Audio crossover

blitter2 · May 24, 2011, 09:01 PM

From what I have understood a crossover uses a low and a high pass filter.

Second order crossover uses 12db filters and forth order 24db.

So what will occur if I use a crossover and won't connect L1 and L2 is that I will loose all frequencies bellow center among ones above center attenuated by a low pass filter.

Am I correct?

Russ · May 24, 2011, 10:15 PM

2-Way crossover's are typically made from a lowpass and highpass filter, but not always...
IIRC, kX crossover's use allpass filters.

Quote:

So what will occur if I use a crossover and won't connect L1 and L2 is that I will loose all frequencies bellow center among ones above center attenuated by a low pass filter.

I am not sure what you are asking there, but, think of it like 2 separate filters/plugins.
e.g.

Code:

|        | --> | lowpass  | -->
| signal |
|        | --> | highpass | -->

If you do not use the lowpass outputs, then all you have is a highpass filter.

blitter2 · May 24, 2011, 10:50 PM

Yes but if I don't wire L1 and L2 at kx DSP all bellow center won't be heared at all.

Because the signal bellow center along with its lowpass filter won't be redirected to any output.

That is what I want. Not to hear it at all.

Please correct me if I am wrong Russ.

Russ · May 24, 2011, 11:03 PM

Sort of, but not exactly, remember it is a slope not a brick wall.

i.e.
Can you hear a signal attenuated by 6 dB? 12 dB? 18 db? 24 dB? ,etc.

I think that would depend on what you have the volume set at, as well as what the original level of those frequencies was (or if something else is boosting those frequencies (e.g. some other EQ)), etc, right?

blitter2 · May 24, 2011, 11:20 PM

What I really mean is not to connect L1 and L2 to any of the outputs of my Live 5.1 .

Front, Rear or Center output.

Via kx dsp.

Where then the signal is going to output from?

Russ · May 24, 2011, 11:32 PM

Right, but you are still using the H1/H2 outputs, that look something like this:
H1/H2 outputs of 2nd order crossover @500Hz

Note that the signal does not just stop below 500Hz, it is attenuated more and more (on a slope) as you get farther away.

blitter2 · May 24, 2011, 11:46 PM

Btw I want center=35hz.

Any dedicated frequency splitter for kx project?

blitter2 · May 25, 2011, 12:11 AM

If I use EQP5 with several HighPass filters and create a slope "cut" at 35hz using EQP5's monitor, will the signal left of the slope (black area) be heared?

Russ · May 25, 2011, 12:27 AM

There is a frequency splitter plugin (under EQ & Filter), but it is not a brick wall either...

Quote:

If I use EQP5 with several HighPass filters and create a slope "cut" at 35hz using EQP5's monitor, will the signal left of the slope (black area) be heared?

Again, the signal is only attenuated (at a rate following the slope of the filter), it is not completely blocked. Whether you can hear it would depend on other factors. The steeper the slope, the less likely you are to hear it.

blitter2 · May 25, 2011, 12:43 AM

Thank you very much Russ

May 24, 2011, 09:01 PM	#1
blitter2 HardwareHeaven Lover Join Date: Sep 2008 Posts: 196 Rep Power: 26	Audio crossover From what I have understood a crossover uses a low and a high pass filter. Second order crossover uses 12db filters and forth order 24db. So what will occur if I use a crossover and won't connect L1 and L2 is that I will loose all frequencies bellow center among ones above center attenuated by a low pass filter. Am I correct? Last edited by blitter2; May 24, 2011 at 09:11 PM.

May 24, 2011, 10:50 PM	Thread Starter #3
blitter2 HardwareHeaven Lover Join Date: Sep 2008 Posts: 196 Rep Power: 26	Re: Audio crossover Yes but if I don't wire L1 and L2 at kx DSP all bellow center won't be heared at all. Because the signal bellow center along with its lowpass filter won't be redirected to any output. That is what I want. Not to hear it at all. Please correct me if I am wrong Russ. Last edited by blitter2; May 24, 2011 at 10:58 PM.

May 24, 2011, 11:03 PM	#4
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,563 Rep Power: 62	Re: Audio crossover Sort of, but not exactly, remember it is a slope not a brick wall. i.e. Can you hear a signal attenuated by 6 dB? 12 dB? 18 db? 24 dB? ,etc. I think that would depend on what you have the volume set at, as well as what the original level of those frequencies was (or if something else is boosting those frequencies (e.g. some other EQ)), etc, right? Last edited by Russ; May 24, 2011 at 11:14 PM.

May 24, 2011, 11:20 PM	Thread Starter #5
blitter2 HardwareHeaven Lover Join Date: Sep 2008 Posts: 196 Rep Power: 26	Re: Audio crossover What I really mean is not to connect L1 and L2 to any of the outputs of my Live 5.1 . Front, Rear or Center output. Via kx dsp. Where then the signal is going to output from?

May 24, 2011, 11:32 PM	#6
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,563 Rep Power: 62	Re: Audio crossover Right, but you are still using the H1/H2 outputs, that look something like this: H1/H2 outputs of 2nd order crossover @500Hz Note that the signal does not just stop below 500Hz, it is attenuated more and more (on a slope) as you get farther away. Last edited by Russ; May 24, 2011 at 11:38 PM.

May 24, 2011, 11:46 PM	Thread Starter #7
blitter2 HardwareHeaven Lover Join Date: Sep 2008 Posts: 196 Rep Power: 26	Re: Audio crossover Btw I want center=35hz. Any dedicated frequency splitter for kx project? Last edited by blitter2; May 24, 2011 at 11:52 PM.

May 25, 2011, 12:11 AM	Thread Starter #8
blitter2 HardwareHeaven Lover Join Date: Sep 2008 Posts: 196 Rep Power: 26	Re: Audio crossover If I use EQP5 with several HighPass filters and create a slope "cut" at 35hz using EQP5's monitor, will the signal left of the slope (black area) be heared? Last edited by blitter2; May 25, 2011 at 12:18 AM.

May 25, 2011, 12:43 AM	Thread Starter #10
blitter2 HardwareHeaven Lover Join Date: Sep 2008 Posts: 196 Rep Power: 26	Re: Audio crossover Thank you very much Russ