REW graphs and equalization

[Donr]

Hi everyone. This is my first post and I hope I am in the right forum. I built my HT of modest dimensions (21' x10.5' x 79") back in 2003. Lately, I have been interested in learning how my room behaves and how my equipment integrates with it. I installed REW and am learning how to use it to measure my diy sub woofer that I recently completed after purchasing the driver over 10 years ago from Mach 5 Audio here in Canada. It's the IXL18.2.2. I also got my hands on a Behringer EP2500 amp, FBQ1000 as well as the minidsp Umik1. My equipment is not very high end consisting of a pioneer VSX1020 av receiver, 2 Quest tower fronts, Cerwin Vega center, B&W front high speakers. The surround and surround back speakers are all diy DML speakers as well as a center DML panel to complement the Cerwin Vega. I think they sound good and that is why I want to learn how to use this stuff. I also have a 10" sub that I purchased also about 10 years ago and it is marketed as a 125 watts active sub. Dimensions consist of a 13" cube front firing driver and bottom flared port with a cutoff frequency of 33Hz. Well, that was a mouthful.
Anyway, I got the driver out yesterday and measured the T/S parameters using LIMP. I plotted them in Winisd which, suggests a closed enclosure for the driver. A ported enclossure would be over 7 cu.ft instead of 1.25.I don't know how they manage a cutoff of 33 Hz in such a small package. I took some measurements of the ported sub in my shop with REW and the mic at appprox 1/4" from the dust cap on axis. I repeated the measurements at a 2 meter distance. The measurement labeled DIY are of my closed 18" sub. Do these graphs look OK? I don't see a lot of difference between my18" sub and the 10"! I did many more measurements then what is seen here but, I saved the more relevant ones in this file. BTW1 &2 are in my shop and 3 to 5 are my HT in room responses with 5 using both subs.. Now I plan to use my 18" only in the HT. I will build another one later. I will learn how to equalize this but have another question. If I connect the FBQ1000 to the sub out of the processor with the equalized filters below 100 Hz and then run the processors own auto Macc equalizer for the rest of the speakers, will it defeat the purpose of the FBQ? Thanks for taking the time to read and respond to this long winded post. I will probably have more questions when the time comes to measure and equalize the whole room.
Don

 

[Wayne A. Pflughaupt]

Did you forget to post the graphs?

Regards,
Wayne

 

[Donr]

Did you forget to post the graphs?

Duh. I did. Fortunately, I realized that half the measurements were taken with my RS SPL meter. I took a few more yesterday with the Umik 1 at 80, 100 and 150Hz to see if it made a big difference in my DIY sub. I also took 1 of my 10" labeled Pin at 150 and then both subs at 150Hz. I left my front speakers connected and I don't know if I am suppose to. Now I am wondering how to equalize this! Also, why does this small sub almost match my 18" diy. I am guessing my cut off frequency is around 27 Hz. Based on these charts, what should my crossover frequency be. Fronts were set to small.
Don