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Passive sub questions

926 Views 5 Replies 5 Participants Last post by legierk, May 12, 2007

crawdad379

Discussion Starter · May 11, 2007

allright I know alittle about sealed vs. vented enclosures now how bout passive. how would the passive design comare?

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grjohnso

· #2 · May 11, 2007

Passive vs Active is just where the amp is... A passive sub requires an external amp to be powered, and active sub uses a integrated (plate amp) build into the subwoofer enclosure to power it.

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solacedagony

· #3 · May 11, 2007

Quote:
Originally Posted by grjohnso /forum/post/0

Passive vs Active is just where the amp is... A passive sub requires an external amp to be powered, and active sub uses a integrated (plate amp) build into the subwoofer enclosure to power it.

That's wrong. Active and passive are descriptions of the type of CROSSOVER that is being used. A passive crossover is going to use basic passive components such as resistors, caps, coils, etc. Passive crossovers go after the speaker outputs. Electronic crossovers filter in the signal section (after pre amp, before power amp).

I actually thought, based on crawdad's initial posting, that he was talking about passive radiators, not crossovers. In which case, I know nothing.

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grjohnso

· #4 · May 11, 2007

DOh! Right... sorry, it was another one of those "early morning posts" that come out before the coffee is ingested and brain is fully functioning... Please ignore more for here on out.. I'll stick to asking questions in the morning rather than answering them.

...hides head in shame

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Ryan-T

· #5 · May 11, 2007

Actually both you are right (amps & crossovers), But I also think he is referring to passive radiators.

Passives work like ports. You add weight to the passives to adjust the tuning frequency. They work well when you need a small box that the correct port length won't fit into per tuning.

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legierk

· #6 · May 12, 2007

Quote:
Originally Posted by Ryan-T /forum/post/0

Actually both you are right (amps & crossovers), But I also think he is referring to passive radiators.

Passives work like ports. You add weight to the passives to adjust the tuning frequency. They work well when you need a small box that the correct port length won't fit into per tuning.

Good catch Ryan. I was going to jump on this myself.....You are absolutely correct on all points. I've never heard a sub with a radiator called a "passive" before, but I guess there is a first time......

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