[HenacanPodwell]

I use the first calculator located below for crossovers. I plug in values until the crossover point is found....whether it is LP or HP depends on the configuration. For 500HZ I came up with 17.7Ohms and an 18UF cap. Then you may have to adjust if there is not a readily available value, or use resistors/cap in parallel or series to get the desired point. Regarding Zobels and padding, I use the second one, though there is lots of discussion as to which value for the impedance to use, as BA's impudence changes in relation to the frequency being applied. I usually put in an average of the datasheet values and guesstimate as to the DB drop I'm looking for. I take it you have a test rig, as it is still a lot of trial and error?

http://www.sengpielaudio.com/calculator-RCpad.htm

http://www.sengpielaudio.com/calculator-Lpad.htm

Hello! I see! Does that means the low pass and high pass filter should works the same for all of the drivers? I always thought that you need resistance value for the driver to make low pass filter specifically for that particular driver and the same low pass filter will cut differently on other driver. And yes I do have test rig. By the way how do I calculate or make sure that the phase is correct? Do I just do trials and errors until there is no weird dip and peak in the frequency graph? As I have heard that adding low or high pass filter will introduce phase shift.
Thank you!

 

[HenacanPodwell]

Two ways.

One is experimentation with just a single cap on the ED and a combination of a resistor(really doesn't act as a LP filter though) and dampers on the CI.

The other, which is slightly more complicated, involves building an RC filter for each pass. The good news is that the values of the components are the same. You start by figuring out how much attenuation (if any) is needed on your (hopefully) low freq driver, and build that into the RC filter.

Hello, what does adding single cap to ED actually do? I see that it cut off most of the low and mid frequency, why does that happens? Since it is not really a high pass filter right? Or am I understanding it wrongly.

 

[Bassiklee]

A single cap forms a 6dB/octave HPF. As far as how/why it works, google is your friend.

 

[HenacanPodwell]

A single cap forms a 6dB/octave HPF. As far as how/why it works, google is your friend.

I see! Thank you! Does low pass and high pass filter does anything to the driver besides cutting the frequency and causing phase shift?

 

[Bassiklee]

I'm not sure I follow your question.

 

[HenacanPodwell]

I'm not sure I follow your question.

I am sorry for the confusing question. Let me try to explain it. I found out that adding a single caps to ed29689 actually changes the frequency by introduce a new peak around the treble region thus changing the overall frequency while cutting low to mid frequency. Does low/ high pass filter does anything similar like introduce a new treble peak or it is only like erasing a part of the frequency(over simplified i know).

 

[Farquarl]

I am sorry for the confusing question. Let me try to explain it. I found out that adding a single caps to ed29689 actually changes the frequency by introduce a new peak around the treble region thus changing the overall frequency while cutting low to mid frequency. Does low/ high pass filter does anything similar like introduce a new treble peak or it is only like erasing a part of the frequency(over simplified i know).

Are you just hooking up this one driver? Generally a HPF or LPF does not introduce new peaks but it can definitely happen. A Zobel Network can sometimes be used to tame a weird crossover behaviour.

 

[HenacanPodwell]

Are you just hooking up this one driver? Generally a HPF or LPF does not introduce new peaks but it can definitely happen. A Zobel Network can sometimes be used to tame a weird crossover behaviour.

Yup, I was only testing up ed29689. I see! Thank you very much! You really helped me clear up my confusion a lot!

 

[Farquarl]

Can someone tell me how JH Audio measures the phase/time aligment? What software do they use and how do they wire up the drivers? I can´t wrap my head around it, in order to measure phase you would need to drive each driver individually right? But you also need to go through the propper crossover channels.
It would be really cool to be able to measure phase alignment.

 

[GeneBush]

Can someone tell me how JH Audio measures the phase/time aligment? What software do they use and how do they wire up the drivers? I can´t wrap my head around it, in order to measure phase you would need to drive each driver individually right? But you also need to go through the propper crossover channels.
It would be really cool to be able to measure phase alignment.

They use Smaart for measurements and they measure all drivers together how they react with one another regarding phase.

 

[Farquarl]

They use Smaart for measurements and they measure all drivers together how they react with one another regarding phase.

Thanks!
Smaart is pretty expensive for a hobbyist . I´ll look into this topic a bit more there must be a way which is cheaper.

 

[gregeagle]

Some of my latest builds....
BS6Z and MASM6!!!

 

[Farquarl]

Some of my latest builds....
BS6Z and MASM6!!!

Dope! That is some damn fine work.

 

[mattmatt]

Some of my latest builds....
BS6Z and MASM6!!!

Dope!! What did you use for coloring your resin? This look great! I still have a hard time with proper black pigments.

 

[gregeagle]

Dope!! What did you use for coloring your resin? This look great! I still have a hard time with proper black pigments.

I am using the black Fotoplast vom dreve!! Make slightly thicker shells!