Home Theater Forum and Systems banner


  1. understanding THD distortion measurements

    REW Forum
    I have a two-way loudspeaker system in which I do not understand the THD measurements I obtain with REW. The woofer THD measures like this (first jpg) before the crossover filtering (low pass LR2, miniDSP): Then after the low pass LR2 filter it looks like this (2nd jpg), with lots of...
  2. Help with understanding REW phase

    REW Forum
    I've read that phase tracking, rather than using impulse measurements is the better way to align subs with speakers but have not been able to find a simple guide as to how exactly to use the phase plots in REW, so perhaps someone can shed some light on this. The examples of phase tracking...
  3. understanding the REW measurement SPL graph

    REW Forum
    So I successfully attached a UMIK-1 mic, downloaded the calibration file and the latest beta of REW 5.17 beta 14. I set the mic to unity gain in the audio midi devices and to 48khz input. Since I am a stereo listener I just have two speakers - about 10 feet apart toed in to point to the...
  4. Need help understanding process of testing combined response of individual filters

    REW Forum
    I understand that I need to take measurements of each channel of my stereo system separately. I also have a decent idea of how to apply EQ to each channel using a house curve. I assume that once I create the EQ filters for each channel I will want to measure the combined effect with both...
  5. Help with interpreting REW graphs and general understanding of audio characteristics

    REW Forum
    Hi all, I'm new to all this, so please bear with me. (Have attached 2 x REW settings files for your reference.) I got a Mac with REW, Behringer ECM8000 and an Apogee One audio interface. I have done a measurement at my home studio and I did one for a restaurant where I recently did a sound...
  6. Understanding SPL offset (UMIK-1)

    REW Forum
    Hello, I am using the UMIK-1 (Calibration file 700-9345) and Win7 for a student project and want to comprehend the final step of SPL computation in REW. I understand the steps for frequency- and time-weighting (dBA/C/Z, Slow/Fast). I located "HKEY_CURRENT_USER\Software\JavaSoft\Prefs\room eq...
  7. Understanding maximum volume (0db), with Audyssey

    Audio Processing
    Hello HTS! It's been a while, since i posted a thread on these forums, feel free to move it, if i got the place wrong. I recently upgraded my system with a used Denon 4311 - to get MultiXT32. I absolutely love it - everything sounds like heaven, and the 140w pr. ch (170w in 2ch) does a good...
  8. understanding the impact of the left window

    REW Forum
    This might be a stupid question but I don't know the answer so I will ask anyway :) Let's say you have a measurement of a speaker and you want to bring in the right window to remove some reflections from the response. Why can't you just move the left window out by the same amount in order to...
  9. UM18-22, Help understanding WinISD SPL, Signal EQ and cone excursion

    DIY Subwoofers - General Discussion
    I'd never used WinISD, but modeled a Dayton Audio 18" UM18-22 sub in a sealed 4 cu ft enclosure. I also don't have the sub or amp yet. I think I put the parameters in correctly, and seem to get a -3dB point close to what parts express shows. However, I don't fully understand the point of the...
  10. Need Understanding

    DIY Speakers
    Hello all! To a degree I understand speaker sensitivity. I have plans to build one of the proven designs from Speaker Design Works. What really interest me is the statements II. I also like the sentorians. If anyone has any input on either of these, I would be interested in hearing. Primarily...
  11. understanding the graphs

    REW Forum
    Hi guys i recently built a 18" subwoofer minimarty sub tuned for 15 hz , i have done some REW tests from the sub to the seating area. all the tests were done from the sub only. except for the last graphs where its fronts and sub. The sub is powered by inuke 3000dsp in bridged mode and set to...
  12. understanding check levels on scarlett 2i2

    REW Forum
    Hello All: My goal is to understand how to use check levels correctly. I have already a) calibrated my Scarlett 2i2 soundcard; b) loaded the calibration file for my Dayton EMM-6; and c) set my SPL output and input levels on my Scarlett 2i2 according to this article [1]. I can report the...
  13. Help understanding REW Auto EQ Algorithm

    REW Forum
    I am using REW to help tune my bi-amped JBL horn setup. I have a MiniDSP 2x4 so have the options to use up to 6 Bi-Quads. I am getting as far as running the "Match Response to Target" but I am just trying to understand how REW is picking the center frequencies, Qs and amplitudes of the 6...
  14. Understanding REW readings

    Home Audio Acoustics
    Hollo all. We have a studio in Spain and are measuring this with REW. But I need help understanding if the readings are good enough for a control room.... All help/input appreciated.
  15. Understanding phase graphs

    REW Forum
    When comparing phase of 2 drivers, it seems to be necessary to get the time alignment right first and then shift one impulse to t=0 and the other by the same amount. If I understand correctly, if this is not done correctly then the phase overlay is basically useless. Is my understanding...
  16. Help Understanding MartinLogan Depth i Controls

    Home Audio Subwoofers
    BACKGROUND I have two ML Depth subs in my dedicated Home Theater. They are connected via RCA LFE input to Sub1 and Sub2 LFE outputs of a Denon 4311CI AVR; balanced and calibrated with Audyssey MultEQ XT32. The subs are great in 7.2 DSX Wide multi-channel mode, but the kick drum in 2-channel...
  17. HDMI W/ Ethernet - Understanding

    Remotes | Cables | Accessories | Tweaks
    Ok so im looking at HDMI cables as I will need to upgrade soon to longer ones I seen they run Ethernet in the HDMI cables now. Was wondering how does this work If i get a few Im assuming the Ethernet pulls from the TV that is connected by Ethernet cable and sends the singnels to your...
  18. Understanding House Curve vs EQ settings in REW

    REW Forum
    Hi I'm new to REW but I've made some headway.. have calibrated my FA66 soundcard, bought a UMM-6 from Cross Spectrum, and made some measurements of my setup. Had to use the LineIn and SoundFlower workarounds to get audio working correctly on my Mac. I've generated EQ settings and transferred...
  19. Understanding the shape of the impulse response

    REW Forum
    I have been following jtalden's method for time aligning sub to mains in this thread. One point of discussion has been the relatively "messy" shape of the impulse response from my subwoofer and I am curious as to why this is and whether it is meaningful with respect to sound quality (aka is it a...
  20. Help me understanding this rew graph

    REW Forum
    I have unstalled some acoustic treatment. 24" superchuncks in front corners. Made frontwall dead with 2" rockwool. Reflectionpoints treated aswell. I want to know what you guys think of the measurements? Spl 1/24 octaaf smoothing