How to guide: Setting the delay between the left and right speakers.

[completeluxury]

Ok guys, so ive finally gotten this to a point and played around with enough programs that i think this will now be straight forward and easy enough for everyone.

This method gets your speakers PERFECT if you give it even 20 minutes.

I wrote a guide yesterday, but today i logged onto my configurator and went huh.. why the hell do i have a 2000us delay in my slave amplifier i dont remember setting that.. so im going to start my guide from scratch with both delays starting at 0us.

You are going to need 2 programs - Audacity (free program) and adobe audition (30 day trial is available) and 1 audio file

You can download the audio file that you will need for this guide here https://www.dropbox.com/s/ddvs7yrhqef56c...t.wav?dl=0

warning - PLEASE TAKE NOTE - warning - when you open the speaker settings in the configurator, there is a crossover/delay section for if the pre-out is enabled and if the pre-out is disabled. For all of us with pre-outs feedings subs - every time that you load this section up it will always open in the pre-out DISABLED section. you will change your settings, put the sd card back in your devialet and go why the heck didnt the settings change.. i did it so many times its not funny.

for reference - i set the delays for both the pre-out enabled and disabled.

First step - open audacity.

go to file - open then go to the dirac pulse file that you downloaded from this thread.



once you do that it will load the audio file. here you can see the dirac pulses i was talking about



So the top box is the left channel and the bottom is the right.

From here - open audition.

Once you are in, towards the bottom right there is transport controls. click on the record button and it will bring up some options. record at 192khz. it will start recording so just press stop.

Once you are ready, press the record button then quickly alt-tab to audacity and press the play button. once the clicks have both played alt-tab back to audition and press the stop button. You are going to look at the recorded section and think to yourself - why is it still blank - dont worry it recorded.

Where the transport controls are there are some magnifying glass icons. press the plus on the left until you can see the two pulses, then with your mouse click on the screen in between them so that you see the red marker line. after that press the magnefying glass on the right a few times. play around with your zooms and eventually you will see this:



First you should zoom in on the first pulse. You will get to this:

There is a few things here you need to pay attention to.The size and shape of the waveform. Also note after the initial peak how much further down the pulse goes past where it started in the negative region. its about 2 rectangles exactly. And even though this is a positive peak, it has a small negative dip before the positive peak.



From here, unzoom on the first pulse and zoom right in on the second pulse and it will look like this:



You can now see the second set of pulses.

The second pulse combines the negative and a positive pulse. If the negative pulse happened at the same time as the positive - they cancel each other out.

if the negative pulse happened at the same time as the negative "dip" after the positive peak in the first pulse it would strengthen the pulse and extend much further.

it did neither of those things so i know that the second negative dip is actually the negative pulse. it is smaller than the first positive pulse because it is being cancelled out by part of the positive pulse which you can see in the first photo.

Furthermore, this second pulse has retained the original shape of the first pulse - meaning it has a small dip, then a peak, then a dip, which means that the left channel definitely lags the right channel. if you take the measurement and the waveform is reversed so it has a small positive peak, then a big negative then another positive then the right channel is the speaker that is delayed naturally.

so you need to find the time difference between the positive pulse and the negative pulse.

You can see the peak of my positive pulse is about 3.971660 and the peak of the second negative pulse is about 3.971760. That equates to 100us delay that i need to add to the LEFT channel.

So i pull out the devialet card for my left amp, input a 100us delay on the sub pre-out, speaker pre-out enabled and pre-out disabled.

pop the card back in and one more time record the pulse from audacity. Here you can see how good your delay is. Here is the photo after changing the delay:



Notice how the second pulse is about 1/3 the size of the first - that is because the negative and positive pulses are cancelling each other out! this is how you know your speakers are getting better.

However theres one important thing to take note of here. Instead of a small negative dip before a bigger positive peak i now have a small positive peak followed by a bigger negative peak! this means the delay i have set is a touch too long.

From here i pulled the slave card out and changed the delay from 100us to 90us and the next photo is the result



i got a little perfectionist after this point but i was a little let down the configurator only lets you adjust the delay in increments of 5us.

So if i set the delay to 85us it was the left channel a little bit behind, set to 90 is the right channel thats a bit behind... i was trying to set the figure to 86, 87, 88 etc but it reverts to either 85 or 90 as soon as you click ok.

So thats it. im sorry about yesterdays screw up but honestly i dont expect much less from myself.

If any one has any questions feel free to ask and ill try help as much as i can.