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Something I don't know but would like to find out (question)

Old 10-30-2006, 10:12 AM
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Something I don't know but would like to find out (question)

I was just thinking about component systems... There are 2 speakers per side. take my DLS UP6 for example.

Here are the specs http://www.dls.se/pdf/specup6a.pdf

The woofer is 150wrms at 4ohm and the tweeter is 50wrms at 4ohm.

When I hook these up in the way they're supposed to be hooked up using the passive crossovers what resistance does my amp see? How do they run through the crossover? In parallel or series? Or am I completely off here?

Isn't it the same concept as a DVC sub or 2 SVCs? if you have two 4 ohm speakers or voice coils for that matter Parallel will give you 2ohm load and series will give 8ohm.

Can someone explain?
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Old 10-30-2006, 10:49 AM
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Technically they are in parrallel.. and it really depends on the allignment, but for all intents and purposes the amp sees 4ohms nominal (not 2ohms...)

frequencies making it into the woofer can't make it into the tweeter and vica versa....
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Old 10-30-2006, 10:55 AM
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Originally Posted by Haunz
frequencies making it into the woofer can't make it into the tweeter and vica versa....
this I know
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Old 10-30-2006, 12:27 PM
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I think you question should be: what nominal impedance does my amplifyer see: 2 or 4 ohms?
The answer to that is 4 ohms.
below the crossover frequency the capacitor in series with the tweeter makes it look like a very high impedance.
Above the crossover frequency, the inductor in series with the woofer makes it look like a very high impendance.

The other question you may want to ask is:
What impedance does my amp actually see?
The answer is: It varies with frequency and will probably be less than 4 ohms at some frequency, and much much higher at the high tweeter frequencies...
The actuall impedance will depend on the drivers and the crossover design. This is a complex issue.

there is a good discussion of this at
http://sound.westhost.com/biamp-vs-passive.htm
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Old 10-30-2006, 11:29 PM
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occasionally in magazine articles and detailed reviews you will see a graph showing the impedance across a frequency range.
generally, better quality component sets will show a very flat graph, hovering at or very near 4 Ohms.
this is due to the reasons explained above, and it really shows the attention to detail and design that was put into the crossovers.
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