What do you use to measure below 20hz?

[warnerwh]

It dawned on me nothing I have will measure below 20hz. I have a DEQ 2496 and a Rives cd but I don't think they go lower than 20hz.

[ThomasW]

Room EQ Wizard will measure down to 10Hz.

Note: see post #7 for a link to download the newest version of Room EQ Wizard

If you don't want to join a forum to get a copy you can instead download it here http://www.f-forge.com/?d=9hD0Mi4VByYRza3udlg6

It requires the Java Runtime Program, you can download that here. Install this before installing Room EQ Wizard http://www.java.com/en/download/manual.jsp

TrueRTA will measure to 10Hz

http://www.trueaudio.com/rta_abt1.htm

[warnerwh]

Thank you!

[capslock]

The question should rather be, what microphone measures reliably down to 10 Hz. A defined small leak is need to accomodate changes in barometric pressure, but if it is too big, a LF response drop will result.

Having looked at Electret caspules from Panasonic and other manufactures, I wonder how defined the leaky seal is.

[capslock]

But why would you want to measure 10 Hz anyway? The only application I can think of would be microphonic feedback, where you need a sensor cutoff below the passband to avoid phase issues.

[Xmax BR]

Dears,

REW Version 4.0 Now Available for Download...

http://www.hometheatershack.com/forums/attachments/bfd-rew-downloads/1830d1169507863-bfd-guide-room-eq-wizard-downloads-wizardinstallv4.00.exe

Tks,

Renato

[ThomasW]

One can directly download the zippped version of REW 4.0 Gold here
http://www.f-forge.com?d=zVGa5u4cSHlL8jQAxWbD

And one can directly download the exe file version here
http://www.f-forge.com?d=Ao5ycn03buSqpxQ9vDae

[cjd]

10Hz measurement is useful when trying to make sure you have accurate response that low.

I have recordings done on an organ with a 64' (8Hz) pedal.

C

[JonP]

Hmmm... the first link for the zip file has gone extinct.. the second works but you need a password to start the download.

The earlier version worked (a few days ago)

[TacoD]

The question should rather be, what microphone measures reliably down to 10 Hz. A defined small leak is need to accomodate changes in barometric pressure, but if it is too big, a LF response drop will result.

Having looked at Electret caspules from Panasonic and other manufactures, I wonder how defined the leaky seal is.

Indeed, I think the mic will be highly unreliable, also the amount of datapoints in the <20 Hz region will be small for the typical acquisition soft/hardware.