On 6/4/19 2:48 AM, Sean Devonport wrote: ...
Reading that paper, the AmbiHome system, I notice it speaks about the two different sets of decoding coefficients for a dual band decoding with crossover point at 700Hz roughly, in order to maximise the velocity or energy for phase and loudness respectively. I've seen this used in the SPARTA plugins aswell. I was wondering if you've implemented this style of decoding within your Grail system at CCRMA? Or if you have kept the decoding for one entire band before applying the speaker and room tuning?
I'm always using two band decoders (except for the subs of course). I use ADT to create them, compile to SuperCollider UGens and use them from within my diffusion program. For "dome" setups I have found the AllRAD method to be the best to design them.
Also, do you normally need to tune the speakers before every performance? Do you find the quality fluctuates often?
For permanent installations (our 3D Listening Room - 22.8 - and the Stage small concert hall - 56.8) I do the calibration once - and redo it if there are significant changes in the speaker setup.
For our temporary installs (like the concerts last week) I redo the calibration every time, mounting of the speakers is always slightly different even for the same space. In lower frequencies DRC tries to correct for the room a bit - I use very mild correction so that it is more or less valid over a wide area (I use the DRC ERB profile as a starting point).
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