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Thanks a lot guys for the replies. Literally figured this out just an hour ago after going through countless threads. Much appreciated.

Still it doesn't appear there's a way to calib the card of the MBP. If I do find it I'll post back.
 

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Thanks a lot guys for the replies. Literally figured this out just an hour ago after going through countless threads. Much appreciated.

Still it doesn't appear there's a way to calib the card of the MBP. If I do find it I'll post back.
I would post it on the "REW forum" to get more exposure.

Any particular reason why you aren't using the laptops soundcard? How old is your laptop?
 

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Thanks a lot guys for the replies. Literally figured this out just an hour ago after going through countless threads. Much appreciated.

Still it doesn't appear there's a way to calib the card of the MBP. If I do find it I'll post back.
a generic file could be provided by the manufacturer, not the perfect solution, but better than nothing.
or one could use another PC to produce sound at different frequency and adjusting the level at every frequency using an oscilloscope then record the level on the test sound card, but that would be very time consuming.

So practically, you either use a USB microphone and forget about the error from the input of the sound card or you use a regular microphone and go through the whole process
 

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Hello, I couldnt get the program running straight. I did everything step by step. this is a brief video of my problem, if anyone can help i would really appreciate it.
 

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Hello, I couldnt get the program running straight. I did everything step by step. this is a brief video of my problem, if anyone can help i would really appreciate it.
You need to use the beta version of REW to get audio interfaces working properly on the Mac (Apple's version of the Java runtime had a lot of bugs in its audio handling, the beta version has a working Java runtime in it). You can get the beta version here. Note that you need OS X 10.7.3 or later and you should remove REW before you unzip the beta version bundle and drag it into the Applications folder.
 

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You need to use the beta version of REW to get audio interfaces working properly on the Mac (Apple's version of the Java runtime had a lot of bugs in its audio handling, the beta version has a working Java runtime in it). You can get the beta version here. Note that you need OS X 10.7.3 or later and you should remove REW before you unzip the beta version bundle and drag it into the Applications folder.
Wow worked wonderfully! Thank You very much
 

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Thank you for the great program and tutorial as well.

This will allow to do amazing discoveries about chamber resonance and much more.

Best vibes to all, much love and light for all
 

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WOW!! Didn't know that sound was this complicated...

I find the U-Tube presentations very fine... Also the REW docs are easy to get to and a good read...
Looks like another trip to 'DONATE' :wave:

By the several tips already received here it looks like I can keep the small laptop ( portable ) to take with a few patch cords to the hall...
Now to add help to possible good info, I read that a USB i/o for mike out and line in seems very dooable...

Going to U-Tube now to try and find best equipment to fix a room...
Maybe I misread some of the DSP adds, but it sounds like ( no pun ) that a dedicated DSP box just stays in the line to amp. for a most perfect room... Eh??

TNX from DaveR
 

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DSP is fine to address frequency related issues. It cannot address reflections or decay time nor can it address modal nulls. Those things need to be addressed by treating the room.
 

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OK, and thanks for that, bpape.. Then I take it that a DSP rig or 31 band EQ will do about the same with the exception of maybe the DSP cuts the bands into smaller widths each...
Now I have to ask if there is also a device that will correct for the timing as well??

Unknown territory me me, so TNX again from DaveR
 

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Sorry, I meant reflections or decay time... Understand that is a physical room fix...

To start off should I find a 'smart' dsp unit like the feedback destroyer or in my case since the application is permanent for one type of use would the 31 band EQ box suffice?

TNX again from DaveR
 

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DSP is more flexible and it's a parametric vs a graphic fixed type of EQ.

The drawback is that being analog in but providing digital processing, that is adding another A/D and D/A step. Depends on how picky you are bout your sound. If it's just for the LFE channels, it's fine. Personally, I wouldn't put something like that on my main channels.

There are also all analog parametric EQ's available - just that you have to do the tweaking yourself as opposed to running a sweep and letting the unit make the changes (which I'm not really fond of anyway - but that's just my opinion).
 

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TNX much Bryan,

That sets me in the right direction and I am greatful for your advice.
Right now it looks like staying with the 31 band mono EQ set for the only room that it will be playing in, and possibly something like a feedback destroyer down stream of the manual EQ just to take care of any 'surprizes'...

DaveR
 

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Like I said, the BFD is fine on the LFE channels. I just wouldn't use it in my mains chain.
 

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Hi Bryan! Sorry you haven't heard from me this week. This is part of why :).

I've been attempting to use the DBX M mic that comes with the DBX Driverack. By all accounts it's an omni mic made for doing measurements. I'm following the GIK-supplied video (much thanks!). The problem I'm having is that when I attempt to do the initial soundcard calibration I'm getting an error telling me that the level is varying by way too much - typically 57db and that I shouldn't use the calibration created.

I'm on Mac OSX 10.9.5 using an old RME Fireface. The Fireface has a software mixer (Totalmix) which allows for creating loopbacks. I've checked VERY carefully and repeatedly that I'm not accidentally looping the output to the input. When I get the initial input level calibration anywhere close to the output level - the resulting sweep measurement clips. I have to have it about 20db lower than the output to make the sweep stay in the green.

BTW, I tried selected the actual (ASIO) driver for the Fireface and the level variation was a LOT higher. in the 90's.

If it matters, my monitoring system is a presonus central station feeding a JBL subwoofer which in turn is feeding a pair Quested v2108 speakers.

Any help would be greatly appreciated. Thanks so much in advance for the great software and the assistance!

Pier Giacalone
 

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