- Thread Starter
- #21
Hey @andreasmaaan, thanks for the input!
I have a pair of Don Keele's CBT24 speakers, and they definitely don't appear to have a sound source below the floor. In his 2005 paper (Keele et al 2005) we see the following sound pressure simulations for a legendre shaded curved array at 500Hz and 2KHz. You can see the even field extends above the top of the array at 1m distance.
You are right physical curving for delay is definitely simpler in some senses, but for short arrays the degree of curvature may get rather extreme. I haven't done the calculations yet but Rick Craig's experimental ones had almost a 90 degree curvature and required quite tricky woodworking for the cabinets (See PE Tech Talk thread Post 59). For initial experimentation at least a flat array and DSP would be more flexible and according to Don's research has only minor downsides for the soundfield
How the use of BMRs would affect this I have no serious idea, but in principle the wider the directivity of the drive units and the smaller they are the better, as the simulations are based on ideal transducers spaced only 1cm apart. In practice, as shown by the CBT24s, very good results can be achieved with much less than ideal designs. XO would likely be around 200Hz.
I have a pair of Don Keele's CBT24 speakers, and they definitely don't appear to have a sound source below the floor. In his 2005 paper (Keele et al 2005) we see the following sound pressure simulations for a legendre shaded curved array at 500Hz and 2KHz. You can see the even field extends above the top of the array at 1m distance.
You are right physical curving for delay is definitely simpler in some senses, but for short arrays the degree of curvature may get rather extreme. I haven't done the calculations yet but Rick Craig's experimental ones had almost a 90 degree curvature and required quite tricky woodworking for the cabinets (See PE Tech Talk thread Post 59). For initial experimentation at least a flat array and DSP would be more flexible and according to Don's research has only minor downsides for the soundfield
How the use of BMRs would affect this I have no serious idea, but in principle the wider the directivity of the drive units and the smaller they are the better, as the simulations are based on ideal transducers spaced only 1cm apart. In practice, as shown by the CBT24s, very good results can be achieved with much less than ideal designs. XO would likely be around 200Hz.