Active DSP: Please post your software and equipment

[ScottG]

REW has had that for longer than that (several years now).. but not real-time.

 

[rhthatcher]

DEQX / Earthworks measurement mic.

 

[manninen]

i love those gains

 

[rhthatcher]

I want to get a little more gain, so I'm in the process of building 5 channels of a fixed gain preamp using ZenMod's Iron Pre design. I have the boards for beta testing, plus the chassis and most of the other parts. Unfortunately the Cinemag autoformers are made to order, and I'll be waiting a while. I understand Cinemag is currently not manufacturing due to Corona Virus.



What's wrong with the kiss,boy ?

 

[andy2]

Based on fluid's suggestion, I downloaded VituixCAD and play around with the xover tab. Maybe I am not fully utilize its capability, but I found the "active filter" somewhat primitive to be useful. It's possible I haven't tried all of them.

 

[AllenB]

Yes, that was one of my concern with active DSP. Based on some of the feedbacks from those who have done it using miniDSP, every time you make any change in the FIR filter, you have to measure again.

I've experienced inaccuracy with some DSP. Moreso than analogue's usual tuning type concerns. Measuring each and every time is probably not necessary.

 

[fluid]

Based on fluid's suggestion, I downloaded VituixCAD and play around with the xover tab. Maybe I am not fully utilize its capability, but I found the "active filter" somewhat primitive to be useful. It's possible I haven't tried all of them.

This is the list of filter blocks available from the ViuixCAD help pdf

Filter block types
 Active Low pass and High pass filters (f). Shape and Order are selected from list boxes:
 1st order
 2nd order (Q)
 Linkwitz-Riley 12...48 dB/oct.
 Bessel 12...48 dB/oct.
 Butterworth 12...48 dB/oct.
 Chebyshev 0.5dB 12...48 dB/oct.
 1st order linear-phase
 2nd order linear-phase (Q)
 Linkwitz-Riley linear-phase 12...48 dB/oct.
 Bessel linear-phase 12...48 dB/oct.
 Butterworth linear-phase 12...48 dB/oct.
 Horbach-Keele linear-phase (R)
 Horbach-Keele “MTM” linear-phase (R)
 Brickwall linear-phase
 Active Shelving Low pass and High pass filters (f, gain). Shape is selected from list box:
 1st order
 2nd order (Q)
 1st order linear-phase
 2nd order linear-phase (Q)
 Active Linkwitz Transform (fo, Qo, fp, Qp)
 Active All-pass filters (f). Shape and Order are selected from list boxes:

 1st order
 2nd order (Q)
 1st order phase linearization
 2nd order phase linearization (Q)
 Linkwitz-Riley phase linearization 12...48 dB/oct.
 Bessel HP phase linearization 12...48 dB/oct.
 Butterworth HP phase linearization 12...48 dB/oct.
 Active Peak/Notch filters. Shape is selected from list box:
 Parametric EQ (f, Q, gain)
 Gain EQ (f, Q, gain)
 Phase EQ (f, Q, phase)
 Digital Biquad (b0, b1, b2, a0=1, a1, a2)
 Active Buffer / Power amplifier of active multi-way (gain dB, delay us, polarity inversion)
 Operational Amplifier (AOL, GBP)
 Transfer function file, any supported frequency response file type
 Passive R (Pow W)
 Passive C (ESR Ohm)
 Passive L (DCR Ohm, Wire diameter mm)
 Passive ideal Transformer (N=Vs/Vp).

Apart from Neville Thiel crossovers I don't see anything else missing, in what way is this primitive? It is not the sort of software that you will be an expert in in half an hour though.

 

[andy2]

This is the list of filter blocks available from the ViuixCAD help pdf

Filter block types
 Active Low pass and High pass filters (f). Shape and Order are selected from list boxes:
 1st order
 2nd order (Q)
 Linkwitz-Riley 12...48 dB/oct.
 Bessel 12...48 dB/oct.
 Butterworth 12...48 dB/oct.
 Chebyshev 0.5dB 12...48 dB/oct.
 1st order linear-phase
 2nd order linear-phase (Q)
 Linkwitz-Riley linear-phase 12...48 dB/oct.
 Bessel linear-phase 12...48 dB/oct.
 Butterworth linear-phase 12...48 dB/oct.
 Horbach-Keele linear-phase (R)
 Horbach-Keele “MTM” linear-phase (R)
 Brickwall linear-phase
 Active Shelving Low pass and High pass filters (f, gain). Shape is selected from list box:
 1st order
 2nd order (Q)
 1st order linear-phase
 2nd order linear-phase (Q)
 Active Linkwitz Transform (fo, Qo, fp, Qp)
 Active All-pass filters (f). Shape and Order are selected from list boxes:

 1st order
 2nd order (Q)
 1st order phase linearization
 2nd order phase linearization (Q)
 Linkwitz-Riley phase linearization 12...48 dB/oct.
 Bessel HP phase linearization 12...48 dB/oct.
 Butterworth HP phase linearization 12...48 dB/oct.
 Active Peak/Notch filters. Shape is selected from list box:
 Parametric EQ (f, Q, gain)
 Gain EQ (f, Q, gain)
 Phase EQ (f, Q, phase)
 Digital Biquad (b0, b1, b2, a0=1, a1, a2)
 Active Buffer / Power amplifier of active multi-way (gain dB, delay us, polarity inversion)
 Operational Amplifier (AOL, GBP)
 Transfer function file, any supported frequency response file type
 Passive R (Pow W)
 Passive C (ESR Ohm)
 Passive L (DCR Ohm, Wire diameter mm)
 Passive ideal Transformer (N=Vs/Vp).

Apart from Neville Thiel crossovers I don't see anything else missing, in what way is this primitive? It is not the sort of software that you will be an expert in in half an hour though.

That's why I was cautious saying that "maybe I have not tried them all". I've read that on the "Help" file too. But when I was using VituixCAD, the "DSP" block was very limited.

As you can see, the block options are somewhat limited.

 

[fluid]

What you are seeing there is filter types, low pass high, pass, biquad etc. Add one of those types in then change it to whatever slope and type from the above list you want.

I would advise putting a little bit more effort into actually using the program, before making negative comments like it being primitive or limited, you will then be rewarded with a state of the art simulation program that cost you nothing but your time and effort to learn 🙂

 

[andy2]

What you are seeing there is filter types, low pass high, pass, biquad etc. Add one of those types in then change it to whatever slope and type from the above list you want.

I would advise putting a little bit more effort into actually using the program, before making negative comments like it being primitive or limited, you will then be rewarded with a state of the art simulation program that cost you nothing but your time and effort to learn 🙂

I did try one of those block but it's very limited. I think you can only change the corner frequency and that's it.

As you can see, you can only change the corner freq. of a IIR block. Have you personally try it out yourself?

There is a "BiQuad" that you can change some parameters but that's about it. There's really nothing much more than that.

 

[ScottG]

YouTube

 

[ScottG]

If you want sort of a "head start" there is Xmachina:

Automatic crossover designing with XMachina

 

[fluid]

I did try one of those block but it's very limited. I think you can only change the corner frequency and that's it.

As you can see, you can only change the corner freq. of a IIR block. Have you personally try it out yourself?

There is a "BiQuad" that you can change some parameters but that's about it. There's really nothing much more than that.

Just press the shape menu box and voila!

 

[badman]

Here's my current setup: