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Bandpass via Biquads 12 years 3 months ago #1558

coctostan
Topic Author
Offline
New Member
Posts: 2
Thank you received: 0

I just received my Minidsp and I'm trying implement a bandpass filter with the biquad functionality so a subwoofer can have both a lowpass and a subsonic highpass. I'm able to implement either the low pass or high pass alone without an issue. When I try to combine the two by placing the lowpass in Biquad1/2 and the highpass in biqaud3/4 it gives me an error ("Your biquad input is not formatted correctly").

Is this functionality not possible or am I doing something incorrectly? I think functionality should be included as it is imperative to using the MiniDSP as a crossover in 2-way and 3-way systems.

biquad1,
b0=0.000167290240522,
b1=0.000334580481044,
b2=0.000167290240522,
a1=1.952087574597440,
a2=-0.952756735559526,
biquad2,
b0=0.000169642579007,
b1=0.000339285158014,
b2=0.000169642579007,
a1=1.979536699623030,
a2=-0.980215269939063,
biquad3,
b0=0.998549736557173,
b1=-1.997099473114350,
b2=0.998549736557173,
a1=1.997098241202480,
a2=-0.997100705026211,
biquad4,
b0=0.999400202416502
b1=-1.998800404833000
b2=0.999400202416502
a1=1.998799171871920,
a2=-0.998801637794090,
biquad5,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad6,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad7,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad8,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0

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Re:Bandpass via Biquads 12 years 3 months ago #1559

knuisje Offline Senior Member Posts: 48 Thank you received: 4	You're missing a few commas in biquad 4.
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Re:Bandpass via Biquads 12 years 3 months ago #1560

coctostan Topic Author Offline New Member Posts: 2 Thank you received: 0	I thought I had corrected those. I apologize. Please disregard. Thanks
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Re:Bandpass via Biquads 12 years 2 months ago #1648

sladi Offline Senior Member Posts: 78 Thank you received: 8	Hi, I'M pretty new to this and I don't want to open a new thread since my question seems related: Do the Biquad filters allow me to use the advanced 4-way plugin to have another highpass for one channel? I may need one for a 4-way speaker with a subwoofer. If yes, can I still equalize the same subwoofer channel otherwise too?
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Re:Bandpass via Biquads 12 years 2 months ago #1653

devteam
Offline
Administrator
Posts: 9145
Thank you received: 1456

Lom,

Each output already has a bandpass filter (Low pass + High pass) so typically, there is no need for using biquad filters to build a 4way system.

Biquad filter programming is detailed in the Applications section of the website. Please have a look at it first. You'll realize that filtering (i.e. LPF/HPF) and equalization (i.e. Parametric EQ) are in 2 different sections of the designs. In other words, yes, you could use biquad programming AND equalize.

Hope this info helps.

DevTeam

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

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Re:Bandpass via Biquads 12 years 2 months ago #1655

sladi Offline Senior Member Posts: 78 Thank you received: 8	Thanks, actually I need another highpass for the subwoofer channel to protect the speaker from high excursion. As far as I can see from the pictures, the plugin only provides a lowpass for the channel (the tweeter has no lowpass either for example). So I'm very pleased that if I really do a 4-way, I have the possibility to add a subsonic filter.
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Re:Bandpass via Biquads 12 years 2 months ago #1658

devteam Offline Administrator Posts: 9145 Thank you received: 1456	Lom, It's just that in the picture we didn't enable the HPF and LPF for the first and last channels (bypassed). Please see the plug-in datasheet. It's showing clearly that EVERY output channel has LPF AND HPF. Hope this clarifies. miniDSP, building a DSP community one board at a time.
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Re:Bandpass via Biquads 12 years 2 months ago #1659

sladi Offline Senior Member Posts: 78 Thank you received: 8	Thank you for your information! I didn't look carefully enough - I was used to the fact that conventional crossovers do not provide this.
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Re:Bandpass via Biquads