Linkwitz-Riley filters may sum well electrically, but not acoustically. For this reason I think their best function is as targets, but not a generic crossover filter design recommendation. For example: 👎 "Using LR24 filters will give you a flat acoustic frequency response through the crossover region." 👍 "Using LR24 targets will give you a flat acoustic frequency response through the crossover region." Then, choose whatever filters are appropriate to hit the … [Read more...]
How to Set Subwoofer Delay (6 top brands agree)
You don't need expensive equipment or a PhD to set subwoofer delay time. In fact, all you need is: The physical distance from the listening position.The pre-alignment delay values. Sound too easy? Consider that top brands like L-Acoustics, d&b audiotechnik, Coda Audio, RCF, Funktion-One and dB Technologies all recommend the same subwoofer phase alignment method. Create an alignment preset for two sources that are equidistant.Modify that alignment in the field, using delay to … [Read more...]
How to phase align main to sub in Smaart, REW, Open Sound Meter, SATlive, and Crosslite
The audio analyzer functions primarily as a verification tool. For this reason this article will focus on creating alignment presets, which can then be modified in the field using simple distance measurements. To fit this into a single article I will offer an overview of a single method for each software. Although the steps with each tool might differ slightly, in general they follow this pattern: Measure each source solo.Do whatever is necessary to achieve alignment.Measure sources … [Read more...]
Can you remove reflections from live measurements for more accurate alignments?
In my last article I found some minor success in validating subwoofer alignment indoors through the use of carefully chosen microphone locations and their average. Next up: Can it be done live in real time? Thierry De Coninck sent me an article he had written outlining a procedure that would allow you to not only create these averages, but also set the delay locator for your transfer function based on distance to avoid any errors from reflections or lack of HF content arriving at ground … [Read more...]
How to Estimate Delay and Level Offset Between Speakers in Your 3D Models
Save time in the field by presetting your speaker output delay and level offsets. Here's a model from a recent show where I estimated the level and delay for a pair of relay speakers and line of front-fils. If you know the difference in distance between two sources, you can accurately estimate their time offset, and therefore, the delay necessary to bring them into alignment. The challenge is finding the correct crossover point. Drawing About Sound Crossover (spatial): An … [Read more...]