Actually, passive crossovers in speakers are technically not powered, they are designed to pass the power from the amplifier to the speaker. Depending on their design, yes some power can be dissipated within them, but in most cases this is minimal if the inductor wire gauge is kept large enough.

As for active crossovers in the car, it's actually quite easy to do. Most aftermarket amps these days come with built in crossovers, you don't need a separate box (in fact it's getting harder and harder to find them). Even many in dash receivers these days have built in crossovers, sometimes on both the preamp and speaker level outputs.

The passive crossover which really will absorb/dissipate quite a bit of power, would be between a woofer and a subwoofer. The reason for this is simple - passive crossovers at frequencies of 80-120Hz that a typical subwoofer will be cut off, require very large value inductors, which require lots and lots of wire. The resistance adds up quickly with the high value inductors, especially if you use a proper 2nd order (12 db/octave) slope or higher. The crossover between the midrange and the tweeter isn't nearly so demanding, being somewhere between 2-6kHz typically, and so much smaller value inductors are used, with a far lower DC resistance..

Aaron

• Replacing Stock 9K Speakers, Mike, Mon, 7 May 2001 18:44:32
  • Answers to all! :0, Aaron Gilbert, Mon, 7 May 2001 19:24:00
    • Re: Answers to all! :Attn: Aaron - rears out of phase ?, RedAero93, Tue, 8 May 2001 08:25:30
      • How do you reverse the phase..1995 Aero sounds terrible..??, FLM, Tue, 8 May 2001 08:48:07
        • Self Amplified Speakers (longish), David Cocker, Tue, 8 May 2001 10:32:55
          • Re: Self Amplified Speakers (longish), Aaron Gilbert, Tue, 8 May 2001 12:39:08 <-- Viewing This Message
    • self amped speakers....., Chad, Mon, 7 May 2001 21:35:59
      • Not to pick nits (but hey, speakers are my thing, Baby!) .., Aaron Gilbert, Tue, 8 May 2001 00:02:31
        • stock amp in 89 9000s, Bobby, Wed, 25 Aug 2004 09:21:15
        • audio heaven, roadrunner, Tue, 8 May 2001 03:54:11
    • Re: Answers to all! :0, Zievfret, Mon, 7 May 2001 19:47:01
      • Yep, still Supertuner III it is. Actually I like the new Pioneer, Aaron Gilbert, Mon, 7 May 2001 21:11:23
        • Which would you choose?, Saabgirl, Tue, 8 May 2001 11:11:03
        • Which would you choose?, Saabgirl, Tue, 8 May 2001 11:06:11
          • Definitely the OXD402., Aaron Gilbert, Tue, 8 May 2001 12:24:00
        • Which would you choose?, Saabgirl, Tue, 8 May 2001 11:02:18
  • Re: Replacing Stock 9K Speakers, Phil, Mon, 7 May 2001 18:55:12
    • Re: Since We're on the Subject of Audio, Zievfret, Mon, 7 May 2001 19:08:39
      • You can use the original ant., VIKINGMAN, Tue, 8 May 2001 17:15:32
        • Thanks Vikingman (n/m), Zievfret, Tue, 8 May 2001 18:39:40
      • go to Crutchfields, Saabgirl, Tue, 8 May 2001 13:30:23
      • go to Crutchfields, Saabgirl, Tue, 8 May 2001 13:24:45
        • Re: Thanks Saabgirl, Zievfret, Tue, 8 May 2001 18:00:29
      • Re: head units - antennas - Speaker City, Julz, Mon, 7 May 2001 19:47:51

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