Recent content by serko70

  1. serko70

    Odd peak at the end of the response after vector multiplication

    John, You are right as always. I repeated the whole process for Left speaker with rectangular windows, FDW, smoothing, replicated data etc. There are glitches in the curve even in the 20-200 Hz area although the PA smoothed final results look almost identical throughout. So even if we could...
  2. serko70

    Odd peak at the end of the response after vector multiplication

    Equalizer APO, open source free convolver for PC - no Mac :( I export impulses directly to EQ APO's config folder, save the new configuration and following REW measurements run convolved, works perfectly with rePhase wav files and most (EQ wavs work perfectly, divisions introduce huge delays)...
  3. serko70

    Odd peak at the end of the response after vector multiplication

    Thank you for the detailed and valuable information. I am trying to stay in REW throughout. You cannot do vector arithmetic in rephase and you cannot import (or export) impulses. I plan to use it for filter linearization at the end. There were various smoothing and FWD steps before convolving...
  4. serko70

    Odd peak at the end of the response after vector multiplication

    John, just figured if I select "replicate data outside range" option while creating excess phase then the inversion of EP and its vector multiplication all come out normal (without a tail peak). So may be this should not be optional?
  5. serko70

    Odd peak at the end of the response after vector multiplication

    L0 is smoothed, FD windowed actual measurement (L). "Filters L0" is measurement generated from L0's EQ filters. L0-EP is excess phase of L0. The problematic multiplication "L_Correction" is the result of "Filters L0" x "Inverted L0-EP" Thanks
  6. serko70

    Odd peak at the end of the response after vector multiplication

    Dear John, The bottom response in purple is the vector multiplication (A * B trace arithmetic) of the top two responses and creates that odd peak at 24,000 Hz. The original sweep was 0 to 24kHz so I'm guessing it's some sort of an overflow error due to end of data there. I cannot find a way to...
  7. serko70

    Subwoofer placement: Near field better?

    I don't remember in full detail but there were also L+R speakers and their interactions in my simulation...
  8. serko70

    Subwoofer placement: Near field better?

    I have tried placing the sub right behind my head at ear height in the past (it's not possible to do in my current set up) and I fully agree with McGowan's claim. I came up with this idea while trying to simulate my room with REW. You get the smoothest bass response when you raise the sub to ear...
  9. serko70

    Taking Yamaha's Latest Flagship for a Sonic Test Drive: RX-A8A AVENTAGE 11.2-Channel AV Receiver Review!

    I think YPAO is doing the right thing here and leaving higher frequencies alone as any EQ there would cause major phase shifts and the added benefit in frequency volumes would change within inches of the LP. I wonder how is Dirac correcting the phase shifts with such massive equalization up to...
  10. serko70

    Please take a look at my waterfall.

    https://community.roonlabs.com/t/a-guide-to-advanced-room-correction-with-rew-and-rephase-using-convolution-filters/90990
  11. serko70

    Please take a look at my waterfall.

    How is REW tweaking your sub equalization? Do you have a minidsp or something? Anyways there seem to be some audible ringing between 30-70Hz in your measurements which is very hard to damp with treatment and will take a lot of space in a small room. Assuming you have a digital filtering system...
  12. serko70

    Eye-opening analysis on Tidal MQA

    The tests run by this guy seem legit but MQA still sounds either no different or better to my ear. I think the noise introduced by MQA at 20KHz is inaudible for most of us unless there are teenagers among us who could and would afford high quality audio gear. And MQA is probably doing some good...
  13. serko70

    Thoughts on my first REW attempts

    The sharp drop around 59 hz Sam has pointed out is speaker boundary interference. I am guessing your front speakers are 125-130 cm away from the front wall which is causing that dip. Your speakers lower bas limit is 50 Hz which has 1/4 wavelength of 150 cm. So if you can move your front...
  14. serko70

    Thoughts on my first REW attempts

    Your SR (from 70Hz onwards) and SL (from 200 Hz) are out of phase with the rest of the speakers (see attached). This is causing the dip between 100-300Hz. Since I checked phase overlays from noaud measurements, this can't be filter related. They might have faulty crossovers. SBR SBL and C all...
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