The power alleys and the lulls you actually can hear walking around a room. It's weird .. in one spot heavy bass .. move 10 feet left or right and almost nothing. The smaller the room and the more reflective the walls you'll hear it more than in a larger room. You won't hear it as much close to the speakers, but move out 20' and sometimes it's a killer.
May 7th I will be debuting my ZLX12 with quad ZXA1 Sub... I plan to stack two subs per side under each top speaker.... I found out that the subs allow for passive pass through of the audio so I will be able to shut off one set of subs during dinner and then when dancing starts, if I need the extra umph, I can turn the second set on.
I was reading a thread called,,,,do any dj's have an understanding of sound. April 27 2008. It is pretty good reading. If you have about an hour. I wish they could have seen this program run with the spl alleys and valleys! It might have changed some opinions.
I wonder what happens at the 27 foot apart mark. Like this thread is suggesting.
No .. in coupling, the 2 subs are placed with their mouths close to each other and the effect gains a few dbs of SPL for the listener.
In a cardioid setup, there are usually 2 or 3 subs and 1 of them is placed 180 degrees from the others (1 or 2 facing forward, 1 facing backwards). Then the rear facing one is delayed such that it helps cancel the bass frequencies traveling rearward and slightly reinforces the ones going forward (basically the phase is switched to offset the waves one way). This helps lessen the bass on stage (helps the musicians) and slightly increases it for the listeners. No need for a cardioid array for playback music only .. it's really a live sound need.
No .. in coupling, the 2 subs are placed with their mouths close to each other and the effect gains a few dbs of SPL for the listener.
In a cardioid setup, there are usually 2 or 3 subs and 1 of them is placed 180 degrees from the others (1 or 2 facing forward, 1 facing backwards). Then the rear facing one is delayed such that it helps cancel the bass frequencies traveling rearward and slightly reinforces the ones going forward (basically the phase is switched to offset the waves one way). This helps lessen the bass on stage (helps the musicians) and slightly increases it for the listeners. No need for a cardioid array for playback music only .. it's really a live sound need.
Next to each other to minimize phase or timing issues and to get the benefit. The effect will be heard more on horn loaded subs and less on direct firing ones. The bump is around 3db .. similar to what you get by pushing a sub back to a wall.
For me, I use the subs as a base for my tops (don't prefer the look of tripods) and don't run them near their limit, so the boost isn't necessary. If you look at the earlier charts, there are pluses and minuses for everything .. knowing what might happen helps in deciding the options you have.
