Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC:

C-DSP 8x12 V2 using "Allpass" 2 years 4 months ago #43783

  • rsqt
  • rsqt's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 12
  • Thank you received: 0
Hello,

does anyone know where I can find something to use the Allpass function correctly?
I know it can "correct" the phase that changed using a filter. Setting filters for subs of more than 4th order oder so changes the phase a lot.

Perhaps someone is so kind to explain it using this example or knows where to find a tutorial.

Sub: LP 60 Hz/LR48
Low Mid: HP 60Hz/LR24 -LP 2,5KHz/LR12
High: HP 2,5kHz/LR12

Thanks for your help.

Ralf

Please Log in or Create an account to join the conversation.

C-DSP 8x12 V2 using "Allpass" 2 years 4 months ago #44003

  • devteam
  • devteam's Avatar
  • Away
  • Administrator
  • Administrator
  • Posts: 9021
  • Thank you received: 1338
@Ralf

Typically, that kind of filter, if you don't have prior experience is to be used iteratively around the crossover point and remeasure, change, remeasure.. If you do symetrical slopes it's a LOT easier typically... Just a thought.

Devteam
miniDSP, building a DSP community one board at a time.

Please Log in or Create an account to join the conversation.

C-DSP 8x12 V2 using "Allpass" 3 months 1 week ago #57270

  • denver8me4dinner
  • denver8me4dinner's Avatar
  • Offline
  • Elite Member
  • Elite Member
  • 3038564518
  • Posts: 285
  • Thank you received: 58
It requires a cascade of all pass filters to approximate a linear pass band. 

adding a allpass to a crossover will just further increase your phase shift even more. 

You need an fir filter to do this task. 
maybe check out using a 2x4hd for your sub.

does your 8x12 have DL?  If so DL should take care of the sums for you.


cheers 

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
Moderators: devteam