x-over filters measured with Smaart7 @ the processor outputs

[Timo Beckman]

I made some screen recordings where i measure different x-over slopes and combinations @ the processor outputs.
Processor outputs were summed via a small mixer.

https://timobeckmangeluid.wordpress.com/2015/01/28/linkwitz-riley-2nd-order-high-and-low-pass-filter-combination-processor-outputs-summed-no-speaker-used/

https://timobeckmangeluid.wordpress.com/2015/01/28/linkwitz-riley-2nd-order-low-pass-summed-with-a-linkwitz-riley-4rt-order-high-pass-filter-1khz/

https://timobeckmangeluid.wordpress.com/2015/01/29/linkwitz-riley-8th-order-low-pass-filter-linkwitz-riley-4rt-order-high-pass-filter-1khz/

https://timobeckmangeluid.wordpress.com/2015/01/30/butterworth-3rd-order-low-pass-1khz-linkwitz-riley-4rt-order-high-pass-1khz-combination/

 

[Timo Beckman]

a "new" combination
https://timobeckmangeluid.wordpress.com/2015/12/20/assumption-is-the-mother-of-nm-2/

enjoy

 

[Timo Beckman]

Here's another one:

First LR4 HP LP @1kHz and then LIR HP LP filters summed after the processor outputs and then the same thing @125Hz.

Processor brand is a Linea Research ASC48

https://timobeckmangeluid.wordpress.com/2016/01/08/playing-around-with-a-new-toy-linea-research-asc48/

 

[Timo Beckman]

I did a couple more screen captures

Enjoy

https://timobeckmangeluid.wordpress.com/2016/10/12/cool-stuff/

https://timobeckmangeluid.wordpress.com/2016/10/11/playing-around-with-filters-and-stuff/

 

[Timo Beckman]

So here’s another screen capture. Upper part is the onax mic lower part is the ofax vertical mic. The ofax vertical is at the +/- -6db point of the horn.

https://timobeckmangeluid.wordpress.com/2016/10/17/cool-stuff-nm-2/

 

[Timo Beckman]

A short explanation on how i look at things when working on a drivers phase respons.
https://timobeckmangeluid.wordpress.com/2016/10/24/once-upon-a-time/
Enjoy

 

[Timo Beckman]

And my first steps on working with FIR:

https://timobeckmangeluid.wordpress.com/2016/11/13/a-little-update/

 

[Timo Beckman]

and another blog post on FIR:

https://timobeckmangeluid.wordpress.com/2016/11/29/going-extreme/

 

[newbieForever]

Here's another one:

First LR4 HP LP @1kHz and then LIR HP LP filters summed after the processor outputs and then the same thing @125Hz.

Processor brand is a Linea Research ASC48

https://timobeckmangeluid.wordpress.com/2016/01/08/playing-around-with-a-new-toy-linea-research-asc48/

Timo, thank for your examples.

I'm in search of a high quality digital crossover / eq unit to use at my home with my diy loudspeakers system.

• Can you please share your opinion on Line Research ASC-48?
• Is the LIR crossover implementation better sounding than a Linkwitz-Riley or other FIR crossover of the same order?
• Is optimized only for few angle or remain coherent through a wide spot?

Regards,
Roland

 

[Timo Beckman]

Timo, thank for your examples.

I'm in search of a high quality digital crossover / eq unit to use at my home with my diy loudspeakers system.

• Can you please share your opinion on Line Research ASC-48?
  
  It's a really nice unit but the x-over output is phase flat but most drivers are not so you still need to correct the phase from the driver itself especially in the x-over area (a high driver will show a phase angle downward before settling horizontally).
  
  
• Is the LIR crossover implementation better sounding than a Linkwitz-Riley or other FIR crossover of the same order?
  
  Our ears are not to sensitive to phase so a phase aligned system will sound ok what ever kind of x-over is used. That being said: i experience less listening fatigue working o phase flat systems.
  There are 2 more things noticeable on phase flat systems (for me and from hear speak from other technicians): the voice of the artist is more "in your face" and easier to get in to the mix.
  
  From a measurement point of view: on a phase flat system harmonics arrive at the same time as the fundamental where using a LR4 4th order high and lowpass x-over combination let's say at 125Hz causes harmonics on a 80Hz sine wave for example to lead compared to the fundamental since the group delay caused by that x-over combination delay's everything below that frequency.
  
  
• Is optimized only for few angle or remain coherent through a wide spot?

This is a question (?) because if it is i do not get it sorry i'm dutch so every now and then i get lost in translation

Regards,
Roland

 

[newbieForever]

Thanks Timo, forgive my poor english.

I hope that, being a speaker essentially a minimum phase device, I will be able to achieve the desired result by choosing the crossover points in the drivers' linear band (and where the frequency response covers a wide angle) and to fix the remaining response irregularities using the Linea Research parametric equalizer.

Finally i'll try to reformulate my last question:

Using LIR's crossover topology can i obtain a betters drivers integration (less destructive interference) over a wide listening area?

Regards,
Roland

 

[Timo Beckman]

You need to verify over a large area so onax-ofax horizontal and try to minimize the problems in the vertical plane.

If the driver used in your design is a coaxial one try to get a clean alignment on both planes onax-ofax horizontal-vertical.

With a 3 or 4 way design you'll run in to a multiple of the challenges described above.

 

[Timo Beckman]

A small post on the difference between Time alignment and Phase alignment. Enjoy ;-)

https://timobeckmangeluid.wordpress.com/2017/05/17/the-alignment-vs-phase-alignment/

By the way No subs used in this screen capture and the main system's phase respons (a Fulcrum Acoustic FA22ac) has been modified via 2 Allpass filters for the purpose of this screen capture......

 

[Timo Beckman]

So started working on this cool feature within the Powersoft Armonia software

https://timobeckmangeluid.wordpress.com/2017/05/20/working-again/

 

[Timo Beckman]

Finally got some work done today.....
Working On FIR Again. | Timo's World all around the globe

 

[Timo Beckman]

It's still a x-over so here you go:

Acoustic X-over | Timo's World all around the globe