Originally Posted by beastaudio
In the meantime you might want to review REW help configuration pages and the wiring configuration, as you will need a mic cable to connect the mic to the pre-amp, a USB cable to connect the Pre to the computer, an adapter to change the pre-amp output to an RCA compatible fitting and an ~10' male-male RCA cable (for the AV receiver input), and you will need an appropriate short 1.5-2foot 1/4" balanced male TRS to XLT male loopback cable for both preliminary frequency calibration as well as for hardware propagation delay compensation during measurements for impulse and ETC responses
The behringer uca202 takes all of these other things out of the mix as the soundcard already has usb to pC built in, rca in and outs. This is what I use with my RS meter, and it can be had on the SUPER cheap. works fine for measurements for me
I have confirmed all measurements with o mnimic as well, which is also a great quick-setup rig for simple FR. The new disc also has L/R tracks that can show you how comb filtering and such is affecting your system. so in my case to reiterate, I have REW (free), two rca cables (maybe $10), RS meter, berry mic uca202 ($30) and that is it. works great, all that I need at this point is more time to play
"The behringer uca202 takes all of these other things out of the mix "... It does not. But it does eliminate many capabilities of the rig.
I like saving money as much or more than the next guy, but when the tradeoff is a severe reduction in practical capability, that is where I draw the line on such imagined 'savings'.
First, it has no phantom power and does not accept balanced microphone inputs for a broadband measurement mic and limits you to the use of the RS mic that is anything but optimal or suitable for broadband measurements. And collecting all of this gear simply to make waterfall plots is a supreme waste of effort and time compared to what is otherwise made possible - but that is exactly what you get with either just the Behringer pre or OmniMic. And the ART USB pre comes with a USB cable as well - as if that makes or breaks the deal ... =S
So you 'gain' having to obtain an RCA adapter while sacrificing phantom power for condenser measurement microphones enabling broadband testing, balanced inputs enabling the use of broadband condenser microphones, and you necessarily limit yourself to low frequency waterfall tests that are but a smidgen of the useful capabilities that a platform such as REW provides...
The point is NOT to simply have a crippled rig capable only for simple low frequency frequency response measurements. Aside from the fact that the frequency response simply provides you with a summed result view of the myriad combination of variables without providing ANY insight into the nature or contribution or interaction of said discrete variables! The point of the measurement rig is to be able to look at the behavior in much more detail and to specifically identify the behavior of EACH of the contributing variables, to know each of their constituent parameters, and to thus be able to determine the nature, cause and subsequent solutions to the problems that are manifest as summed anomalies that is afforded by many more points of view than are afforded by a limited frequency or waterfall plot....The point is not to simply be limited to seeing only the resultant summed anomalies that result from superposition! In that sense the time domain view is causal and the frequency domain view derivative. And a platform limited only to the frequency domain view - and especially to the low frequency frequency domain - is a crippled platform compared to what is practical and useful.
IF the problem is simply one of the listening position being in a modal null at those frequencies, then it can provide an easier means of providing a quick mapping of the surrounding locations to see if moving the listening position forward or backward might avail a moderation of the effects of being located in a null.
Other than that, the fact is that we already know just about all we can tell by a simple frequency response measurement - and, except for the location of modal nulls, it is insufficient to isolate and determine any causal factors.
Folks would do well to spend a bit more time learning about the full range of behaviors and the measurements possible to evaluate them. And they would do well to familiarize themselves with the B&K Domain map that provides a simple overview of the various perspectives available by measurements and to what value such perspectives provide. There is MUCH more to the world of acoustics than the flatland that the simple frequency domain perspective provides - and I would suggest that folks examine and become aware of these factors before investing in alternative platforms such as XTZ and OmniMic that cost much more but provide a significantly restricted availability of important and necessary functionality.
Well, we would attach the Domain map, but we continue to get an error message that the PDF document "exceeds the maximum size of 0MB" - funny how that is a maximum that is bound to be exceeded.
So, if one is interested, I guess you can PM me with your email address and I could see if I can get around to sending a copy...