butterworth 4th order setup in minidsp - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 6 Old 05-14-15, 03:18 PM Thread Starter
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butterworth 4th order setup in minidsp

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


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post #2 of 6 Old 05-14-15, 04:46 PM
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Re: butterworth 4th order setup in minidsp

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.

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Wayne



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post #3 of 6 Old 05-14-15, 04:51 PM Thread Starter
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Re: butterworth 4th order setup in minidsp

Quote:
Wayne A. Pflughaupt wrote: View Post
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 ?

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post #4 of 6 Old 05-15-15, 02:55 PM
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Re: butterworth 4th order setup in minidsp

Multiply the order by 6 to get the slope.
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post #5 of 6 Old 05-15-15, 11:19 PM Thread Starter
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Re: butterworth 4th order setup in minidsp

Quote:
JohnM wrote: View Post
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
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post #6 of 6 Old 05-20-15, 04:56 AM
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Re: butterworth 4th order setup in minidsp

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apilon wrote: View Post
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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