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<blockquote data-quote="helotaxi" data-source="post: 346979" data-attributes="member: 550915">Most subs will not accurately reproduce sounds above 120 Hz and you really want your crossover (low pass) set much lower than that.&nbsp; The human ear is not very good at localizing sounds lower than 80 Hz.&nbsp; Since your subs will most likely be installed behind your listening position in the car, if they are playing frequencies higher than 80 Hz it will sound like all the bass is coming from behind you.&nbsp; Ideally your front stage speakers should be able to extend to less than 80 Hz and overlap or at least meet your subs&#039; frequencies.If your amp only has two channels, you will need two amps to run all of your speakers if you plan on using the active crossover in your amp.&nbsp; One amp would be high pass and run your front speakers and the other would be low-pass and run your sub(s).&nbsp; The function of a crossover (high- or low-pass) works exactly as it sounds.&nbsp; A low-pass lets frequencies below the crossover frequency pass and attenuates frequencies above it at a specified rate i.e. 12dB per octave.&nbsp; What this means is that every octave (doubling of frequency) you move above the low pass point the sound is 12dB less.&nbsp; dB is not a linear scale and every 3dB equals a doubling of power, so at 12dB down (160 Hz for a 80 Hz crossover point) there is 1/8 the power being output.&nbsp; A high pass crossover works the same but lets the high frequencies pass.Maybe because there is low frequency musical information that his main speakers cannot reproduce?&nbsp; I don&#039;t really like &quot;booming&quot; bass either but would I ever build a system without a sub?&nbsp; Ummmmm, NO!&nbsp; I won&#039;t use a 15 or probably even a 12 and definitely won&#039;t be running 1 kW of power to it (them) but I will have a sub.</blockquote>

[QUOTE="helotaxi, post: 346979, member: 550915"] Most subs will not accurately reproduce sounds above 120 Hz and you really want your crossover (low pass) set much lower than that. The human ear is not very good at localizing sounds lower than 80 Hz. Since your subs will most likely be installed behind your listening position in the car, if they are playing frequencies higher than 80 Hz it will sound like all the bass is coming from behind you. Ideally your front stage speakers should be able to extend to less than 80 Hz and overlap or at least meet your subs' frequencies. If your amp only has two channels, you will need two amps to run all of your speakers if you plan on using the active crossover in your amp. One amp would be high pass and run your front speakers and the other would be low-pass and run your sub(s). The function of a crossover (high- or low-pass) works exactly as it sounds. A low-pass lets frequencies below the crossover frequency pass and attenuates frequencies above it at a specified rate i.e. 12dB per octave. What this means is that every octave (doubling of frequency) you move above the low pass point the sound is 12dB less. dB is not a linear scale and every 3dB equals a doubling of power, so at 12dB down (160 Hz for a 80 Hz crossover point) there is 1/8 the power being output. A high pass crossover works the same but lets the high frequencies pass. Maybe because there is low frequency musical information that his main speakers cannot reproduce? I don't really like "booming" bass either but would I ever build a system without a sub? Ummmmm, NO! I won't use a 15 or probably even a 12 and definitely won't be running 1 kW of power to it (them) but I will have a sub. [/QUOTE]

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