Simple Cardioid Sub Setup 

I do exactly this setup for a regular stage of mine (30 shows a year) - outdoor with open-bottom stage. Except I do the "end-fire" version, so the delay is on the front-facing subs. That gives a more accurate sub sound out front, but less cancellation behind. The amount of sub that still happens on stage is extremely low, once a band is up & running you don't notice it at all (subs are flush with front of stage because the dance floor is directly in front of it, I put one K12 facing forward tilted back on the center sub as a center-fill for the dance-floor and one on each side sub as front-center monitors, freeing up some stage space). It's not as clean as something purpose-built like the Next subs, but for moving air without rattling the stage it's a great compromise!

This is so great. Clear explanation and demonstration.

Thanks. I checked a couple of websites and videos and it was all about fancy formulas. Now this is the most hands-on thing that makes sense and I will try this for my next sound reinforcement situation. Note that some subs have a cardoid system built-in, there's some by QSC, and the d&b y series subs do have it. However, the method in your video should work with any less-expensive subs, given you have 3 of them that are the same.

This makes a lot of sense to me. A couple weeks ago I was performing in an outdoor stage and I noticed there was a lot of bass on the stage. musicians were having a hard time hearing and there was some low frequency feedback occurring. Having a cardioid sub with its polarity inverted would help reduce that low-end on stage.

Reverse polarity just wastes energy. Think about it. If you had one subwoofer facing forwards and one backwards then your arrangement is effectively the same from front and back. It will still sort of work but you will have a configuration that is quieter than two subs at the front and quieter than one sub at the back. You are supposed to delay the front firing subwoofers by about 4 milliseconds and place the front firing subwoofers about 4.5 feet ahead (closer to the audience). That means all cones are in phase at all frequencies in front of the subwoofer array (the rear firing subwoofer radiates soundwaves and the wave reaches about 4.5 feet out behind it right as the front firing subwoofers start generating the wave.) From behind the subwoofers, a sound of 62.5Hz is cancelled by a half wave because the sound of the audience facing subwoofers arrives a whole 8 milliseconds behind the stage facing subwoofer. I'm assuming the 2:1 ratio of subwoofers is because a subwoofer cabinet has some slight directivity of its own such that outdoors it is 3-6 dB quieter behind it than in front of it.

if you have enough space somewhere you can make any space anechoic by using a linear sweep as a frequency response measurement, followed along by a band pass filter which filters all of the reflecting noise. It looks neat this way, and anyone can do it :)

Never knew about this, I'm gonna give it a try! Thanks for the video

Even flipping my single 18 at the wall and timing it with my dual 15 mains makes a huge difference. Difference between shaking your vision with bass or not

Have you put EQ on rear fire and boost and cut different frequencies. Wonder if you boosted at lowest frequencies that build up on stage since two fronts would be louder and summing to the rear if you could get more drop to rear and more out front.

THANX FOR THE VIDEO... LEARNED A LOT!

I’m curious about this. I have 2 - KW 181s. My mixing board does not have the capability to delay the signal. I have two questions I guess. 1. What is the cheapest way to create a delay? For instance is there an affordable rack mount or simple in-line box that could be edit? 2. Wouldn’t keeping all the polarities the same and delaying the front firing speakers accomplish the same effect?

Where do u learn this kind of staffs

*S C I E N C E*

How would three Integrity 24" woofers do (one facing rear)? They handle 2000 w rms so I need like three Crown XLS amplifiers. This would be for an outdoor system of course. I originally purchased four 15" Earthquake subs 1200 w rms with two XLS2502. If I have an outdoor concert, the band needs to be "happy" with the sound setup.

nice video so you gotta use 2 microphones and see in protools wow nice and easy .. So delay the front sub and call it a day

Can you explain the wiring (rigs), and loops?

If you revers the polarity and the box wouldnt it be the same throw as the ones conected right and turned fowerd??

Soundya luar biasa

Are u suppose to reverse the polarity? Isnt it reversed ready when d sub faces backward

I need your help. I have 8 yamaha DSR18 subwoofers. I want to set them up in a cardioid aray. Also for DSP I'm using DBX driverack vue360. Can you help. Thanks in advances for your time.

Can you do the same with 6 subs?

How does that gld working for you?

vip.

what console is that used in this video?

How is patching?