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<blockquote data-quote="thch" data-source="post: 2222566" data-attributes="member: 562032">depending on the frequencies and power in question, you might find that the inductor+capacitor costs, probably around $30 up to $50, may be a bit high.&nbsp; even then, the passive filter will be minimal.&nbsp; also, there is no easy way to turn up the volume of the subwoofer seperatly, so you are basically hoping the speakers just sound equally loud in the setup.further, due to the commonly inductive load of the speaker, and the probably resonance of the midrange, you may find results are better with a pre-amplifier filter.also, the passive lowpass has a high series resistance, which increases Qtc (sealed boxes) and reduces damping in ported as well.&nbsp; generally undesirable.a 4 channel amp is also great for expanding systems.&nbsp; if, at some later time you decided to buy a dedicated sub amp, you would have a 4channel amp to work with -- the ability to amp 4 speakers in the car (front-rear or biamping).&nbsp; the 4 channel amp also doubles as a powerful 2 channel amp for components.&nbsp; it really is a nice thing to keep around!tri way isn&#039;t discussed because no one uses it.&nbsp; it requires a passive filter at relatively low frequencies, which means large components and high costs, which can only be offset by making the crudest crossover possible.&nbsp; level matching is also not a feature, and the woofer needs to be 8ohm or higher.</blockquote>

[QUOTE="thch, post: 2222566, member: 562032"] depending on the frequencies and power in question, you might find that the inductor+capacitor costs, probably around $30 up to $50, may be a bit high. even then, the passive filter will be minimal. also, there is no easy way to turn up the volume of the subwoofer seperatly, so you are basically hoping the speakers just sound equally loud in the setup. further, due to the commonly inductive load of the speaker, and the probably resonance of the midrange, you may find results are better with a pre-amplifier filter. also, the passive lowpass has a high series resistance, which increases Qtc (sealed boxes) and reduces damping in ported as well. generally undesirable. a 4 channel amp is also great for expanding systems. if, at some later time you decided to buy a dedicated sub amp, you would have a 4channel amp to work with -- the ability to amp 4 speakers in the car (front-rear or biamping). the 4 channel amp also doubles as a powerful 2 channel amp for components. it really is a nice thing to keep around! tri way isn't discussed because no one uses it. it requires a passive filter at relatively low frequencies, which means large components and high costs, which can only be offset by making the crudest crossover possible. level matching is also not a feature, and the woofer needs to be 8ohm or higher. [/QUOTE]

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