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## Re:Linkwitz transform 11 years 10 months ago #2535

 KAMIKAZE Visitor All attachments are lost in this theme ( Please Log in or Create an account to join the conversation. Last edit: by KAMIKAZE.

## Re:Linkwitz transform 11 years 10 months ago #2542

 knuisje Offline Senior Member Posts: 48 Thank you received: 4 I restored the attachments. The following user(s) said Thank You: KAMIKAZE Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 10 months ago #2659

 flocchini47 Offline New Member Posts: 4 Thank you received: 0 Help please I have calculated the following parameters per attached spreadsheet a0=1 a1=1.995203563661810 a2=-0.995211837027711 b0=1.002767239860590 b1=-1.995188529985050 b2=0.992459630843881 I inputted these for biquad1 .... biquad8 When I ask to process I get an error indicating values are missing Thanks in advance Bob Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 10 months ago #2668

 compay Offline New Member Posts: 6 Thank you received: 0 Add a comma to each coefficient except a2 and it should work. Albert Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 10 months ago #2669

 flocchini47 Offline New Member Posts: 4 Thank you received: 0 Albert I actually have biquad1, a0=1, a1=1.995203563661810, a2=-0.995211837027711, b0=1.002767239860590, b1=-1.995188529985050, b2=0.992459630843881, biquad2, a0=1, a1=1.995203563661810, a2=-0.995211837027711, b0=1.002767239860590, b1=-1.995188529985050, b2=0.992459630843881, to biquad8 ( I end without a comma. I do this in the output section Thanks Bob Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 10 months ago #2688

 flocchini47 Offline New Member Posts: 4 Thank you received: 0 Thanks I will do this. Do I paste at the input or the output? Sorry for being dense. Best Bob Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 10 months ago #2690

 flocchini47 Offline New Member Posts: 4 Thank you received: 0 Thanks for all the help = Up and running Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 6 months ago #3644

 CharlieLaub Offline Premium Member Posts: 113 Thank you received: 8 knuisje, Thanks so much for posting your spreadsheet (in post #1118 ) that can calculate the MiniDSP Z-transform transfer function coefficients. I had developed a very complicated crossover using the Laplace Domain transfer functions, but obviously could not enter those coefficients... I would have been stuck... so thanks again!!! One request, however, as you are missing two important filter functions: the FIRST order shelving high and low pass filters. Any chance that you could add these to the spreadsheet??? -Charlie Please Log in or Create an account to join the conversation. Last edit: by CharlieLaub.

## Re:Linkwitz transform 11 years 5 months ago #3655

 dreite Offline Platinum Member Posts: 1735 Thank you received: 765 Charlie, Those first-order filters can be programmed without using the advanced biquad capability. Just select a normal high/low-shelf and Q=1. Cheers, Dave. Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 5 months ago #3656

 CharlieLaub Offline Premium Member Posts: 113 Thank you received: 8 Dave, Thanks!!! I am still introducing myself to my MiniDSPs, so I was not aware I could do it that way... originally, I was planning on implementing everything via the biquad transfer function coefficient programming. So, I guess I would still like to know how to do it with the biquads... any ideas? -Charlie Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 5 months ago #3657

 dreite Offline Platinum Member Posts: 1735 Thank you received: 765 Charlie, Select the "Biquad Calculator" tab on your advanced plugin application and select PEQ, low(high)-shelf, Q=1, etc, etc, and hit the "calculate" button. It'll compute the required coefficients which you can then paste into the appropriate PEQ area of your plugin. (This is on page 16 of the 2x4 user manual.) Cheers, Dave. Please Log in or Create an account to join the conversation.

## Re:Linkwitz transform 11 years 5 months ago #3659

 CharlieLaub Offline Premium Member Posts: 113 Thank you received: 8 Hi Dave, Again, thanks! Also a good way to get the coefficients. But!!!! I am designing an Excel based active crossover modeler. I would like for it to display the transfer function coefficients, so I need to know how to calculate them, e.g. formulas, so that I can enter them in the spreadsheet. This is for DIY purposes only. I am planning to copy out all the other calcs from knuisje's spreadsheet, and so I am only missing these... -Charlie Please Log in or Create an account to join the conversation. Last edit: by devteam. Reason: Wrong button!
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