I've deployed a 21-speaker near spherical array a few days ago, which I think is working ok, but I'm having difficulty with playing back some first order A-format recordings on it. They sound really very diffuse and not very localised at all. I figured that some of you good people on here might have some idea of where I might be going wrong or what is not right.
At the moment I'm using Reaper, and for decoding I'm using Matthias Kronlachner's Ambix decoder plug-in, with a configuration that I've calculated with Aaron Heller's Ambisonics Decoder Toolbox. I think the decoder configuration is right. I've calculated it with ambix ordering and scaling, and third order in H and V. The speaker array has six speakers at floor level (-22 degrees elevation), eight at ear level at 1m70 (0 degrees elevation), six at 45 degrees elevation and one at the apex. Now: if I pan monophonic sources using a panner (e.g. o3a panner, 3rd order), the localisation is pretty good. I've tested that with several people by panning to random places and asking to blindly point out to where they hear the source. Generally, they're in about the right place (say within 45 degrees on average.) On the other hand, if I play 1st order A-format recordings (mostly that I've made using our Core TetraMic), the localisation of sources is pretty poor. I also tried with the "xyz.wav" example file from Core (https://www.vvaudio.com/downloads) with the same results. To convert from A-format to B-format, I've tried using Core's VVtetraVST plugin with the calibration files for the mic (followed by the o3a FuMa to Ambix converter), and the Senneheiser Ambeo plugin (which does the same job, but in Ambix form already.) So what am I doing wrong? I've spent the last couple of days checking everything thoroughly. I've calibrated all the speakers to within 1dB SPL for the same signal received with an omni mic at the centre of the sphere. I've triple-checked that the encoder is in the right channel numbering: //------- decoder information ------- // decoder file = ../decoders/BSU_Array_6861_RAE1_3h3v_allrad_5200_rE_max_2_band.config // speaker array name = BSU_Array_6861_RAE1 // horizontal order = 3 // vertical order = 3 // coefficient order = acn // coefficient scale = SN3D // input scale = SN3D // mixed-order scheme = HV // input channel order: W Y Z X V T R S U Q O M K L N P // output speaker order: S01 S02 S03 S04 S05 S06 S07 S08 S09 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 I'll welcome any suggestion or advice! Thanks, - martin _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
