So you set your Crossover at 60 Hz. If I am understanding this correctly, it is a borderline choice between 80 or 100. Home Theater Subwoofers have cone diameters in the range roughly 10-18 inches, and, equally important, they have power amps built in, dedicated solely to moving that big cone. THAT'S the reason it gets touted as a good starting point for your Crossover setting -- until you have time to think things through more carefully. Copyright 2018 BlackSkye Media LLC. First, they want their Subwoofers to be LOUD. Why? The concept of the subwoofer is based on the falsehood that you cannot directionalise bass below 80 Hz (some say 200 Hz). These Crossovers and PA Management devices are the most popular on the market currently. The numbers below highlight general guidelines for speaker/subwoofer crossover frequencies Should I set the subwoofer crossover at or near 60 Hz? That is to say, at 80 Hz and above, the regular speaker is carrying the audio. The PROBLEM derives from those Bass audio Standing Waves I described up top. they may be rated only down to 80 Hz. From 100 Hz at the high end down to twice the low frequency limit of the main speakers at the low end. Welcome to Sound Certified! If the width and depth of the room are different, positions close to the rear wall (near the TV screen) will couple differently than positions close to a side wall. It is best for low-end bass. This will ensure a smooth frequency response when the drivers are combined. Live Sound Reinforcement ... (To calculate how long an audio wave is, divide the speed of sound—1,130 ft./second—by the frequency. So the job of the Crossover is to "filter" the audio intended for each speaker so that the Bass frequencies are actually sent to the Subwoofer, and the remaining, higher frequencies go to that speaker. Visit my About page to read about who I am and what I do. And at these Bass frequencies, even INCHES make a significant difference in how a Bass speaker couples to the room! My HSU Research speakers are rated down to 60 Hz. My question is: Should I stick with the subwoofer's listed crossover frequency of 80 Hz when running sound for a rock band at a small outdoor venue? You can set a crossover for the other speakers (C and Surr). Limited range speakers are far more common than full range units. So the LOWER limit for the Crossover Frequency would be TWICE the bottom end of your regular speakers. And you'll recall from that table linked above, this is a "safe" frequency for Bass steering, since the wavelengths of audio 80 Hz and lower are going to be long enough to trigger that "pressurizing" effect -- i.e.,to be "non-localizable". Its actual frequency response is 25hz to 150hz. Console Main Outputs > Graphic EQs > Crossover. And THIS is where we start to run into the REAL complications of Bass Management! In other words, Crossovers allow you to connect subwoofers to your live sound rig. Positioning the speaker closer to a wall enhances reflections off that wall. -- experienced 60 Hz, power line interference hum, at one time or another. 3k Hz is the crossover point with 1/2 octave stable in either direction. When looking for the best audio crossover for your live sound rig, there is a few things to consider. If they are rated down to 50 Hz, the Crossover Frequency should be no lower than 100 Hz. A crossover unit takes the incoming audio spectrum signal, everything from 20 Hz to 20,000 Hz and splits it into two or more bands. If you use a crossover frequency much higher than 80 Hz, deep bass will start to be directional, so you risk hearing the subwoofer as a "source" of sound, which is what you want to avoid. A crossover unit enables you to get a great sound because you are giving the right frequencies to the right speakers so they can do the best job of creating the sound. And in between, they SHARE the job of reproducing the audio! The reason is that something called phase distortion generates around each filter's crossover frequency, muddying up the sound. Wavelength also works as you move away from the baffle so if the crossover frequency is set at 3000Hz and the drivers are placed further apart you will get lobeing if the midrange and tweeter drivers are more than 4.5 inches apart. If you have got them installed in the car for your already decent speakers, then setting the crossover frequencies is an even better option to get the most out of it. Without the loudspeaker crossover, a loudspeaker driver such as a tweeter can be overdriven which can lead to distortion and eventual failure. But there's an alternative. C-A also plays a role in sound exposure and noise pollution applications. This goes back to the concept of Bass frequencies "pressurizing" the entire volume of space in the listening room. Other features of crossover units In addition to frequency separation, crossover units can have other functions. A crossover is part of almost all live music sound reinforcement systems. Indeed, you can pretty much be guaranteed:  Unless your main speakers EACH have to be plugged into wall power, there's pretty much no chance they can handle bass as well as a Subwoofer. The range of frequencies a speaker will reproduce (lowest to highest) is in many cases limited. A good starting place is with the high-pass filters on the front and rear channels set at 100 Hz, and the subwoofer channel's low-pass filter also set at 100 Hz. Why? You can use my Contact page to send a message anytime. Fortunately, Crossover processors let you specify which Bass frequency range you want steered to the Subwoofer. The thing to know is, the choice here has NOTHING TO DO with the physical size of your speakers! All rights reserved. Those new frequency bands are then sent to different loudspeaker drive units that are created specifically for those frequencies. And we know we have to compare those candidates against what our gear can actually handle. So the LOWER limit for the Crossover Frequency would be TWICE the bottom end of your regular speakers. Bass Control computes the best possible results for the crossover frequency that is assigned by default but the user has to choose it... so that some experimentation is possible and in some cases necessary. Start by figuring out what you can afford and then determine what sounds best to you within that price range. And most of us have -- alas! Where the different Standing Waves happen to match up you get "Resonance Peaks" -- a boost in level of that Bass frequency. A common, pseudo-technical description of Bass audio constrained inside a room like this is that the Bass audio "pressurizes" the entire volume of the listening room. 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