If you have speakers already connected to your stereo, fully disconnect them.
 Active crossover units are larger than passive ones and need to be mounted in a stable location, ideally near your amplifiers.Do not mount your crossover directly to a metal rack, as this can cause buzzing and other sound problems.
 Using the appropriate cables, wire your crossover into the receiver or preamp, with the wires coming out of the receiver going into the "in" terminals on the crossover.


Depending on your receiver and your stereo system, you will probably be making this connection with RCA cables, but some crossovers will are set up to use speaker wire instead (as detailed in Method 1) if your receiver doesn't have RCA outputs.Crossovers designed for PA systems sometimes use quarter inch cables, like those used to plug in an electric guitar, or XLR cables, like those used to plug in a microphone., Using the appropriate cables (again, usually RCA or speaker wire for a home stereo system), connect the appropriate outputs to the appropriate amplifiers.


If you don't have a subwoofer, you'll send your high frequency signal to your tweeter amp and low-frequency signal to your woofer amp. In this case, make sure your crossover is set to two-way mode. There should be a switch that controls this. If you can't locate it, check your instruction manual.
Connect the left output of each frequency range to the left input of the coinciding amplifier and the right output of each frequency range to the right input of the coinciding amplifier.
 There are several ways to hook up a subwoofer to your system. Whichever you choose, you'll need to set up your crossover so that the mid-frequency signal is being sent to the woofers, but the low-frequency signal is not.One approach is to use additional cables from your crossover to your subwoofer (or subwoofer amplifier, if your subwoofer doesn't have it's own power). In this scenario, you'll set the crossover to three-way mode if you're connecting to separate woofers and tweeters, or the two-way mode if you are running the main speakers with a full-range signal and just sending the bass to the subwoofer.Another approach is to run cables directly from the subwoofer-out (sub out) terminals of your receiver. If you have a newer receiver, it may have its own crossover settings for a subwoofer, so you won't need to use an external crossover for this.If your receiver does not have subwoofer settings, your subwoofer itself most likely has a built-in crossover. These typically will not provide the optimum sound, but are easy and convenient, and also allow you to skip the external crossover unit.If you are hooking up your subwoofer to an external crossover, turn the subwoofer's built-in crossover to its maximum rotation to remove it from the circuit. Having multiple crossovers functioning at once can make the bass input uneven or erratic.Avoid connecting subwoofers with speaker wire. It doesn't handle bass signals as well as sturdier cables., Active crossovers require power to function. Home stereo and PA system crossovers usually just plug into an outlet, while car stereo units like the one shown in the video below need to be connected to the car's power supply through the fuse box or in some cases the amplifier will have a terminal for sending power to a crossover., At this stage, you'll want to fine-tune your system to get a sound you like. The manual for your crossover should have some tips for doing this, but you can also follow the guidelines below. At the beginning of the this process, make sure the input gain on your crossover is turned all the way down (if it has an input gain knob), set your amplifier gains low, and if you have an equalizer, turn it off or set the levels all flat.Turn on the system and play some music that you are familiar with. This way, you'll have a good sense of what you think the music is meant to sound like.
Slowly turn up the input gain on the crossover until sound comes out of all your speakers.
Adjust the level for each output on the crossover until the frequencies are playing at an equal volume. As every crossover model is different, you should consult your manual for details on how to do this, as well as the manufacturer's recommended settings.
One by one, turn up your amplifiers' gains until the music begins to distort a little, then roll them back to just below the distortion threshold. Readjust the crossover frequencies as necessary to restore balance between the frequencies.
Turn on your equalizer and begin making adjustments to the sound to suit your personal preferences. Make any adjustments you want on your receiver as well, e.g. the tone, etc. Again, readjust the crossover frequencies until the sound is balanced.
Keep fine tuning your adjustments on the receiver, equalizer, and crossover until you get a sound mix you like.
Unplug your speakers.
Mount the crossover.
Connect the crossover to your receiver.
Connect the crossover to your amplifiers.
Hook up your subwoofer, if you have one.
Connect the crossover's power and turn the unit on.
Tune your system.
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