I have a question that I can't find the answer to. I have 4 subs and I want to know if, by placing them in front of the stage with a distance of 1.7m between them, do I need to apply delay between each sub and the PA?
Hi Michael, quick question: Most videos concerning ringing out rooms, setting up PAs etc. don't even bother about phase. Therefore I'm wondering: Is phase something that is set up in the DSP once for a PA system or does one have to check it every time when you change the venue and move speakers?
In what aspect are you asking about phase? The phase relationship between two different types of speakers? Mains and subs? Trying to get a flatter phase response from a speaker? Time alignmennt?
@@MichaelCurtisAudio mains and subs. Time alignment is something you can estimate based on the distance in meters or ms. But will the phase change in different rooms?
Hi, would you be ok for L/R subs, if they 2 stacked on each other and made cardioid, and if better angled or kept straight. I know your best configuration for 4 subs, but when in front of stage is no place for subs. What you would chose L/R cardioid, or try in front of stage 3 subs in cardioid mode(but no fences for gap people to stay safe distance), or all 4 in one side of stage? And just for fun, if L/R is cardioid and would it be possible then one smaller or quieter cardioid subs in center, for fill, or it would be disaster for alleys and valleys? Thanks from Lithuania, very happy for content, I am listening each video few times to soak it in.
Thanks for the question! I think the best setup here if you couldn't put all four subs in the middle would be to do a two-element cardioid setup LR, then angle them out 45°. You could do a center fill system and turn it down, but if you're able to get a center fill system going, then I'd just use that real estate to do your whole sub array there.
Hi Michael Great resource!😊👍huge help Thank you! I was wondering if two cardoid subs should be placed directly next to each other or does this reduce the reduction behind the subs? We have two Qsc ks212c's. If they are to be spaced how would i work that out? Kind regards
Great question, Mark. Placing two natively cardioid subs next to each other would still get you plenty of rejection in the rear. I'd only start to pull them apart only if I need to narrow the coverage pattern for a long, skinny room. And even then I'd only pull them a max of 5ft feet apart.
I have an outdoor movie theater, w/ one center sub on the stage,2stereo speaker's on the tower's that support the 150"screen,and two "top" speaker's from the sub ,high pass on stand's either side of the screen tower's .(far left of and far right of.)..My issue is the height of the speaker's . The last row is about 55 ft. to the very back , front row is about 14. if I aim for the center,I would need to raise the speaker's another 2 ft. or 6.5 ft. off the ground.right now,there 3.5 ft. off the ground .Ithink there to much in the front.
Hello. What is the optimal distance between the basses so that cancellations do not occur below 80 Hz. My installation doesn't allow me to keep the basses together, even though I know that's the best way. If you can simulate, help me, what is the best distance between the subwoofers so as not to have cancellations below 80 hz! and one more question. please, should the same crossover be applied to the front fill speakers as to the main speakers? Thank you very much and greetings from Romania
Hey, Adi. Unfortunately if you pull your subs farther apart than 7ft or so you will inevitably get peaks and cancellations below 80Hz. There's no way around it - correlated displaced sources arriving at the same spot at different times produce comb filtering. It's not the end of the world, but just something to be aware of. As far as crossover for front fills, yes I use the same crossover frequency as the mains, then use low and high shelves to adjust the overall tonality to my target trace.
If you invert the phase of one of the subs, doesn't the energy swap to sent your alleys and valleys to the side and your summed in the driver direction? That is how antenna phasing works 😎
In this specific case with subs spaced far apart, inverting the polarity one of the subs would just shift the pattern of where the power alleys and valleys are happening. They would still be happening in the middle, not to the sides of the boxes.
@@MichaelCurtisAudio great to know. Does the simulation software allow you to change one speaker? In my specific case, we are also dealing with side walls 15feet away from each sub, the 30feet in between, and 4 suspended main speakers 20 feet ahead and above the subs.
