I have a subwoofer with a crossover frequency 50-150hz. Those frequencies below 30 Hz are the ones you FEEL rather than hear! So for example, are the main speakers really good down to 50 Hz or lower? Welcome to Sound Certified! A Large speaker will not -- the full range of frequencies in its audio channel will be sent to that speaker. I just upgraded to a bigger subwoofer, a JBL ES250P rated at 400 watts RMS and 700 watts peak power. If they are smaller, bookshelf style speakers there is of course no comparison. All three KS Series Active Subwoofers feature powerful DSP, which allow you to adjust a number of useful parameters. 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. This is a special channel reserved for carrying LOUD Bass -- definitely the sort of stuff you'd want to send to your Subwoofer! Need anything? 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. They simply can't move enough air to have a chance of handling Bass properly. If you try to push things too far -- say setting the Crossover at 50Hz in this example, trying to take a little more advantage of the "down to 30 Hz" goodness of your regular speakers -- you may bypass the low-end protection in the Crossover and send 25 Hz audio (or even lower) to that Subwoofer! 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". Instead, you are simply specifying whether or not you want Crossover processing to happen. There's no set definition of what constitutes Bass frequencies, but for purpose of discussion lets focus on frequencies below 150 Hz. Well what happens is that the natural reflections of the audio set up what are called "Standing Waves" of sound for each frequency. they may be rated only down to 80 Hz. NOW what? 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. When using multiple amplifiers or a multi-channel amplifier, you're going to want to choose a crossover point. The high‑pass filter only lets high‑frequency signals (for example, above 2kHz) through to feed the tweeter. I have 5 speakers with a frequency response from 120hz-23,000hz. That is, you can now "localize" the audio, in your mind, as coming from the direction of one of your speakers. 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. And what's the top end (and low end) the Subwoofer can handle? 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). Crossover. Picture in your mind the dimensions of your Home Theater viewing room: Front to Back, Side to Side, and Floor to Ceiling. So, if you DO have a range of Crossover Frequency candidates (after thinking through the upper and lower limit considerations described above), one of the best ways to choose between them is to pick the Crossover Frequency which MINIMIZES the inherent, Bass Room Response issues in your listening room! Or, of course, you could upgrade to better speakers! And these effects are not small! (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! "Fire Maidens of Outer Space" (1956) on Blu-ray -- The Point 'N Laugh Experience! Where they are exactly opposite of matching up you get "Cancellation Nulls" -- a loss of level of that Bass frequency. My choice in crossover for my receiver is 80, 100, or 120. Typically, a low-pass crossover is anywhere from 40Hz and could go up to 60Hz to 100Hz. So plan accordingly. And the challenge of Bass Management lies in taming these problematic, Bass Room Response issues. 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. A typical value for a 2-way crossover frequency is 2000-3000 Hz. But even if you have larger, "full range" speakers -- speakers with specifications saying they are good down to 30 Hz, or even lower -- you are not going to get the same quality of Bass out of them as from a well selected Subwoofer. If I am understanding this correctly, it is a borderline choice between 80 or 100. The concept of the subwoofer is based on the falsehood that you cannot directionalise bass below 80 Hz (some say 200 Hz). But Second, they want their Subwoofers to be ACCURATE -- to produce Bass of high quality. There ARE other ways of implementing Crossover, but we'll focus on this typical way. The highest frequency a subwoofer is capable of handling is the highest frequency you should use for the crossover settings. 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. A typical Crossover implementation will roll into effect at a rate of, "-12dB per octave". 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. These Subwoofers may be either Dynamic or Musical in design. The result isn't satisfactory because of the reported suckout around 80/90 Hz. Such setups do exist, but they are not what most people end up getting. The audio going to the regular speaker drops even more below 40 Hz, but by the time you are -12dB down, you can pretty much ignore the audio coming out of the regular speaker. I just upgraded to a bigger subwoofer, a JBL ES250P rated at 400 watts RMS and 700 watts peak power. Other features of crossover units In addition to frequency separation, crossover units can have other functions. 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. You can use my Contact page to send a message anytime. I mentioned up top using multiple Subwoofers (perhaps in lieu of one single, larger Subwoofer) could have additional advantages beyond simple convenience. This includes almost all of the lowest Bass notes from musical instruments. 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. Recent design trends are for power to be decreased to -6dB (1/4) to each speaker at the crossover point. The Dynamic Subwoofers are capable of much higher output for their size, but they aren't all that accurate. At least, it can do so if you make sure to only send frequencies to the Subwoofer which WORK THAT WAY! , we 'll be most concerned with in this effort get `` Resonance Peaks Cancellation! 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