which is a true statement

[Etac 10+ year member]

say you set a 12db "high" pass filter at - 80 HZ

is it -6 DB at 80 Hz?

or does it start to drop at 80 HZ and becomes -12db at 40 (-6 at 60)?

Click to read more...

 

[Canaan 10+ year member]

say you set a 12db low pass filter at - 80 HZ
is it -6 DB at 80 Hz?

or does it start to drop at 80 HZ and becomes -12db at 40 (-6 at 60)?

If your LOW PASS crossover point is at 80hz...that is where it starts.

So, you will be -12dB down 1 octave ABOVE 80hz. So -12dB at 160hz.

 

[Etac 10+ year member]

err i said that backwards but you still answered my question

sorry its late lol

i meant high pass =)

thats what i thought but i read somewhere someone saying something else so just makin sure

 

[nauc 10+ year member]

for 12db "high" pass filter at - 80 HZ, it will be down 12dbs at 40hz

for low pass, it will be down 12dbs at 160hz

ps, 10dbs is considered sounding twice as loud

 

[Etac 10+ year member]

yea i know it sounds like a noob question

i edited my post before -

and i read someone saying that they kinda meet in the middle (depending on slope)

example: if you set the filters at 80 on both your speakers and subs - they'll both be -X (depending on slope... 6 would be 3.... 12 would be 6 ect...) dbs at 80 so their roll offs combine for a "flatter" response snd dont spike at the 100-60ish range (unless that what you want) /shrug

i could prolly werd that better but hopfully youll get what i mean

 

[spoonraker 10+ year member]

http://www.bcae1.com/

 

[Immacomputer 10+ year member]

say you set a 12db "high" pass filter at - 80 HZ
is it -6 DB at 80 Hz?

or does it start to drop at 80 HZ and becomes -12db at 40 (-6 at 60)?

No, it will be -3dB at 80hz and then proceed to drop by 12dB an octave from there.

For any crossover of any order, the crossover point(s) will ALWAYS be 3dB down. This is known as the half power point and cutoff frequency.

 

[squeak9798 5,000+ posts]

For any crossover of any order, the crossover point(s) will ALWAYS be 3dB down.

For a Butterworth filter, that is correct. Any order of crossover will attenuate the signal by -3db at the crossover frequency.

Linkwitz-Riley filters, however, are -6db down at the crossover frequency.

 

[jblayz1 10+ year member]

yea i know it sounds like a noob question
i edited my post before -

and i read someone saying that they kinda meet in the middle (depending on slope)

example: if you set the filters at 80 on both your speakers and subs - they'll both be -X (depending on slope... 6 would be 3.... 12 would be 6 ect...) dbs at 80 so their roll offs combine for a "flatter" response snd dont spike at the 100-60ish range (unless that what you want) /shrug

i could prolly werd that better but hopfully youll get what i mean

your posts are very confusing.

 

[Immacomputer 10+ year member]

For a Butterworth filter, that is correct. Any order of crossover will attenuate the signal by -3db at the crossover frequency.
Linkwitz-Riley filters, however, are -6db down at the crossover frequency.

Thank you for the correction.