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#### apilon

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Good afternoon

Am i understanding correctly that if i want to set a butterworth 4th order in minidsp then i need to set the slope to 24db/oct and 48db/oct would be considered buttrworth 6th order?

Reason i am asking is i was reading about setting hpf for a vented sub and the article mentionned that you should set the filter to 1/2 octave so since my sub port is tune to 23hz 1/2 octave is 17.25hz but at 2nd order butterworth the cone excursion goes way pass the xmax of 29 mm so i need to set it at a 4th order butterworth to get it under xmax value

Alain

#### Wayne A. Pflughaupt

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If you are asking if 48 dB/octave is a 6th order slope, the answer is no – 6th order would be 36 dB/octave. 48 dB/octave is 8th order.

Regards,
Wayne

#### apilon

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If you are asking if 48 dB/octave is a 6th order slope, the answer is no – 6th order would be 36 dB/octave. 48 dB/octave is 8th order.

Regards,
Wayne
Thanks so what would be 4th order then ?

12db is 2nd order right ?

Alain

#### JohnM

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Multiply the order by 6 to get the slope.

#### apilon

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Multiply the order by 6 to get the slope.
Thank for the explanation

so if in minidsp i set hpf to butterworth 48db/oct i just then set a 8th order butterworth if i understand correctly

#### AudiocRaver

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Thank for the explanation

so if in minidsp i set hpf to butterworth 48db/oct i just then set a 8th order butterworth if i understand correctly
Correct.

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