamamp3pimp 5,000+ posts]

My HU Xover settings

Low LPF is set to 63 HZ with a 36DB/octave rolloff

mid HPF is set to 75 or 80 with a 12DB/octave rolloff

my MID LPF is set to 2.5k with a 28 DB/Octave rolloff

my High HPF is set to 4k with a 24DB/Octave rolloff.

right now, it sounds awesome, getting about 50 watts per channel.

 

[iamamp3pimp 5,000+ posts]

oh, my mids are out of phase with the rest of the system as well.