Some of you have read my previous thread here: http://www.hometheaterforum.com/htfo...hreadid=201033 I've been trying to EQ my subwoofer, and attempting to do a decent job of it. I first downloaded the NCH tone generator, http://www.nch.com.au/tonegen/ , created 1/12 octave tones, saved them to a CD, and use that to EQ. I then downloaded the PEQ excel worksheet, http://www.pvconsultants.com/audio/eq/peq.htm , which is setup for 1/12 octave tones, has the ratshack correction factor built into it already, and appears to be set up to work WITH the BFD. Problem is, nomatter what measurement level I used, the peaks of the graph would be above the visible portion. Worked with it for about 5 hours, decided to bag it. Next up, ETF. Downloaded ETF from http://www.acoustisoft.com ; Bought a soundblaster MP3 soundcard, and got everything hooked up. Adjusted levels, great to go. Did the first sweep, and voila! It worked well. Here's where it gets fun. I can't figure out whether to use the "low frequency response" graph or the "logarythmic response" graph; I can't seem to get decent resolution on the "low response" graph, but "logarythmic response" will not let me see below 40- 80 hz at the maximum allowed gate time, 200ms with anything other than 1/2 octave resolution. Went through this for about 9 hours yesterday, and bagged it. So, I call acoustisoft today and spoke to Doug. He first tells me to go through the demo room, which I have done twice. He tells me it takes some people a few times through to understand it. I explain to him that I'm just trying to EQ sub 100 HZ material, and that i've already determined placement. I just need to know which graph to look at, and how to get decent resolution on that graph. He says that he is not able to display a decent resolution on the logarythmic graph at the low frequencies without going above a 200ms gate time, which would require the software to be rewritten. Ok, that doesn't appear to be an option then. He tells me that he is writing a software upgrade that will allow the software to be used w/ a parametric EQ to simulate filters, etc. This will be free to paid users of the program. Expect sometime in the next few months. BUT - and here is the clincher - he says that without the PSD/Sweep upgrade ($75 in addition to the $150 cost of the software), the software does not reliably display sub 50-60 hz material. He insists this is the case, and said it's not worth doing without this upgrade. He then tells me to just figure out placement of the sub, wait for his software, and "i'm really busy today, and don't really have time to explain this. Go through the demo room again and it'll click for you" SO, to recap. -ETF will not allow you to reliably EQ your sub in below 50 hz material without paying for the program, $150, and paying for the PSD/Sweep upgrade, $75, in addition to cables, RS meter, and an external soundcard (if you don't have a full duplex card, which I do not). -If you want to view logarythmic response in sub frequencies in a greater resolution than 1/2 octave, you are SOL until someone rewrites the software to accept a greater gate time than 200ms. With this nice deficiency, it should be nice to figure out how to effectively use filters to address peaks when you can't even view it in the context of how the filters are applied (1/6, 1/12 octave, etc). If someone here has different view than the author of the program, I'd love to hear it. As it stands, from the horses mouth, we cannot use this progam to EQ our subs. I know I've read in this forum that some have done it, but from the authors own mouth, it cannot be done without buying an upgrade, and even then, you cannot view it in a logarythmic scale. SO, back to square one. I should have listened to Wayne P. and just used the 1/6 octave tones/Snapbug worksheet. After wasting a whole weekend of screwing around with a bunch of software that won't work, I'm back at doing the manual method again.