Here are my notes. - Measuring in the back of the room will you the largest area of matched tonality because of matched SPL loss rates. - Measuring at the front of the room has the most potential for tonal variance and coupling errors. - Measuring 120º from the back of the room may give you the best balance: larger coupled area in exchange for more tonal variance. - The "best" measurement position is a balance between maximum coupled area and acceptable tonal variance. - Careful not to mistake SPL Plane for SPL Plan. Calculator instructions: 1. Input subwoofer, main, and audience location. 2. SPL Plot freq = crossover freq * 1.26 3. Alignment offset = 2 * 120º. Use twice what you want to be left with at the back.
@@doctorcujo72 hey doctor, ideally we’d like to know where the origin of the sound is coming from. We often estimate this as the geometric mid-point of the array. bottom of array + (array span / 2) ≈ acoustic center
Yeah, and I loved loved loved how the SPL section view coincides with the floodlight in the RL-delta section view. The penny on sub alignment dropped in my head right there and then, bazinga and kablammo!
thanks for the video.. question i have i can't seem to find much on is alignment position when there are more central subs.. i.e. 6 blocks of 4 across the front of the stage. where can the alignment position be? any literature on this that you know of?
what processor would you recommend I have been just using dbx driveracks which may not be capable to do the job. I most seem to have cancellation of the left and right sub in small venues. what can I use to figure this
Hi Shad AFAIK driveracks allow you to set delay times and band-pass filters? LR cancellation is typical for that particular setup. Mono center sub cluster or horizontal array is the way to go. Alternatively for small venues, all subs together on either side of the room instead of LR has worked wells. Careful positioning might also alleviate room modes.
I have a question about the height of main: The height that we must indicate must be that of the highest speaker, the one that is lower, or the one in the center of the line array? Thank you very much for this fantastic tool.
Thank you for your inquiry and your kind words. For height I typically, take the middle of the entire array. At low frequencies, it acts effectively the same as a single point source.
