Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums > LAB Subwoofer Forum

Horizontal vs Vertical Placement of Subwoofers

<< < (2/2)

Riley Casey:
Every surface that is larger than the longest wavelength of interest ( say 40 hz for low E on a bass guitar at the low end ) will act as a mirror for the subs adjacent to it.  Keeping the subs on the ground ensures thats true for all frequencies the sub is likely to deliver.  Even at 80 hz ( a common frequency to low pass out of the subs ) the wavelength is over 12 ft so the coupling holds true.  Where it gets complicated is when you separate the subs by distances large enough for the sound to start to cancel as it arrives increasingly out of phase.  Like on opposite sides of the stage.  A big reason why large sub arrays are usually a continuous line across the front of the stage.

Mal Brown:
I have 4 kw-181ís.  I always stack when deploying all 4.  The port configuration is why.  Ported on the side.  Feet on the bottom. 

Vertically, the ports and drivers align. 

Horizontally, unless you flip one on itís head, thereby burying the pole mount and performing unnecessary roughness on the coating...  you got speaker, port, speaker port.  Not as good...

Chris Grimshaw:
The port is only really doing anything at around 40Hz. Does port placement really make much difference? We're talking about wavelengths of the order of 30'.

Chris

Ivan Beaver:

--- Quote from: Chris Grimshaw on October 29, 2018, 04:26:43 am ---The port is only really doing anything at around 40Hz. Does port placement really make much difference? We're talking about wavelengths of the order of 30'.

Chris

--- End quote ---
It is not as much about the port placement, as the woofer placement.

You want the woofers to be closer so that at the upper end of the range they will couple better.

This of course depends on the freq and size of cabinet/distance away from each other.

Navigation

[0] Message Index

[*] Previous page

Go to full version