BillFitzmaurice.info

Hey Bill, and others. I've learned that two drivers doing the same frequency work placed side by side in a horizontal fashion cause bad dispersion issues in a live situation.

Due to this, I've been curious what you guys think about speakers in cab that are diagonally staggered like the old Sunn Sceptre 4x12 guitar cab. Here's a photo:

Comb filtering in the high frequencies is a problem with horizontally placed drivers, I wonder if it's a problem here?

Anything other than vertical is a compromise.

I'm interested to learn more about that. Do you have a write-up on why vertical orientation works best? And does "comb filtering" still occur when two separate cabs (say two 1x15's) are placed next to each other?

There is an applet in one of the education linked pages for plugging in a frequency and seeing colour dB response fingers.

Side by side 15" cabs totally destroys your higher frequency dispersion as well as combing your lows.

Gregory East wrote: Side by side 15" cabs totally destroys your higher frequency dispersion as well as combing your lows.

Side by side cabs of any sort.

Turn it on its side and it'll be less of a problem. Reminds me of what Bergantino does with their 610.

Your ears are horizontal, so they detect horizontal differences. The amount of horizontal staggering changes which frequencies change where, but it still means the sound changes depending on where you sit. Or how you turn your head. Your ears can't detect vertical sound source locations, unless you tilt your head so one ear is higher.

Gauss wrote:Your ears are horizontal, so they detect horizontal differences. The amount of horizontal staggering changes which frequencies change where, but it still means the sound changes depending on where you sit. Or how you turn your head. Your ears can't detect vertical sound source locations, unless you tilt your head so one ear is higher.

Say what?

Gauss wrote:Your ears are horizontal, so they detect horizontal differences. The amount of horizontal staggering changes which frequencies change where, but it still means the sound changes depending on where you sit. Or how you turn your head. Your ears can't detect vertical sound source locations, unless you tilt your head so one ear is higher.

Phasing is not a problem that has to do with how the ear localize stuff which is based on the delay of the sound to the left and right ear. Phasing is problem caused by the nulls that are formed when two waves interact. And yes, vertical phasing is very much a thing. Just try crossing over an mtm over at around 6khz and if you stand up or sit down, the response will change dramatically.

The reason why horizontal phasing is always addressed much more frequently for PA sound is because your audience moves side to side, not up and down.

Bill Fitzmaurice wrote:

Gauss wrote:Your ears are horizontal, so they detect horizontal differences. The amount of horizontal staggering changes which frequencies change where, but it still means the sound changes depending on where you sit. Or how you turn your head. Your ears can't detect vertical sound source locations, unless you tilt your head so one ear is higher.

Say what?

I've heard the expression "dogs can't look up" before but this? This is something else.

So to assassinate Gauss all you need to do is be above or below him. Drop ninja style from above his eyeline, be as noisy as you like and he won't hear it.

88h88 wrote:

Bill Fitzmaurice wrote:

Gauss wrote:Your ears are horizontal, so they detect horizontal differences. The amount of horizontal staggering changes which frequencies change where, but it still means the sound changes depending on where you sit. Or how you turn your head. Your ears can't detect vertical sound source locations, unless you tilt your head so one ear is higher.

Say what?

I've heard the expression "dogs can't look up" before but this? This is something else.

So to assassinate Gauss all you need to do is be above or below him. Drop ninja style from above his eyeline, be as noisy as you like and he won't hear it.

Nooo.... he's right cuz your eyes are horizontal and you could see a good looking girl standing vertical but is different to see her horizontal. Part of medulla ablongata taught by Professor Colonel Sanders which holds the spinal to the Pons for disipation towards such as waves or oscillations, lose energy over time, typically from friction or turbulence etc etc etc....
To keep it short and sweet.

Vertical: Horizontal:

Amazing.

Sorry, that was a little tongue in cheek. Let me try to explain myself a little better. My main point was the way vertically arranged speakers don't have comb filtering in the horizontal plane -- their comb filtering exists in the vertical plane that ears don't normally travel in.

As for sound source detection (come at me, assassins ): Your ears have no mechanism to detect where sounds come from. Your brain judges where sound comes from based on the strength of volume between your ears, and the nature of the sound. That's why headphones can make things sound like they are behind you. For vertical sound source detection, one ear must physically be above the other or else the sounds have to encounter something in the atmosphere to give away their location.

http://en.wikipedia.org/wiki/Sound_localization

Gauss wrote:Your ears have no mechanism to detect where sounds come from. Your brain judges where sound comes from based on the strength of volume between your ears, and the nature of the sound.

Close. It does so via the difference in the arrival times at the left and right ear, not volume, which would be imperceptibly slight.

For vertical sound source detection, one ear must physically be above the other or else the sounds have to encounter something in the atmosphere to give away their location

No. The mechanism is unaltered by the orientation of the ears with respect to the source.