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  4. How do I set the early reflections delay?

  • How do I set the early reflections delay?

    F
    F

    To my understanding early reflections are the first reflections from all walls and not from just one wall. This is why I don´t understand, why so many books recommend different ER-delays for different depht without calculating the left/right position of an instrument. 

    In a room, that is 25 m wide, a center instrument 5 m from my ear would have the same ER-delay of about 50 ms for the left and right ER.

    If it is positioned to the very right, the ER-delay should be around 30 ms for the right ER and 70 ms for the left ER. 

    So how is it possible to set the same ER-delays for different vertical depth like "close", "mid", and "far", without considering the horizontal position?
  • fritzflotowF
    fritzflotowF

    Your question is missing some information: Do you ask, how Vienna Suite convolution reverb can do that? It can't, because it cannot extract ERs out of the IR. Altiverb can do that and mir does it for sure. Or what plugin are you asking for?
  • K
    K

    Actually, Vienna Suite Convolution Reverb can extract early and late reflections from an impulse response fine by using the start/length controls and the provided envelopes.
  • F
    F

    In my case my audio-signal is split into three signals:

    - The direct signal going to a bus with altiverb (stage position on, ER and Tail off)

    - The early reflections signal going to an altiverb bus (stage position off, ER on Tail off)

    - The reverb signal going to an altiverb bus (stage position off, ER off, Tail on)

    So my question is, if I need to set different delays on the ER-busses for an instrument that is front left and one that is center.

    According to my calculation the left instrument would have e.g. 15 ms delay on the left early reflections, but 30 ms on the right early reflections. 

    I think, I need to set these delays manually (with a stereo delay), cause I doubt, that Altiverb is able to calculate these delays due to the following reasons: 

    1. If you have an Altiverb with direct signal, stage position and ER switched on, you hear no difference in the ER, weather you move the speakers to the very back right or the very front left. 

    2. If you try a workaround and send a signal from an Altiverb (with just the direct signal and the stage position on) to another Altiverb in order to generete early reflections from a altiverb positioned instrument, the second altiverb can´t know about the position of the incoming signal: 

    It just gets a signal, that is a little louder on the left, has a little EQ on it and maybe slight delays in the right channel. But these delays are calculated for a direct signal and don´t compare to the delays of early reflections.