Room measurements

[DonH50]

I think the whole "notes running together" thing is more noticeable by its absence than presence. A fast bass run sounds much cleaner in a room that is less reflective, but most people prefer the sound in a livelier room as the notes tend to "ring" more. I used to do a lot of sound system installs for churches. Music sounded great in those big Gothic halls, but it was hard to understand the preacher with his voice ringing around the place.

 

[amirm]

I think the whole "notes running together" thing is more noticeable by its absence than presence. A fast bass run sounds much cleaner in a room that is less reflective, but most people prefer the sound in a livelier room as the notes tend to "ring" more. I used to do a lot of sound system installs for churches. Music sounded great in those big Gothic halls, but it was hard to understand the preacher with his voice ringing around the place.

That is indeed the trade off. For voices, the RT60 times needs to be less than 0.1 seconds (a vowel is 0.08 seconds) whereas for music it can be as high as 0.6. And for sure it is the absence that teaches one the difference.

 

[Bruce B]

Just got my USB mic that Amir recommended today. I'll try it out against my Earthworks M50

 

[microstrip]

Just got my USB mic that Amir recommended today. I'll try it out against my Earthworks M50

Coincidence? Mine left the customs a few hours ago, it will be delivered tomorrow morning! Looking for your comparative results.

 

[amirm]

Good deal. Let us know what your experience is.

 

[DonH50]

+1. Be nice to have something cheaper and easier to set up than my preamp, ext sound card etc. to drive my M30.

 

[vinylphilemag]

It must be "play with room measurements" time, because by calibrated EMM-6 arrived today! I'll grab a mic stand tomorrow and start playing with it soon.

 

[microstrip]

Maybe it is time to say : Les beaux esprits se rencontrent
Bob, are you happy?

 

[NorthStar]

Moi? ...Toujours content, oui. :b

 

[Bruce B]

In the thread "Alexia's Are Here", my last post was a room measurement that I took tonight. I did back to back measurements with the Earthworks and the Dayton with calibration file.... You know what??? I coudn't see a difference.... I zoomed in on the 20-20k tracing and coudn't see 1dB of difference. Go figure.
So... Dayton UMM-6 is HIGHLY RECOMMENDED! The best part is you don't need extra cables and outboard interface.

 

[Bjorn]

In the thread "Alexia's Are Here", my last post was a room measurement that I took tonight. I did back to back measurements with the Earthworks and the Dayton with calibration file.... You know what??? I coudn't see a difference.... I zoomed in on the 20-20k tracing and coudn't see 1dB of difference. Go figure.
So... Dayton UMM-6 is HIGHLY RECOMMENDED! The best part is you don't need extra cables and outboard interface.

The problem with a USB mic is that you can't run a loop (input to output). Meaning that the time of flight will not be accurate.

 

[Bruce B]

The problem with a USB mic is that you can't run a loop (input to output). Meaning that the time of flight will not be accurate.

Well up against an Earthworks M50 and a Digital Audio Denmark AX24, it's too close to worry about it!

 

[mep]

I just shot my first video using my Nikon D5100 with the Nikon ME-1 stereo microphone and I should have looked at the specs better on the mic. It's only rated down to 70 Hz and sounds it. I need a better mic to use with my D5100. The video is currently uploading to YouTube and will be finished uploading some time next year. I will post a link when it's finished.

 

[Bjorn]

Well up against an Earthworks M50 and a Digital Audio Denmark AX24, it's too close to worry about it!

Frequency response isn't the same as time domain. If that's what you were referring to.
Have you ran a loopback with the DAD and compared the time domain to the result with the Dayton?

One MUST account for the contribution of the instrumentation system to the total arrival time, such that it can be identified and substracted from the total measured time. Total arrival time - Actual TOF + propogation delay. Thus Total arriavel time - propagation delay = Actual TOF. Looback provides the propagation delay. Difference of the time of the loopback from the total measured arrival time= the actual TOF

 

[andromedaaudio]

Cool . id like to see the result ,as i am also going to buy a dslr camera with video function .
The first great advantage of a external mike is that you dont hear the camera noise through the recording .
So i m gonna buy a external as well , i found this one although it also drops below 60 hz , but not like a stone .
It can also be ordered with a 3,5 mm pin , iirc

It looks like 5 db down at 20 hz .solid line

http://www.rodemic.com/mics/ntg-2

I just shot my first video using my Nikon D5100 with the Nikon ME-1 stereo microphone and I should have looked at the specs better on the mic. It's only rated down to 70 Hz and sounds it. I need a better mic to use with my D5100. The video is currently uploading to YouTube and will be finished uploading some time next year. I will post a link when it's finished.

 

[mep]

Cool . id like to see the result ,as i am also going to buy a dslr camera with video function .
The first great advantage of a external mike is that you dont hear the camera noise through the recording .
So i m gonna buy a external as well , i found this one although it also drops below 60 hz , but not like a stone .
It can also be ordered with a 3,5 mm pin , iirc

It looks like 5 db down at 20 hz .solid line

http://www.rodemic.com/mics/ntg-2

I wouldn't recommend the Nikon ME-1 unless you wanted to buy mine and then of course I would tell you how great it is! By the way, I did post a video under "Reel to Reel" that shows my Otari MX-55 playing back a 15 ips 2 track tape from the Josh Berman Trio that was made from my Nikon D5100/Nikon EM-1.

 

[microstrip]

(...) So... Dayton UMM-6 is HIGHLY RECOMMENDED! The best part is you don't need extra cables and outboard interface.

I am also very pleased with - Amir recommendation was great. I have calibrated it using the supplied file and a reference soundmeter, but as the digital output level is very low, I receive in every measurement one warning of REW, stating that the level is too low. Is there any way to avoid it?

 

[Bruce B]

I am also very pleased with - Amir recommendation was great. I have calibrated it using the supplied file and a reference soundmeter, but as the digital output level is very low, I receive in every measurement one warning of REW, stating that the level is too low. Is there any way to avoid it?

I had to go into my Control Panel under "Sound and Audio Devices". Under "Audio" you have an option for "Sound Recording" and there it will list the UMM-6. This it will allow you to increase the input sensitivity.

Also if you're using REW, go into your Preferences page and on the right hand side it will say "Control Input/Mixer Volume" and below that "Input Volume"

 

[microstrip]

I had to go into my Control Panel under "Sound and Audio Devices". Under "Audio" you have an option for "Sound Recording" and there it will list the UMM-6. This it will allow you to increase the input sensitivity.

Also if you're using REW, go into your Preferences page and on the right hand side it will say "Control Input/Mixer Volume" and below that "Input Volume"

Just did it at the Control Panel - thanks! It seems that default after installation was very low.

 

[amirm]

The problem with a USB mic is that you can't run a loop (input to output). Meaning that the time of flight will not be accurate.

That is a limitation technically but there is little reason to look at the time domain that way. If you want to know the position of reflections you can determine them geometrically and at any rate, one can do that work without even measuring!