How to set hpf and lpf on sa sfb 1000?

[MyNameIsHere]

I can't figure out how to set the crossover on the amp.

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[Popwarhomie 5,000+ posts]

Both all the way to the left. Counter clockwise.

 

[MyNameIsHere]

Both all the way to the left. Counter clockwise.

Right now they are all the way to the left. I just have to set gain.

The hpf isnt supposed to be all the way to the right?

 

[Popwarhomie 5,000+ posts]

Right now they are all the way to the left. I just have to set gain.

The hpf isnt supposed to be all the way to the right?

No the HPF works as a subsonic filter. I forgot you don't have an aftermarket headunit so you will want to set the HPF depending on your box tuning.

say you are tuned to 45 Hz:
- 45 Hz / 2 = 22.5 Hz (one octave lower)
- 22.5 Hz /2 = 11.25 Hz (half an octave lower)
So we take 45 - 11.25 = 33.75 Hz (rounded up to 34 Hz)
In other words, you set your sub-sonic to 34 hz. So that way, if there's music below the ports frequency, it gets filtered out protecting your woofer.
Always remember the subsonic filter is NOT a cut-off. It has a roll off "slope" where whatever frequency its set to will be attenuated, and the attenuation effect increases as the frequencies get lower. Thus the power to the woofer decreases at filtered frequencies, which reduces the excursion and risk of damage.

 

[Firewalker]

I thought on those SFB and SIA the LPF was the subsonic? At least that is what I was always told. Will have to send Apex a email and ask.

 

[MyNameIsHere]

No the HPF works as a subsonic filter. I forgot you don't have an aftermarket headunit so you will want to set the HPF depending on your box tuning.

say you are tuned to 45 Hz:
- 45 Hz / 2 = 22.5 Hz (one octave lower)
- 22.5 Hz /2 = 11.25 Hz (half an octave lower)
So we take 45 - 11.25 = 33.75 Hz (rounded up to 34 Hz)
In other words, you set your sub-sonic to 34 hz. So that way, if there's music below the ports frequency, it gets filtered out protecting your woofer.
Always remember the subsonic filter is NOT a cut-off. It has a roll off "slope" where whatever frequency its set to will be attenuated, and the attenuation effect increases as the frequencies get lower. Thus the power to the woofer decreases at filtered frequencies, which reduces the excursion and risk of damage.

My subs are sealed

 

[Popwarhomie 5,000+ posts]

My subs are sealed

Then all the way left.

 

[MyNameIsHere]

Then all the way left.

Ok, what about the lpf? Or is it the hpf that needs to be set now?

 

[Popwarhomie 5,000+ posts]

Ok, what about the lpf? Or is it the hpf that needs to be set now?

Both will be all the way left. 15hz-80hz. Only thing you need to move is the gain.

 

[MyNameIsHere]

Both will be all the way left. 15hz-80hz. Only thing you need to move is the gain.

Alr. I think I got it set now. Thanks.