Article: What is Accurate Sound?

[mitchco]

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[The Computer Audiophile]

I love it @mitchco. Thanks for the education :~)

[Matias]

Master class featuring Mitch Barnett. 👏

[Mordikai]

Mitch- this is fantastic! I've got to get serious and give you a call.

[jrobbins50]

I am a believer. Nice article, Mitch. JCR 

[Axial]

WoW! 

[mitchco]

2 hours ago, jrobbins50 said:

I am a believer. Nice article, Mitch. JCR 

Thanks Jeffrey!

[blue2]

Excellent article! Could you provide some more details about how you achieved these results? It appears the filters were measured and applied via Audiolense? What hardware was used for DSP playback? I appreciate a full answer would be another full length article so brief details of the hardware, software and measurements would be fantastic.

Thanks

[Bob Stern]

Mitch, do you know what smoothing is used in the frequency response graphs?  I don’t see that stated in the Audiolense user guide.  Is it a proprietary psycho-acoustic smoothing?

[danadam]

Quote

Group delay should be flat and again following the low frequency roll off:

The link doesn't work (404 Not Found)

 

Quote

Here I have chosen the song “Spanish Harlem” from Rebecca Pidgeon’s The Raven,

Correct link: https://www.hdtracks.com/#/album/5bffcf17c6e102670ab3fbc6

[R1200CL]

Can the Audiolence DSP be applied to Roon or HQPlayer ?

Are there processor power requirements.

 

The reason for asking is I don’t want an extra PC in the digital chain. 
(I understand I need a PC for measurements). 

[firedog]

1 hour ago, R1200CL said:

Can the Audiolence DSP be applied to Roon or HQPlayer ?

Are there processor power requirements.D

 

The reason for asking is I don’t want an extra PC in the digital chain. 
(I understand I need a PC for measurements). 

You create the convolution filters with Audiolense and then place them somewhere on your network. Generally it's your server or whatever your "processing" PC is. In the DSP section of Roon or the convolution section of HQP, you write the path of the convolution files you created. The given playback program then applies the DRC during playback. Same for many other "audiophile" playback software programs.

 

No "extra" computer needed. 

 

Convolution by itself doesn't need extreme amounts of computing power. On my moderately  powerful  server (in today's terms), convolution barely budges the CPU load. But if you are doing additional DSP and heavy upsampling (such as in HQP) along with the convolution, you are going to need some serious computing power.

 

For the measurements and creation of the convolution files, I use my laptop - it's simply the most convenient for me. I think that's pretty common. You simply need a PC that you can physically connect to the measurement mic and  that's also connected to your system  for the playback of the measurement signal. Once you've created the convolution files, you don't need that computer again at all, unless you make changes and need to remeasure, etc. 

 

[Quad 405]

I'd like to give a shout out for Mitch's Accurate Sound Calibration service and his book.  My Kii Threes are sounding even better after Mitch created the filters. for Roon. Thanks for another great article!

[The Computer Audiophile]

4 hours ago, danadam said:

The link doesn't work (404 Not Found)

 

Correct link: https://www.hdtracks.com/#/album/5bffcf17c6e102670ab3fbc6

Fixed both links. 

[R1200CL]

1 hour ago, Quad 405 said:

I'd like to give a shout out for Mitch's Accurate Sound Calibration service and his book.  My Kii Threes are sounding even better after Mitch created the filters. for Roon. Thanks for another great article!

Nice. I taught only HAF offered such service. I wanted actually to ask him (Mitch) how good it is, but I guess that may be hard to answer now 😀
 

I assume Mitch’s service using Audiolence ?

 

 

[Quad 405]

I bought Audiolense XO and used it for the measurements and Mitch used it to create the filters. His book is based on using Acourate.

[R1200CL]

17 minutes ago, Quad 405 said:

Audiolense XO

Would one need XO, or is 2.0,sufficient ?

[R1200CL]

EDIT:

I just realized that Mitch is some sort of partner with HAF, and even use their Room Shaper SW. 

 

If Hope this mean files returned from Mitch also include the Room Shaper correction. That would then mean it’s not so important to have this SW converted into something HQPlayer or Roon server (meaning NUC, NAS, SonicOrbiter) can use.

 

 

[R1200CL]

1 hour ago, R1200CL said:

My Kii Threes are sounding even better after Mitch created the filters.

Are you saying Kii’s own DSP SW can be edited ?

Or Did you first do AL filters before Kii, and then Kii DSP filters ?

[mitchco]

Hi @R1200CL

 

Here is my review of Thierry's Room Shaper SW. Note Thierry's RS is based on events detection and modifications of only some portions of the input signal. It requires a VST plugin to operate.

 

Re: Audiolense XO - this version has the time domain correction capabilities which I recommend.

 

I use commercial DSP software like Acourate, Audiolense, and Dirac designed for loudspeaker and room correction.

 

Kind regards,

Mitch

[Quad 405]

34 minutes ago, R1200CL said:

Are you saying Kii’s own DSP SW can be edited ?

Or Did you first do AL filters before Kii, and then Kii DSP filters ?

The AL filters were added to Roon and then via an opticalRendu to the Kii Control. I changed the Kii boundary setting to -6 before taking the initial measurement but left the other Kii settings to default.

[ASRMichael]

Fantastic write-up

 

Can you/ accurate sound produce convolution filters for HQ Player?
 

@mitchco
 

 

[mitchco]

12 hours ago, blue2 said:

Excellent article! Could you provide some more details about how you achieved these results? It appears the filters were measured and applied via Audiolense? What hardware was used for DSP playback? I appreciate a full answer would be another full length article so brief details of the hardware, software and measurements would be fantastic.

Thanks

 

Thanks @blue2 Other than a UMIK-1 mic, a Mac, and REW to take the measurements, the hardware is listed under the picture of John's @Olesno system. I can export the REW impulses and import them into Audiolense.

 

On this site, you will find a number of "walkthroughs" I wrote using Audiolense, Acourate, and Dirac. These should provide you with most of the details to your question.

[mitchco]

2 hours ago, ASRMichael said:

Fantastic write-up

 

Can you/ accurate sound produce convolution filters for HQ Player?
 

@mitchco
 

 

 

Thanks. And yes.

[ALLDIGITAL]

Mithco, thank you for a very informative article. I currently use a INNUOS Zenith SE MKII music server running ROON Core. I tried room correction in the past unsuccessfully using an Anti-mode 2.0 system. I am now considering two different approaches to room correction:

1. Roon Convolution filters 

2. New amplifier with room correction in the amplifier. (Lyngdorf TDAI with Room Perfect)

Assuming you are familiar with Room Perfect software, would you please share your thoughts on this product.

What approach to room correction do you think would yield the best results. Thanks for you consideration of of questions.