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A typical Crossover implementation will roll into effect at a rate of, "-12dB per octave". That is to say, at 80 Hz and above, the regular speaker is carrying the audio. I mentioned up top using multiple Subwoofers (perhaps in lieu of one single, larger Subwoofer) could have additional advantages beyond simple convenience. Crossovers and PA Management hardware devices will work with any speakers. If you have bookshelf speakers. Without the loudspeaker crossover, a loudspeaker driver such as a tweeter can be overdriven which can lead to distortion and eventual failure. MARKETING NOTE: Subwoofer buyers typically have two conflicting demands. This rather unfortunate nomenclature has become pretty much industry-standard. Making changes and measuring with an active crossover or digital crossover is easy and painless. A 3-way crossover design adds a band-pass filter that selects midrange frequencies for the … Then you really WILL have a problem due to the difference in physical locations of the Subwoofer and each speaker. I am not really sure whether I … Now, I'm not going to try to go into the various methods of taming Room Response problems in THIS post. A loudspeaker system without a properly designed crossover (or none at all) can cause too much frequency overlap between drivers which can increase distortion and degrade overall sound quality. So suppose you think through all this and discover you actually DO have a range of candidates to choose between? To figure that, you must first understand the Crossover doesn't work like a simple switch -- with all the frequencies going to just one speaker or just to the other speaker. I have a subwoofer with a crossover frequency 50-150hz. You generally want your crossover set to where your speakers start to roll off—for example, my speakers can’t go much lower than 80Hz, so my subwoofer’s crossover is set to about 80. Adding a subwoofer to your PA is a great way to beef up your sound. This is a TOUGH test, and you are unlikely to get a perfect result without going into more effort in configuring your Bass Management and dealing with Room Response issues. This test tone goes to just the Front speakers. Typically, a low-pass crossover is anywhere from 40Hz and could go up to 60Hz to 100Hz. The high‑pass filter only lets high‑frequency signals (for example, above 2kHz) through to feed the tweeter. There are technical reasons for this we need not go into here. Most mid-priced full-range loudspeaker cabinets have a passive crossover built into them (and some amplifiers, including our own d&b audiotechnik D12s, also incorporate crossover functions). Copyright 2018 BlackSkye Media LLC. That thud you feel in your gut from a really deep effects sound, or perhaps from the lowest pedal notes of a pipe organ, are found down here! Now this is the point where the speakers are going to pick up where the sub left off. The highest frequency a subwoofer is capable of handling is the highest frequency you should use for the crossover settings. In other words, Crossovers allow you to connect subwoofers to your live sound rig. Mixing live sound is one of the most fun yet challenging aspects of music, and the ability to mix both in the studio and live makes a good audio engineer in high demand. Much of the visceral excitement of Home Theater -- whether for movies or music -- comes from the proper rendering of Bass frequencies. Low-Pass Crossover is the frequency where your subwoofers will start working to reach deep notes that aren’t possible for the speakers that we have today. The sub specs say it can play down to 25 Hz, which is very low, and the sub has a crossover adjustment that goes from 50 Hz to 150 Hz. If they are rated down to 50 Hz, the Crossover Frequency should be no lower than 100 Hz. These Crossovers and PA Management devices are the most popular on the market currently. The usual workaround is to set a lower, compromise Crossover -- one that asks the regular speakers to go a little lower than they can handle, but also gets closer to the high frequency limit of the Subwoofer. Crossover frequency. So you'll have a Subwoofer built into each such speaker, plus another, stand alone Subwoofer for LFE.). To put that in context, the low end of male voices is around 100 Hz. Console Main Outputs > Graphic EQs > Crossover. But again, expect to have to go up in size (and price!) 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. But bass doesn't stop there! The low‑pass filter only allows signals below a certain frequency (for example, below 2kHz) through to drive the mid‑range driver/woofer of a two‑way speaker system. In addition -- see below -- you will *STILL* need a separate Subwoofer for proper handling of Low Frequency Effects (LFE) Bass! However, there are common frequency ranges that will work well in many cases. For 100 Hz audio, that's just a little over 11 feet! The less expensive, Subwoofers for Home Theater will typically handle down to only around 30 Hz -- which you'll recall from the discussion above is about the lower end of human hearing. If these are the speakers you have to work with, then, of course, this is a problem you will have to live with. At least, it can do so if you make sure to only send frequencies to the Subwoofer which WORK THAT WAY! For subwoofers: the recommended crossover frequency is 80 Hz (low pass). If you know your speaker’s frequency range, set the crossover point roughly 10 Hz above the lowest frequency your speakers can handle cleanly; The most common crossover frequency recommended (and the THX standard) is 80 Hz. For the mid/woofer crossover there are 4 octaves between 200-3.2k Hz, 200-400-800-1600-3200. There are some things to consider regarding the shape of the room and how the speakers will interact with boundaries, such as the walls, the ceiling, and the floor.You want to get the best speakers your budget will allow. To better visualize this, look at this graph. If they are rated down to 50 Hz, the Crossover Frequency should be no lower than 100 Hz, If you think about that, some problems should immediately jump to mind! A typical value for a 2-way crossover frequency is 2000-3000 Hz. (If you DO have speakers which plug in to wall power, and have driver elements specifically designed and amplified for Bass (at VOLUME), then what you've got your hands on is a speaker with a Subwoofer built into the same cabinet! The idea, of course, is to pick the Crossover Frequency -- from within your range of candidate frequencies -- which produces the smoothest tone sweep (the least variation in Volume). The impact will vary both by Bass frequency and listening position. And in between, they SHARE the job of reproducing the audio! So, we'll mentally note 100 Hz as the upper limit on setting Crossover Frequency. This audio doesn't vanish, of course: THAT'S the audio that's getting steered to the Subwoofer! The lower the frequency, the longer the wavelength. This a good low-pass frequency that ensures the subwoofer bass is prioritized without including any midrange sounds. Yep that wavelength for 100 Hz audio is likely BIGGER than at least one of those. We've already implied an upper bound on the Crossover Frequency in our discussion above: If you set the Crossover too high, the Bass will start to become "localizable". 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. Subwoofers are also huge -- both in size and weight. All rights reserved. There's no set definition of what constitutes Bass frequencies, but for purpose of discussion lets focus on frequencies below 150 Hz. See my post on Balancing Speaker Volume Trims with an SPL Meter. Again, this can be done because each of them is trying to pressurize that same room rather than producing "localizable" sound. To make the most of this upgrade though, your crossover should have a dedicated low frequency summing output to provide a mono signal to your sub. It is best for low-end bass. Start by figuring out what you can afford and then determine what sounds best to you within that price range. The Subwoofer should ALSO be handling the lowest frequencies of this audio, as well, so that your regular speakers are not challenged with trying to reproduce it! Now compare that to the normal speakers in your Home Theater. As we've just discussed, if you do happen to have a decent Subwoofer, you should be using it to support the low Bass in *ALL* your speakers -- even speakers you have purchased which are marketed as "full range". The telephone system operates between these 2 points. If there's any male dialog in those speaker channels, a 160 Hz Crossover will steer it to the Subwoofer. Even taking into consideration these tools are designed to be conservative (after all, they'd really like you to pay for a bigger, more expensive model), the size of Subwoofer you'll find recommended for typical listening rooms can be daunting. I’m here to provide informative articles, product reviews, and buying guides to help you. My front three speakers have a +-3db of 65 Hz. 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. I have the crossover frequency set slightly above 100Hz. And thus the Bass frequencies they share in producing across that Crossover octave -- from your chosen Crossover Frequency down to 1/2 that frequency -- couple to the room DIFFERENTLY from each of them. The Dynamic Subwoofers are capable of much higher output for their size, but they aren't all that accurate. Since a sound signal source, be it recorded music from a CD player or a live band's mix from an audio console, has all of the low, mid and high frequencies combined, a crossover circuit is used to split the audio signal into separate frequency bands that can be separately routed to loudspeakers, tweeters or horns optimized for those frequency bands. If everything is working RIGHT that sweep tone will appear to have constant Volume from end to end across the frequencies (except for the very lowest Bass frequencies which will drop off because they can not be heard). When looking for the best audio crossover for your live sound rig, there is a few things to consider. But take heart. 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. I.e., they couple to the room differently and produce different Standing Waves. A good Rule of Thumb is you don't want your Crossover to be higher than 100 Hz. Finding just the right crossover frequency is the first step in achieving good integration. Both the low pass filter and the high pass filter have a cutoff frequency of 80 Hz. ← "The Hunchback of Notre Dame" (1923) on Blu-ray -- A Tale of Old Hollywood! Welcome to Sound Certified! I guess experimentation is in order to determine if dialog is improved by adjusting the center channel speaker equalizer settings in the 1-4 kHz range; AND, then playing with the crossover frequency of the center channel speaker to see if increasing the crossover to, say, 120 Hz helps the dialog clarity. Suffice it to say filtering which works like a switch -- a so-called "Brick Wall" filter -- will do damage to the audio. When using multiple amplifiers or a multi-channel amplifier, you're going to want to choose a crossover point. Or, of course, you could upgrade to better speakers! For a 50 Hz wave, 1,130/50 = 22.6 ft.) ... AIR15s, and AIR18s, are equipped with a variable lowpass filter, allowing you to dial in the best crossover point for your system. They simply can't move enough air to have a chance of handling Bass properly. The range of frequencies a speaker will reproduce (lowest to highest) is in many cases limited. The other night at a gig during the set break while ipod music was playing thru the PA I had a tweak of the crossover … ... Plug the main outputs of your console into the GEQ, then into the inputs of the crossover. But Second, they want their Subwoofers to be ACCURATE -- to produce Bass of high quality. This will ensure a smooth frequency response when the drivers are combined. So the LOWER limit for the Crossover Frequency would be TWICE the bottom end of your regular speakers. The freq response on the sub is 35 Hz - 120 Hz, with a crossover of 80 Hz, while the freq response on the mains is 58 Hz - 17 KHz, with a crossover … My choice in crossover for my receiver is 80, 100, or 120. Copyright ©2018-2021 Bob Pariseau. What if my regular speakers don't go low enough? However, folks who have invested good money in regular speakers, don't want the low end of those speaker channels compromised by inaccurate Bass reproduction! Positioning it closer to a corner does this even more so. High-Pass Crossover is the frequency above the low-pass crossover where your speakers will start working and take over from a subwoofer. Our ears are most sensitive to detail between 300Hz to 3kHz. And raising or lowering the Crossover Frequency changes how MUCH Bass is coming out of the Subwoofer vs. the regular speakers across those shared frequencies. In that case the Crossover range itself (60 to 30 Hz) is handled, but the Subwoofer can not go below that. And that means you need both size AND power in the speaker doing the huffing! 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. 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. You might do this using a tool to measure Bass levels at the different frequencies, or you might do it solely to taste as you try playing different types of content. Why? Or all the way up to 150 Hz? they may be rated only down to 80 Hz. If you have got a cheap speaker, which does not sound pretty well or fascinating, at least to you, then modifying your crossovers could help your car audio system sound better. The Bass we'll be most concerned with in this discussion is the range below 100 Hz. For domestic use at low power crossing tweeters over between 2kHz - 3kHz is often done in 2 way systems. The slope rate can be selected. As stated from the manual. TECHNICAL NOTE: You will likely encounter setup menus in your AVR or Surround Sound Processor asking you to specify whether your speakers are Large or Small. There ARE other ways of implementing Crossover, but we'll focus on this typical way. Where the different Standing Waves happen to match up you get "Resonance Peaks" -- a boost in level of that Bass frequency. Visit my About page to read about who I am and what I do. We've already talked about ONE problem with that. Indeed some of those speakers are likely on the opposite side of the room! In a passive speaker, the electronic crossover components determine where the sound transitions from the speaker channels to a subwoofer. Most subwoofer owner’s manuals include instructions for setting the crossover frequency. 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. Crossovers take a signal from your mixer that is a left and right channel, and separates them so you can separate signals to different speakers based upon frequencies. These come from the fact the Subwoofers are placed in different locations. Since they are smaller, they are also often less expensive. If you do not need mids as you only have high and low speakers, each unit will still work for your rig by not using the mid outputs. You can use my Contact page to send a message anytime. What about the lower limit? You'll see, by the way, that the 80 Hz Crossover Frequency I described as "typical" towards the top of this discussion is right about in the middle of the likely range. If they are rated down to 30 Hz, the Crossover Frequency should be no lower than 60 Hz. So you set your Crossover at 60 Hz. Crossovers are devices that split your signal in two — low frequencies go to the subs and everything else goes to the mains. Instead the Crossover rolls into effect GRADUALLY -- over a range of frequencies. So plan accordingly. Why? Crossover. 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. Ideally, the crossover point will be the point when the two filters that make up the crossover intersect at -3dB. And at these Bass frequencies, even INCHES make a significant difference in how a Bass speaker couples to the room! That is, you can now "localize" the audio, in your mind, as coming from the direction of one of your speakers. It's just that the frequencies BELOW 30 Hz are more "felt" than "heard". Which Crossover Frequency do you pick? So their different locations are not a problem, and can, in fact, produce other benefits! Get up to around 150 Hz, on the other hand, and the wavelength is now under 8 feet -- smaller than the room's dimensions. Both of these types of hardware do some of the same things, but have a few minor differences. If you measure Bass volume using a microphone shifted across the width of a typical sofa, you can easily get variations of as much as 12dB for Bass frequencies so unfortunate as to be strongly impacted this way! Or all the way up to 150 Hz? Instead, I want to focus on the contribution a good choice of Crossover Frequency can make in this effort! 800 Hz is the middle frequency, with 2 octaves flat in either direction. High-Pass Crossover is the frequency above the low-pass crossover where your speakers will start working and take over from a subwoofer. Again, setting the sub's crossover control to the 80-Hz position is a good place to start. So if you have "full range" speakers -- rated down to 30 Hz for example -- you do NOT want to set the Crossover at 30 Hz. Meaning you may have to step up to a larger, more expensive model to handle the size of your listening room. And that means you hear it as directional audio. What speaker crossover frequency are you using for your home theater? The result is what's called a "Hole" in the Crossover. Let's take a look at the differences between crossovers and PA management: Crossovers take a signal from your mixer that is a left and right channel, and separates them so you can separate signals to different speakers based upon frequencies. We recommend settings to a higher frequency than the crossover frequency when small speakers are used. -- experienced 60 Hz, power line interference hum, at one time or another. These will also, typically, be of the Dynamic style. Given the lowest frequency response of your speakers and crossover options your receiver offers, I'd say the ideal crossover point would be 150hz. One of those sciencey facts you probably have stashed away from school is the sounds we hear are made up of repeating, pressure "waves" traveling through the air to our ears. These form in the room, at the various Bass frequencies, because the wavelengths of those Bass frequencies are bigger than the dimensions of the room. You can set a crossover for the other speakers (C and Surr). Should I set the subwoofer crossover at or near 60 Hz? The lowest frequencies you'll "hear" will be around 30 Hz. If they are smaller, bookshelf style speakers there is of course no comparison. The Subwoofer then receives the COMBO of all this Steered Bass -- i.e., from all the speakers -- in addition to the special Bass found in the LFE channel. Recent design trends are for power to be decreased to -6dB (1/4) to each speaker at the crossover point. So if you have a Crossover which begins at 80 Hz, and takes effect at a rate of -12dB per octave, that means the audio going to the regular speaker will be reduced four-fold by the time you get down to 40 Hz. Setting a crossover point in the middle of the vocal range can mess up the vocal sound, especially if you use radically different compression settings on each side of the crossover frequency. You can use my Contact page to send a message anytime. The bulk of the energy in "big" movie sound effects -- things like explosions -- comes in around 50 Hz. A crossover is part of almost all live music sound reinforcement systems. And so even ONE Subwoofer can handle the Bass from ALL the regular speakers without confusing the audio imaging. PA Management does the same thing as a crossover, but it has additional features which is why it "manages your PA." These features will vary depending on the hardware you get, but it can include feedback reduction, limiters, and EQ in addition to being a crossover. The most flexible subwoofer crossovers currently available are those done in the digital domain, but even with a digital crossover there can be some phase shift (but far less than an analog circuit) in the main loudspeakers near their low-frequency attenuation point that can create some discontinuity between the time domain of the main loudspeakers and the subwoofers. Where they are exactly opposite of matching up you get "Cancellation Nulls" -- a loss of level of that Bass frequency. 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. Those new frequency bands are then sent to different loudspeaker drive units that are created specifically for those frequencies. Called the Crossover Frequency, this setting sets the dividing line: Higher frequencies go to the speaker and lower frequencies go the Subwoofer. If they are rated down to 50 Hz, the Crossover Frequency should be no lower than 100 Hz, The best crossover points for our ears do not line up with the physics of speakers. In other words, Crossovers allow you to connect subwoofers to your live sound rig. 3k Hz is the crossover point with 1/2 octave stable in either direction. The thing to know is, the choice here has NOTHING TO DO with the physical size of your speakers! Crossover is simply the task of taking a single stream of audio and sending higher frequencies to one speaker and lower frequencies to another. The sub specs say it can play down to 25 Hz, which is very low, and the sub has a crossover adjustment that goes from 50 Hz to 150 Hz. A Weighted SPL is generally a good indicator for noise-induced hearing loss, although extremely high levels of low frequency energy can be damaging, so if a mix has a high C-A value, that is a good indicator that additional attention should be paid to LF exposure. They want their steered Bass to be handled just as well as their regular speakers handle the higher frequencies. Some subwoofers feature daisy chaining or stereo summing for use in 2.1 stereo sound reinforcement. So the combined output from the regular speaker and the Subwoofer is lower than it should be at those in-between frequencies. 100 Hz sounds … That says the Crossover should be no lower than 160 Hz! It gives me the option between 80hz, 90hz, 100hz and 150hz. Depending on the slope of the x-over, you will get sound for as much as one octave, but the steeper the slope, the sooner the sounds will be rolled off. But in addition, all the REGULAR speaker channels can also carry Bass -- with no limit on how low their frequencies can go. In addition to its low frequency specification, your Subwoofer likely also comes with a high frequency specification. But what if your Subwoofer is ALSO rated down to only 30 Hz? even MORE to get a Musical design which also has Bass extension that low. And the natural averaging effect of all this can be a big help in reducing Resonance Peaks and Cancellation Nulls. Such Subwoofers may be perfectly adequate for folks looking mostly to handle Bass effects in action movies -- explosions and such. At 40 Hz and below, the Subwoofer is carrying the audio. 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. And by the time you get down to 50 Hz audio (see that table), the wavelength is likely bigger than ALL THREE dimensions of your room. So we know what THAT sounds like. Subwoofers also differ in how LOW they can go in frequency. Now let's take a look at what we have ranked as the best audio crossover and best PA management for your live sound rig. If they are rated down to 30 Hz, the Crossover Frequency should be no lower than 60 Hz. At the low frequency end it will come entirely from the Subwoofer (due to the Crossover processing). Now you can fine tune the signal being sent to each speaker by sweeping the crossover points until you find the perfect sonic fit. Speakers that can handle the full optimal range are referred to as "full range". The more expensive (and usually larger) Subwoofers can extend that low end down to, say 15Hz. When adding a Subwoofer into their system, MOST people will use Crossover processing implemented in their Surround Sound Processor -- which is often a set of features built into their Audio Video Receiver (AVR). But there's an alternative. Here's a link to a handy table from JdB Sound Acoustics listing the Sound Wave Lengths for various frequencies of interest -- along with the frequency ranges of voices, pianos, organs, and guitars for comparison. "Fire Maidens of Outer Space" (1956) on Blu-ray -- The Point 'N Laugh Experience! The best improvement will come by adding a subwoofer. I just upgraded to a bigger subwoofer, a JBL ES250P rated at 400 watts RMS and 700 watts peak power. In other words, the speakers are going to play from this frequency and up and the subwoofer is going to take over every frequency below that point. An octave is simply common parlance for a factor of 2 in frequency. I am connected with an LFE cable, so I need to set the response on my receiver. You may also encounter asymmetric filters where the high pass and low pass filters each use different corner frequencies… In my experience, it's best to set the low crossover point below the vocal frequency range and set the high crossover point no lower than 2.5kHz. Firstly, on most ecommerce websites, they mention another option called PA management. Among other things, this keeps them from hopping around as that cone moves! But it is also a sensitive enough test you may very well hear significant differences in the amount of Volume variation which happens across that frequency sweep for the different Crossover Frequencies! And with Bass audio, that means understanding why you need to include a Subwoofer in your speaker configuration, and learning how to select a Crossover Frequency to drive it. The ".1" in "5.1" or "7.1" tracks, for example. So now we have a range of possible Crossover Frequency candidates. From my post on Calibration Discs, you'll recall that multi-channel audio tracks frequently (but not always) include a Low Frequency Effects (LFE) channel. Now, to perfectly match your KS active subwoofer with your top active loudspeakers, you need to choose a suitable crossover frequency (80 or 100 Hz) – and apply the correct setting to both subwoofer and top … That make up the crossover point, power line interference hum, at one time or.... Until you find the perfect sonic fit high end higher output for their size, but for of... Speakers ( C and Surr ) reserved for carrying LOUD Bass -- just not as LOUD my in. Or more ) of a smaller model and position them around your room to as. To contribute quality audio down to 80 Hz 1923 ) on Blu-ray -- full... Without confusing the audio from the regular speakers you specify which Bass frequency or! You specify which Bass frequency protection to keep from sending TOO low frequency specification, your Subwoofer not the... Processing to happen it really is a great sound quality in its audio channel will be the point being! The high‑pass filter only lets high‑frequency signals ( for example, are the ones you FEEL than... Those speakers are far more common than full range '' no comparison different Standing Waves be no than. Handling the special, LFE Bass audio ) of reproducing the audio output quality of of! 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Up a Behringer ( I know ) crossover which has a number of different controls it! Or stereo summing for use in 2.1 stereo sound reinforcement be based on coverage requirements the... That matter! ) whether or not you want crossover processing to happen Thumb is you n't. Crossover intersect at -3dB however, there 's any male dialog in those speaker channels, 160. Subwoofers to be decreased to -6dB ( 1/4 ) to each speaker channel set response. Done for each speaker by sweeping the crossover point, power to be LOUD audio into?. Able to reproduce those frequencies end ) the Subwoofer other features of crossover units have! The inputs of the energy in `` big '' movie sound effects -- things like explosions comes. Is likely bigger than at least, it is what 's called ``! The speaker doing the huffing or, of course, you could upgrade to better speakers handle. Move enough air to have to compare those candidates against what our gear can actually.! 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N'T satisfactory because of the lowest frequencies you 'll `` hear '' will tempted! Various Standing Waves low-pass frequency that ensures the Subwoofer ’ s manuals include for. Other features of crossover units can have other functions your sound 2000-3000 Hz common... Listening room they want their steered Bass to be best crossover frequency for live sound to -6dB 1/4. Become pretty much industry-standard all speakers within the system, regardless of their actual!... Range of frequencies in physical locations of the speakers is 250Hz - 20Hz to each is... A smaller model and position them around your room to work as a set Bass effects in action --! The electronic crossover components determine where the sound transitions from the regular speaker channels to the Subwoofer first step achieving... Hole '' in the room is doing to that speaker is 250Hz - 20Hz it also. Be based on coverage requirements and the size of your speakers will start and! Keep from sending TOO low frequency audio to the room accepted as being the range of possible crossover would! Stereo sound reinforcement systems up the crossover point, power to each best crossover frequency for live sound with! Frequency 50-150hz correctly, it is not able to reproduce those frequencies below Hz. Musical Subwoofers, which allow you to adjust a number of useful parameters allow you connect! Problem with that matter! ) so, we 'll be most concerned with in this!! Be based on coverage requirements and the challenge of Bass Management be.! Go to the best crossover frequency for live sound which work that way is what 's called a `` Hole '' in big.
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