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  1. Monster null out of no where!

    REW Forum
    Folks, check this out. Attached is the final filtered response for my room and speakers. The top blue line is the combined response with both speakers, the red line is the left speaker only, and the green line is the right speaker only. Overall I am happy with the graph aside from the various...
  2. large null in theater room...help

    Home Audio Acoustics
    So, I have a large null in my theater room. I spent all weekend doing the sub crawl with an SPL meter and got both my sub's in the bester location. What else can I do? I ordered a umik1 and it is on the way. I have no room room treatment as of yet. I will post measurement when it arrives...is...
  3. First Time REW results - Two nulls - any ideas?

    REW Forum
    I have completed my first REW tests. It looks to me that my major problems are the 2 nulls at 90 and 500 (with maybe a whole other bunch of problems) and the bass ringing <80 on the waterfall chart. I could be COMPLETELY off, so any feedback is welcomed. Any ideas? I know my gear is not that...
  4. Is this null actually a room mode?

    REW Forum
    I'm going to turn my brain off and ask for help. Look at the image below. It's obliviously a room mode. Is this room mode what causes the initial "Null" at 69-76hz range? This is my HSU VTF-15H MK2 sub sitting between center channel and right channel front firing about 4" away from teh back...
  5. Room treatment is creating a null?!

    Home Audio Acoustics
    Hey gang, I've done more reading that I can even recall, prepping a listening room. The room itself is 14' 2.5" deep, 10' 1" wide, and 100" high (4.33M, 3.07M, and 2.54M). It is new/old construction mixed, so I had some studded walls to play with. On the old construction, the walls were...
  6. My First Graph with a null at crossover

    REW Forum
    I have generated my first frequency response curve for my subwoofer. Unfortunately, I have found a null at around 80Hz which is indeed my crossover point with the main speakers. As my Nuforce AVP-18 allows only 3 EQ settings for subwoofer, I have to manually increase the gain by 8db at 81.92 Hz...
  7. High Frequency Null at 4500

    Home Audio Acoustics
    Hi - Just starting do to some room treatments for 25 ft wide by 15 ft deep by 7.5 feet tall Home Theater/Music room. Just added a couple of front wall lower corner chunks, and a rear wall full corner chunk with Safe n' Sound. Got a pretty good idea what to do with corners and soffits, and...
  8. 135 bass null when both speakers play together?

    Home Audio Acoustics
    Hi Guys I thought I would see if anyone can shed a bit of light of why they think this might be happening When I run REW for my front L and front R I have nulls but nothing as drastic as below However when I run the front L and R together with the sub - I get one big null of 40db @ 130hz. The...
  9. 50 Hz null is gone, what now

    REW Forum
    Now that I finally managed to get the sound card calibration out of the way, I would like to ask for some guidance on how to interpret these new REW measurements. The main problem in my room used to be a large null around 50Hz. The FR graph below marked "initial" show this. First I moved the...
  10. Audyssey and bass Null's

    Audio Processing
    I have a reciever with Audyssey XT32. I haven't used it yet as my HT is still under construction. I know I have a null in my bass response at the seating position. Can Audyssey help fix this? If it can, how is it doing it? It must be more than just EQ adjustments? Just trying to understand how...
  11. Bass Null and phase?

    Home Audio Acoustics
    Hi all, I'm having an issue with my sub bass. Today was the first time I fired up my subs and I noticed a really bad null in the exact spot I will be sitting (figures!). My subs are in a fixed location (powered by one plate amp) and cannot be moved. I have two 10" subs per side (each pair...
  12. Low Midrange Null Fix

    Home Audio Acoustics
    Guys, I've finally gotten some time to try and hunt down my rather large null in the 250-500Hz range. Here is the graph of the left and right full range response (1/3 octave smoothing): As you can see there is about a 10db drop in the 250-500hz range. I have done close speaker...
  13. Null at 80hz, How to treat?

    REW Forum
    hi everyone, first time using REW. got it installed last week and rain some tests on my main speakers. the speakers were ran as FULL RANGE, no sub. at the listenting position (~12ft), I got a huge dip at around 80hz. however, when measuing the speaker about a ft away, i don't have any null...
  14. Large Null around 90Hz

    REW Forum
    I have been dealing with an issue for a while and would like some input. I have a large null at around 90Hz from my main speakers. I can deal with it a bit by increasing the crossover point of the sub, but I start to be able to locate the sub this way. Any input appreciated. Here are some...
  15. Null below first room mode?

    Home Audio Acoustics
    Hello! I have a serious null at around 20hz in my listening position. It's about 12-15dB down, and it's not very narrow either. The problem I have is that my first room mode is at 33Hz. So where does this null come from? If I know how it's created it would be easier to fix it. Other positions...
  16. Please help with 155Hz null

    REW Forum
    Below is a graph of my left speaker showing a major null at 155Hz plus smaller nulls at 123Hz and 88Hz, note the three almost equally spaced. These must be room induced as my right speaker is fairly flat in this range. I have two GIK 2'x4'x8" square traps and two similar triangular traps. I...
  17. Placing speakers in a null

    Home Audio Acoustics
    Hi! We all know there is a null midway between floor and ceiling. Nothing we can do about that. Sitting in this null is bad, of course. But what happens if you put your speakers in that null, and have your ears out of it? I just can't figure out what would happen. I will try it, regardless...
  18. Tame Mid-Room Null?

    Pro Audio
    Well, after months of lurking, research and construction, I am finally posting! I have completed our HT (Ha!) and now in the process of tweaking. The never-ending process. I have written a thesis here to enlist the best in the arena of HT set-up...the Shacksters. Please forgive the long...
  19. Null vs Dip

    SVSound
    What is the difference between a null and a dip? Here is the frequency response of my dual SVS PB13 Ultras. I know I need to get the subs out of the front corners, but I can't do that right now because my entertainment system takes up 3/4 of my front wall. I know I have a lot of room gain...
  20. Wierd Null

    REW Forum
    I am getting a wierd null at 140hz and can not seem to pin point the problem. Below is a screen shot. I tried messing with the phase and it did not seem to help at all. The Maggies and sub are crossed over at 120hz which may account for some of the null. Any ideas to the cause of this? :hissyfit:
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