subwoofer filter

[Mdkanz]

would this be an acceptable filter for a subwoofer?

 

[MikeMl]

I don't think it is flat enough below the cutoff of ~100Hz. Look at how this guy did it.

 

[Mdkanz]

Ok i found a better filter but it says that i have to use a 9.95 and a 3.18 Mhy coil and from this calc "Coil Calculator", " Number of turns required", Crystal or Ham Radio Design Calculators with 30 awg wire it looks like 4000+ turns is there an easier way to make a coil?

 

[MikeMl]

mH coils are too unwieldly to wind as air core coils. Look at DigiKey and see what you can buy as an ready made "inductor". Frankly, I think you are on the wrong track. Filters like this are usually inserted ahead of the power amplifier which drives the speaker. That way, you can use "active filters" like in the link I gave you.

 

[Hayato]

You need to use a core. That site's calculator fits for air-core inductors. And do not use a 30 AWG wire for a subwoofer, the inductor will have too much parasitic resistance.

 

[audioguru]

A subwoofer lowpass filter is usually active and feeds the sub-woofer's amplifier. Inductors are not used.
Usually a second order or third order filter is used, not your gradual and droopy first order filter.

 

[crutschow]

Ok i found a better filter but it says that i have to use a 9.95 and a 3.18 Mhy coil and from this calc "Coil Calculator", " Number of turns required", Crystal or Ham Radio Design Calculators with 30 awg wire it looks like 4000+ turns is there an easier way to make a coil?

Yes, buy one.

If you insist on a passive crossover for your subwoofer you could use one of**broken link removed**iron core inductors as part of it.