If you have a digital mixer, you may be wondering, what is the best use of a matrix?
An audio matrix should be used anytime you need to create a slight variation of your
main mix.
The perfect example of this is setting a crossover for your mains and subs.
And in this video, I’m going to show you how to get it all set up using the X32.
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An audio crossover is basically an EQ filter that enables you to split up an audio signal
into two or more frequency ranges.
In other words, with a crossover in place, you can send only the low frequencies to your
subs and everything else to your mains.
Modern powered speakers and amps will often have built-in crossovers.
For example, on the JBL SRX828, you can use the little display on the back to program
a crossover at 60Hz, 80Hz, 100Hz or even connect it to your network to select a custom crossover
setting.
If your speakers don’t have this capability, or you simply want to program it all from
your mixer, using matrix mixes is a great solution.
So, let me show you how to set it up on the X32.
If you’re using a different digital mixer that supports matrix mixes, this should also
translate to your mixer.
Step 1: Assign three matrix mixes to the correct outputs.
You need three matrix mixes because you have Main Left, Main Right and your Subs.
On the X32, navigate to the routing screen and select the out 1-16 tab.
Find the output you are currently using for Main Left, most likely Output 15.
Set the ‘Output Signal’ to Matrix 1.
Then, find the output you are using for Main Right, most likely Output 16.
Set the ‘Output Signal to Matrix 2.
Finally, find the output you are using for your sub and assign the ‘Output Signal’
to Matrix 3.
Keep in mind, if you are currently using the same output as your mains for the sub, you
will need to use an open output and connect your sub accordingly.
Step 2: Link Matrix 1 & 2
Since they will be used for Main Left and Main Right, Matrix 1 & 2 need to be linked
as a stereo pair.
To do this, select Matrix 1, navigate to the HOME screen and push in the knob labeled ‘Link’.
Step 3: Route the main mix to the matrix mixes.
To do this, navigate to the HOME screen.
Press the ‘SELECT’ button above the MAIN mix fader.
Navigate to the ‘sends’ tab and bring the level up for 1, 2 & 3 to 0dB.
Step 4: Bring the matrix faders up to 0dB.
To do this, press the ‘MATRIX 1-6’ button and bring up the faders for Matrix 1, 2 & 3
to 0dB.
Also, you will want to make sure all three are not muted.
Step 5: Apply a low cut filter to Matrix 1 & 2.
Matrix 1 & 2 are for the main speakers, so you’ll need to cut out the frequencies that
go to the subwoofers.
To do this, select Matrix 1 and navigate to the EQ screen.
Activate EQ by pushing the button labeled ‘Equalizer’.
Select your ‘Low’ EQ filter and change the mode to ‘Low Cut’.
Set the frequency to 100Hz, or wherever it makes sense for your system.
Step 6: Apply a high cut filter to Matrix 3.
Matrix 3 is for the subs, so you’ll need to cut out the frequencies that go to your
mains.
To do this, select Matrix 3 and navigate to the EQ screen.
Activate EQ by pushing the button labeled ‘Equalizer’.
Select the ‘High’ EQ filter and change the mode to ‘High Cut’.
Set the frequency to 100Hz, or wherever it makes sense for your system.
Keep in mind, 100Hz may or may not be the right frequency placement for your speakers.
But, it will most likely be somewhere between 80-120Hz.
If you can’t find crossover documentation for your speakers, experiment between the
80-120Hz range to find what sounds best.
Well, you did it.
And believe it or not, there are several other good uses for matrix mixes and I have video
all about it.
I’ll include a link in the description.
If you have questions, drop them in the comments.
I’d be glad to answer.
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See ya next time.