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I need help interpreting these Room EQ Wizard graphs please.

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I need help interpreting these Room EQ Wizard graphs please.

Postby jodaki » Thu Jul 25, 2019 4:19 pm

Hi,

I would like to fix any faults where possible in my monitoring environment so I have just run some measurements with REW (Room EQ Wizard)

I used a C414 XLS in omni as my reference mic.

However I admit that I really dont understand the majority of what it talks about or is showing me.

I have attached the graphs of the last test I ran and was hoping somebody more knowledgeable could help me interpret them.

many thanks for any help, John

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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Studio Support Gnome » Thu Jul 25, 2019 8:10 pm

fundamentally it is telling you , that you need bass traps. Great big hairy assed bass traps capable of treating significantly below 100Hz.
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Hugh Robjohns » Thu Jul 25, 2019 9:35 pm

Brief, but precisely to the point! :D
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Martin Walker » Fri Jul 26, 2019 9:42 am

Even non hairy-assed bass traps will help, and may fit more neatly with the rest of your decor ;)


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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Mixedup » Fri Jul 26, 2019 10:55 am

Yup. Bass trapping very much required.

Unless I'm misinterpreting this, it looks rather like there's also evidence of a first floor-reflection issue (circa 120-130Hz). More on that here...
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Wonks » Fri Jul 26, 2019 10:56 am

Hairy-arsed bass traps if you don't mind, gentlemen. We are British, you know.
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby jodaki » Fri Jul 26, 2019 11:07 am

Thanks for the help!

I have used the hairiest traps I could find for the moment (several dense straw bales - very hairy) and have moved the monitoring position.

Would you mind telling me which is/are the most useful graphs to show, and I will post the new measurements?

Many thanks again, John
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby jodaki » Fri Jul 26, 2019 11:13 am

Can I also just say to 'mixedup'. I am damm impresssed! by your noticing the ceiling! you are absolutely correct, the space is complicated but essentially I have been monitoring into a space under a mezzanine floor :) I am now monitoring in a space with a roof the shape of a number 4
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Wonks » Fri Jul 26, 2019 11:26 am

The SPL ones are probably the most useful as they are the ones bass traps and broadband absorbers directly affect. If you can get a pretty flat frequency response at the listening position all the way from 20kHz down to at least 30Hz, then you've probably done all you can (but you may struggle at the lower end of that).

The rest of it, reverb times and the like, are then really down to the size and shape of the room. You haven't got long reverb times anyway, so adding even more bass trapping and broadband absorbers to reduce that whilst keeping frequency response flat isn't really worth it.
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby jodaki » Fri Jul 26, 2019 11:42 am

Thanks Wonks,
Here're the latest SPL graphs. Is this better? Im struggling to see much that is pretty flat anywhere...

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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby jodaki » Fri Jul 26, 2019 11:42 am

or maybe that is pretty flat. I dont know :headbang:
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby Wonks » Fri Jul 26, 2019 12:46 pm

It would help to see those on a better Y-axis scale. Even 50dB to 150dB would help - but that's still a wide variation. All those big dips from 600Hz upwards should be easy to deal with using broadband trapping, which would help in the lower mids as well.

But no they don't look very flat at all. Max (SSG) is normally happy with a ±3dB range from a nominal level, but in some rooms that's very hard to get. You are currently a long way from that.

You also need to consider how much effect the measurement mic itself and the monitors used have on the resulting graph. They won't introduce 30dB peaks or dip, but they will have some effect on the results.
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby hobbyist » Mon Jul 29, 2019 4:11 am

jodaki wrote:Hi,

I would like to fix any faults where possible in my monitoring environment so I have just run some measurements with REW (Room EQ Wizard)

I used a C414 XLS in omni as my reference mic.

However I admit that I really dont understand the majority of what it talks about or is showing me.

I have attached the graphs of the last test I ran and was hoping somebody more knowledgeable could help me interpret them.

many thanks for any help, John


This wont be a popular idea, but use earphones and avoid the problems fixing the room along with a bundle of money.
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Re: I need help interpreting these Room EQ Wizard graphs please.

Postby blinddrew » Mon Jul 29, 2019 9:58 am

Always worth having and getting to know a decent pair of headphones (and think about something like Sonarworks as well). Gives you a much better representation of the low-end and allows you to work when other people aren't... ;)
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