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Regarding room measurement and filter creation


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Does it make a difference (e.g. in quality) in the results if one

 

a) uses the dedicated audio pc/mac and DAC for measuring the room and creating the filters, then using those filters for convolution

or

b) uses a different computer with a different DAC/audio interface for measuring the room, creating filters and then using them on a different computer (the dedicated audio pc/mac)?

 

thanks.

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I don't think so. I use my XTZ and laptop to measure my room, feeding the XTZ to the preamplifier. But for playback, I use a CAPSv3 into my regular DAC feeding the preamplifier. I program the parametric EQ XTZ suggested into the CAPSv3. I'm obviously assuming all DACs have linear frequency responses. I guess maybe that's not a fair assumption, especially with some of the more advanced digital filters.

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Does it make a difference (e.g. in quality) in the results if one

 

a) uses the dedicated audio pc/mac and DAC for measuring the room and creating the filters, then using those filters for convolution

or

b) uses a different computer with a different DAC/audio interface for measuring the room, creating filters and then using them on a different computer (the dedicated audio pc/mac)?

 

thanks.

 

It shouldn't make a difference as long as the DAC you are using for measurement is of reasonably good quality. Even an "audiophile" level sound card qualifies. You want something that can work at 24/96, as this is the level most DRC software works at.

Main listening (small home office):

Main setup: Surge protector +_iFi  AC iPurifiers >Isol-8 Mini sub Axis Power Conditioning+Isolation>QuietPC Low Noise Server>Roon (Audiolense DRC)>Stack Audio Link II>Kii Control>Kii Three >GIK Room Treatments.

Secondary Listening: Server with Audiolense RC>RPi4 or analog>Matrix Element i Streamer/DAC (XLR)+Schiit Freya>Kii Three .

Bedroom: SBTouch to Cambridge Soundworks Desktop Setup.
Living Room/Kitchen: Ropieee (RPi3b+ with touchscreen) + Schiit Modi3E to a pair of Morel Hogtalare. 

All absolute statements about audio are false :)

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  • 2 weeks later...

I'm not positive on it, but I believe it does make a difference because the clocks used for measuring and later playback are different. This is what I understood Uli Brueggemann, the man behind Acourate, told me.

 

I was planning to use a similar setup I use with REW, that from my point of view works: use a separate laptop for measurements with a Tascam external card for the mic, then the laptop connected to my Audiophilleo/Metrum for playing the signal. Uli suggested this introduced errors from the Tascam and Audiophilleo having different clocks, and I should compensate for it. This was in the context of time/phase driver alignment, though.

Roon Server: general purpose Gigabyte GA-Z170X UD5, i5 6600, Crucial MX200 SSD, HyperX 1x16GB RAM, Win 10 Pro, convolving in Roon digital xo + DRC + upsampling. Output through ethernet.

Roon Client AudioPC: Uptone etherRegen (with LPS 1.2) into Intel S1200KPR, Xeon E3 1265lv2, Crucial V4 SSD for OS, 8GB ECC RAM, Streacom FC8 Evo case, lab linear PSU, Windows Server 2019, AudioPhil's Optimizer, Acourate (digital xo, room correction)

Rest of Chain: Lynx Hilo as 8-channel DAC, McIntosh MC275 MkIV for mids & treble, Hypex UcD400HG for midbass into DIY dipoles 18" midbass/2x8" mids/AMT tweeter, 2 DIY 12" Rythmik subs, Equi=Core 1800 balanced power, dedicated power lines, room treatments

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Hm, OK. Thanks. I also asked Mr. Brueggemann about this and he said that it shouldn't matter, because the listening room is the main problem and much worse than the problems induced by different DACs. But I did not receive a definitive answer.

 

How could this be compensated? Is there a way to see or compare both ways in terms of quality?

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I'll just repeat: the scenario you mention is fairly typical for people setting up PC based room correction. A lot of users, for various reasons, have to use a different device for measuring and playback. Several of the companies that sell DRC software seem to anticipate this scenario in their literature, so I don't think it is critical.

 

I'd worry more about having a properly setup mic with it's own calibration file. That's your big variable and the most important one, I think.

 

 

Does it make a difference (e.g. in quality) in the results if one

 

a) uses the dedicated audio pc/mac and DAC for measuring the room and creating the filters, then using those filters for convolution

or

b) uses a different computer with a different DAC/audio interface for measuring the room, creating filters and then using them on a different computer (the dedicated audio pc/mac)?

 

thanks.

Main listening (small home office):

Main setup: Surge protector +_iFi  AC iPurifiers >Isol-8 Mini sub Axis Power Conditioning+Isolation>QuietPC Low Noise Server>Roon (Audiolense DRC)>Stack Audio Link II>Kii Control>Kii Three >GIK Room Treatments.

Secondary Listening: Server with Audiolense RC>RPi4 or analog>Matrix Element i Streamer/DAC (XLR)+Schiit Freya>Kii Three .

Bedroom: SBTouch to Cambridge Soundworks Desktop Setup.
Living Room/Kitchen: Ropieee (RPi3b+ with touchscreen) + Schiit Modi3E to a pair of Morel Hogtalare. 

All absolute statements about audio are false :)

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