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TTS56A

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TTS56A last won the day on April 16 2016

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About TTS56A

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    Advanced Member
  • Birthday 10/10/1991

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    rcftts56a@gmail.com

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    Male
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    Italy
  • Interests
    Public Address Pro audio
  1. TTS56A

    Exporting phase data with REW

    Yes i'd like to extract the phase of my subwoofer and reverse it with a flat amplitude... rePhase is a vert goood tool but it doesn't let me to do this thing. It only allow to use pre-selected filters. I also tried to extract the measurement as txt and then editing it with excel. But i don't know any free software wich import a text measurement, and then export it as impulse.
  2. TTS56A

    Exporting phase data with REW

    Hello, is there a way to export only phase data from a measurement? I tried to export the minimum phase "Measurement as text" , but i get the spl data also. What i need is an impulse response as wav or text which has the minimum phase data of the measurement but flat frequency response. Then i can create a time reversed impulse of the measurement which i will use for corrections (example to compensate high pass behaviour of a subwoofer). Thanks!
  3. TTS56A

    Cloth vs rubber surrounds

    Thanks for the clarification Electrodynamic
  4. TTS56A

    Cloth vs rubber surrounds

    This is a good point, I also think that. But what i'd like to know is if really cloth/corrugated surrounds can generate the least amount of distortion compared to rubber one. I always knew that rubber surrounds are needed for long excursions and deep bass due to a lower fs. So i would think that what they told me is only a false myth
  5. TTS56A

    Cloth vs rubber surrounds

    Hello guys, i wonder if different type of surround can really make difference in terms of bass quality. I heard some people who say that cloth surrounds are better because they introduce less distortion when moving out, but i also know that a lot of good subs have foam or rubber surround. The question is not pro subs vs home subs, but more related to the linearity of surround. What do you think about?
  6. TTS56A

    Xmax Investigation

    Basically if sub is well decoupled from the ground, it can't directly trasmit vibration on the earth. Why do you think that very low frequencies can't be reflected?
  7. TTS56A

    Xmax Investigation

    I asked it because by looking at the formula it seems to be calculated in full-space, but i'm not sure. However i think all point sources which would be a subwoofer in the lower range can be considered always in half-place (+6 db). Even if the sub is flying at 20 meters. Different the case when the mic is not close to the ground, so the comb filtering will be achivied, but the overall gain is still +6 db.
  8. TTS56A

    Xmax Investigation

    A question, the spl calculated here ---> http://www.baudline.com/erik/bass/xmaxer.htmlis refered at 1 meter free space or half space?
  9. TTS56A

    Bulding the Room2 listening room

    Nice fast decay from 80 hz up. Is the response equalized? It looks very flat from 25 to 100 hz. Mmm and what causes that steep roll off at 20 hz? Maybe it is due to the lowest room mode, or just lacking with room gain.
  10. TTS56A

    Bulding the Room2 listening room

    Interesting, what about the step response?
  11. TTS56A

    Bass punch threshold

    Forgive me, but since many meters are weighted, are you sure that you are measuring in flat response? (it's was also my doubt from my first post). Anyway i say this because with A scale, for example, 50 hz are -30 db respect to 1 khz. Another issue could be the rms level, wich is typical 10-15 db lower than peaks. When i measure music and reading 90 db on my meter (without any weighting), the peak level is around 100-105 db depending on the crest factor. With live music it's not unusual to see peaks of 20-25 db above rms.
  12. TTS56A

    Bass punch threshold

    Good posting SME In these days i did a lot of measurements with continuous sines and pulses... and yes, for frequencies < 70-80 hz the same outdoor pressure was perceived a little more exciting than the indoor. I've also established that for frequencies below 40 Hz, the bass is more likely slamming, between 50-120 Hz i noticed what i would call punch, and from 150 Hz to almost 300 Hz more likely "punchy" or mid-bass punch. By the way i think we need to consider the peak net pressure rather then rms. However in my experiences 110 db peak is a bit over the threshold in the 50-120 Hz range, nothing impressive at all. A good dual 18" with 1kw in a vented enclosure is capable of at least 135 db peak at 1 meter in half place (outdoor, well away from boundaries). In a medium-size concert for a strong bass reinforcement, i've always seen at least 15-20 of these double bass cabinets. Then i would think that 40-50 meters away, the pressure is still around 120-125 db peak.
  13. TTS56A

    Bass punch threshold

    Let me understand... There is no pressure difference, because the overpressure cycle is longer than the body thickness, so the pressure is forcing equal in front and back of the body. This is ok... But if the pressure difference is lower, shouldn't be particle velocity lower too? Isn't then the particle velocity proportional to the pressure difference? If for frequencies <1 khz, there is no pressure difference through our chest, the intensity should be less. am i wrong?
  14. TTS56A

    Bass punch threshold

    I am working for that!
  15. TTS56A

    Bass punch threshold

    This is the link: http://www.avsforum.com/forum/155-diy-speakers-subs/1521106-spl-nearfield-subwoofers-brutality.html Yes, that 3d is very interesting
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