Room correction - How to start?

[mitchco]

Yes, if using a USB mic with Audiolense, make sure in the measurement window, Advanced Settings menu that "Use Clock Drift Correction" is enabled. This will compensate for two different clocks and works extremely well. I have a post on the Audiolense forum that compares this to an analog mic and the difference was 0.02ms worst case.

 

If you are using a USB mic like the UMIK-1, and an ASIO capable DAC, then you need to download and install:

https://www.asio4all.org/ Make sure you have installed it with "offline" settings checked on. Then open it up and ensure only the UMIK-1 input "blue pin" is enabled and then the DAC playback output blue pin is enabled. Then make sure all other pins are disabled. In Audiolense, for playback and input devices, just select ASIO4ALL in each dropdown and that should map the the settings made earlier. One can verify be checking speaker connections. If still no sound, then in the Advanced Settings menu, select "use separate play and record streams:" and all shall be well :-)

 

Kind regards,

Mitch

[mitchco]

@eternaloptimistI don't disagree one bit. I spend the majority of my time troubleshooting measurement setups and as the song goes, nobody knows the trouble I have seen :) 

 

You are talking about systems design and this is what I did with my miniPC DSP offering. Everything is already configured, turn it on, take measurements, use my service or design/generate your own filters, install and enjoy! Guaranteed to work out of the box. No fuss, no muss.

 

The issue is very few people are starting from scratch. They already have a computer or a converter or a measurement mic or any combination thereof. Then it is no longer a system design and what can go wrong will go wrong as there are so many variables to account for. This is the fundamental issue. I have detailed step by step instructions and how to guides in addition to what I have written in articles on AS, complete with screen shots, etc., and even then there are troubles. So many, that I could write pages of the issues folks (and I) have run into. 

 

While it is getting better, taking acoustic measurements, analysing the results, designing a custom FIR or DRC filter for ones speakers/room and installing it in whatever convolver is complex task with many variables and makes the big assumption that one knows what they are doing. I certainly sympathize and am actively working on trying to reduce the complexity.

 

Hope you are enjoying the music!

[mitchco]

@eternaloptimist in the software world, Dirac is a completely closed source solution... Glad you are enjoying the music!

 

@ecwlDirac has no user controls other than target curve. Thus it is a general purpose solution.

 

Both Acourate and Audiolense XO have full user control over frequency dependent windowing. Both low and high frequency window widths can be independently adjusted for both magnitude and excess phase correction, along with the amount of amplitude correction applied.

 

The physics is understanding frequency dependant windowing (FDW) and how that applies to ones speakers and room. There are a number of math calculations to make relative to how much amplitude and excess phase windowing is applied for any given speaker in any given room. Usually at low frequencies one wants quite a long window to take care of room modes/reflections and then above the rooms transition frequency, a lot less excess phase correction, but still some direct sound correction if the speaker is not the smoothest.

 

As pointed out in this article, there is an "ideal response" or textbook response one wants to shoot for the most accurate sound. Of course ones ears count :-)