Does the 120º dispersion of the DV12 cause interference or comb filtering if the speakers are too close together?

Does the 120º dispersion of the DV12 cause interference or comb filtering if the speakers are too close together?

Q: What is the minimum width the DV12 speakers should be distanced from one another, and will being too close cause interference?

A: The minimum width between a left and a right speaker is, in effect, the width between two ears, like headphones. The next point about minimum distance is about how many people can listen to both speakers. If the speakers are too close together, very few people will be able to experience “stereo”. People to the left of the left speaker and people to the right of the right speaker won’t get much benefit from the use of 2 speakers. 

Comb filtering is another issue altogether, and the issue isn’t really applicable to stereo pairs. Comb filtering does occur with stereo pairs but it’s less noticeable because the brain isn’t processing the two inputs trying to determine what frequencies are missing. Specifically, different frequencies are missing from the input to each ear, so the other ear can fill in the blanks. 

Comb filtering occurs when there are two sources of the same information, but stereo sources do not contain exactly the same information, and our brains process the information differently. 

The information contained in the sound arriving first at the left ear and then at the right ear is compared to the information arriving first at the right ear and then at the left ear. If there is no difference between the two sets of information, the brain cannot determine location, and so the location is assumed to be center. 

If the listener is closer to one side than the other, more, if not most, elements will seem to be arriving from the nearer side. 

Comb filtering is worst, aka most noticeable, when two adjacent sources are producing identical output. In the absence of another, different or more distant source, the brain is able to recognize when frequencies drop out because they drop out dramatically, not slightly, and often they drop out from both ears. 

Back to the point, as long as the two speakers are on opposite sides of your head, and playing different (aka stereo) signals, comb filtering is not going to be a noticeable issue.  

Comb filtering becomes an issue when two speakers are playing the same signal and are at different distances from only one of your ears, aka on the same side of your head, (or one measurement  microphone.) 

The nulled frequency is more completely nulled if the difference in level is minimal, which is the case when the two speakers are very close together.  The nulled frequency is a function of the wavelength as compared to the difference in distance from one source to the other. The null will occur where one source is farther from the listener by half the wavelength of that frequency. 

The short version: Use one left speaker and one right speaker and try to fit the audience between them. 

The coverage angles are largely irrelevant in this scenario. The coverage angles and their effect on comb filtering are of greatest concern when arraying multiple speakers. 

The attached PDF shows two speakers 5 meters apart. The sound fields intersect 1.4 meters in front of the mid point between the speakers. (About 4.5 feet). Narrower coverage will move that point farther away, but is that desirable? 

Moving the speakers closer together will move that point closer. With cabinets 3 meters apart, the intersection point is about 1 meter in front of the cabinets. Having the speakers less than 10 feet apart isn’t a problem, it just moves the intersection point closer. If the worry is about feedback, the idea is that the mics should be behind the speakers. 
    • Related Articles

    • What types of connectors do BASSBOSS speakers use?

      MK3 Speakers: Signal: XLR in and Passthrough Control: etherCON in and through (for daisy chaining) Power*: powerCON to 3 prong Edison in and Passthrough Pre-MK3 Speakers: Signal: XLR in and Passthrough Power*: powerCON to 3 prong Edison (Some with ...
    • Can I daisy chain multiple BASSBOSS speakers together?

      Yes, you can daisy chain as many speakers as you want regarding signal, as that is simply a passthrough connection. It's recommended to daisy chain per channel, start with subs, and move to tops at the end. This is primarily for cable management ...
    • Video | 2-way vs. 3-way speakers - Unveiling the pros and cons

      Dive deep into the world of audio engineering as we unravel the ongoing debate surrounding the choice between 2-way and 3-way loudspeakers. Each configuration carries its unique array of advantages and disadvantages, profoundly influencing sound ...
    • How do I protect the back of my speakers for events?

      In order to prevent access to the amplifier's controls and connectors, there are smaller, simpler and cheaper options than building a box. The simplest, from a customer's perspective, would be to cut a piece of plywood about the size of the back of ...
    • Should I process signals going into my BASSBOSS speakers?

      Q: Can I use a DBX Drive Rack, or other signal processing gear in my BASSBOSS signal chain? A: All BASSBOSS subs already have all the processing built in, so they don't need, and should not have, any additional processing added to the signal chain. ...