REW V5 Tips - Page 5 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #41 of 114 Old 03-24-13, 11:40 AM
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Per Ivar Nerseth
 
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Re: REW V5 Tips

Hi Sikus, You were right!

I have not considered the fact that the REW output file uses the current regional locale for it's decimal separator. Now the tool is updated and should work better.
I will upload the tool somewhere later tonight (gitub has disabled hosting executables).

Per Ivar
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post #42 of 114 Old 03-24-13, 06:08 PM
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Per Ivar Nerseth
 
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Re: REW V5 Tips

The updates releases of the REWEQ2EQPreset tool can be found here:
https://sourceforge.net/projects/reweq2eqpreset/
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post #43 of 114 Old 03-24-13, 10:52 PM
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Not sure if I'm on the right thread but for REW if I use only an spl meter what kind if info can I get on the sub?
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post #44 of 114 Old 04-13-13, 09:53 PM
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Re: REW V5 Tips

Thanks for the tips. I'm looking forward to useing it soon.
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post #45 of 114 Old 06-11-13, 12:32 PM
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Re: REW V5 Tips

Hello Folks and Thank You for the tips. I am a small studio owner searching for the most effective way to calibrate my studio monitors to my room. Short of the expensive treatment option. I look forward to browsing through the forum and discovering new tips and ideas.
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post #46 of 114 Old 06-11-13, 01:09 PM
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Re: REW V5 Tips

One thing I've come across is that upon initial measurement it gives me the signal too low at -90.3 db over and over again no matter how much I boost reference mic input or master volume. This of course after setting soundcard preferences to match my setup and checking to make sure the speakers (rather than subwoofer) was selected. "Check levels"...level is low -129.4. It isn't low I'm sure, it doesn't seem to be responding to the dbx reference mic set at the listener position.
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post #47 of 114 Old 06-11-13, 03:26 PM Thread Starter
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Re: REW V5 Tips

Quote:
bartman69 wrote: View Post
One thing I've come across is that upon initial measurement it gives me the signal too low at -90.3 db over and over again no matter how much I boost reference mic input or master volume.
That indicates REW isn't getting a signal to measure. Could be that in the soundcard preferences REW has been told to use the other channel, or you are on a Mac and using a Firewire or multichannel USB card (in which case you need to check the sticky thread on getting around Java problems on OS X), or a wiring problem etc. In any event best starting a separate thread and including information about your setup rather than posting in the REW tips thread, I'll remove the posts from this thread in due course.
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post #48 of 114 Old 06-11-13, 05:32 PM
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Re: REW V5 Tips

Got it John, Thank You! Yes a Mac. I'll look into it further here in a bit. I briefly went over some of the help menu but apparently missed it. Not uncommon these days!
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post #49 of 114 Old 08-07-13, 12:32 PM
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Re: REW V5 Tips

Thanks for keeping it so up to date!
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post #50 of 114 Old 12-02-13, 02:17 PM
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Re: REW V5 Tips

Hi Guys.
I am new here so please excuse me if this tip was mentioned in a different thread (but thread with tips for REW is here). Please also excuse my english :-)

My tip is for quick calibration of the SPL in REW with digital multimeter and microphone with known sensitivity in V/Pa (and cable of course). Calibration enables you to measure characteristics in absolute values and for example measure the loudspeakers distortion acording to SPL...

1) Run REW generator, set frequency 100 Hz (area where almost each digital multimeter has maximum accuracy), level as desired and mic gain as desired
2) Measure the voltage level at the output (or input of the microphone)
3) Calculate the SPL corresponding to measured voltage as follows:
Equivavelnt SPL = 20*log(Voltage measured/mic sensitivity) + 94 dB

example:
SPL = 20*log(1.6 Volts / 0.010 V/Pa) + 94 dB = 138 dB

4) set the generator to 1 kHz (frequency where all curves are overlaping) and keep it runing
5) run the SPL meter and start calibration, chose "use the external signal"
6) into the field for SPL readout type the calculated level, e.g. 138 dB and confirm finish

Now you can measure in absolute values, because this calibration is used for all the measurements!

PS: I have noticed that digital level in dBFS are different in some application even if the electrical level is the same (asio and java drivers give the same values)....
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