For example, in the image above we can see that the tweeter has a usable frequency range of 3.5kiloHertz (kHz) and above. Sometimes this is clearly stated as the recommended cutoff while other times you’ll have to base it off of a speaker’s frequency response information. Manufacturers often include specifications that will tell you the cutoff frequency to use. It can be confusing at first but once you get a bit of experience with speakers it becomes a little bit easier thank goodness! In the sections below I’ll simplify the HPF frequency you should use for each case as well as provide some notes to help explain why it matters. What should I set my high pass filter to? Bass frequencies require a large speaker cone to produce that range of sound which isn’t possible with the tiny cone or dome they have. It causes distortion and can even damage them permanently if driven hard enough. They can’t handle the frequency range of some musical content like bass notes. Similar can be said for many types of midrange speakers as well. When it comes to tweeters, it’s especially critical to prevent them from being driven with low bass frequencies. Preventing bass from reaching small or rear surround home stereo speakers that can’t produce deep bass.Bi-amping: removing a passive crossover (speaker crossover) to drive the speakers directly from amplifier channels one speaker per channel.This is helpful when using a powered subwoofer alongside your main speakers to avoid having too much bass. For a home audio system where you’re using a subwoofer and would like to prevent excessive bass.In a car audio system where you’d like more volume & clarity from small speakers, preventing distortion & “bottoming out” due to heavy bass they can’t produce well.You’re using tweeters without a crossover or the included crossover isn’t good enough (see the crossover slope section below for more info).High pass filters are extremely helpful in some cases and more of a “nice to have” option in others – it depends on your particular speaker system.īasically, you should use a high pass filter when: Note: You’ll sometimes see the word “crossover” written as “Xover” as a shorter version of the name. Speaker crossovers do the same thing but they use capacitors and inductors instead of electronic circuits to accomplish this. This is true for crossovers built into a home receiver, home or car amplifier, or a modern car stereo. A low pass crossover is typically used for subwoofers but can also be used with a higher frequency setting for 2-way speaker settings to block treble to a woofer or as part of a 3-way system as well. Likewise, a low pass filter (LPF) blocks high frequency sounds above the cutoff frequency. Everything above the crossover point will be allowed to pass. High pass filter vs low pass filter differencesĪ highpass filter (HPF) works to block unwanted frequencies in the audio signal output (low frequency sounds) below the crossover point from reaching a speaker. What is a low pass (LPF) or high pass (HPF) filter?
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