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how many watts are speakers getting ?

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Topic review
   

Expand view Topic review: how many watts are speakers getting ?

by Dragon_fire » Sat May 14, 2005 7:45 am

that makes sense now. Thank you all for very thorough yet simple responses =).

by William from NOLA » Fri May 13, 2005 11:01 pm

Ahh I get it now :)

by GlassWolf » Fri May 13, 2005 8:41 pm

with separates, the amplifier sees the load of the individual speaker at the frequency range that speaker covers. Different speakers with different loads will mean the amp will see different loads at different frequency ranges.

Consider my '94 Jeep that ran the single 2125SX amp (2 channel) for front separates, rear coaxials, and two subs. Same situation but a bit more involved. same result though. different loads at different ranges at the same time.

by Fishy » Fri May 13, 2005 7:18 pm

the lowest ohm speaker used is the load shown to the amp?

Disregarding losses in a passive network if you have a 4 ohm mid crosssed over below 3kHz and an 8 ohm tweet crossed over above that then at frequnecies below 3kHz the amp sees a 4 ohm load and above 3kHz sees 8 ohms. At frequencies at or around the crossover point strange things begin to happen as both drivers are playing at the same frequencies. However the amp may actually see about the same impedance due to the added impedance the caps and coils provide around the cutoff frequency or frequencies.

-Fishy

by Fishy » Fri May 13, 2005 7:05 pm

Yeah my B&W's employ 8 ohm mids and 4 ohm tweets. Its usually the other way around.

-Fishy

by William from NOLA » Fri May 13, 2005 6:50 pm

Ahh, I've wondered about crossovers and how the speakers are "shown" to the amp. I assumed that having two 4 ohm drivers in a crossover are in a sense, wired in parallel. So what you are saying, in effect, the lowest ohm speaker used is the load shown to the amp?

by GlassWolf » Fri May 13, 2005 6:46 pm

actually I see a number of separates using 4 ohm mids and 8 ohm tweeters. my point was simply that using two drivers in "parallel" only affects final load when both are producing the same freq range. a tweeter and midrange with proper crossover won't be doing that, so the load will be that of each driver individually.

by Fishy » Fri May 13, 2005 6:39 pm

lol, beat me to the punch

:)

-Fishy

by Fishy » Fri May 13, 2005 6:38 pm

Actually there'so way to guarantee that each component is getting exactly 150 watts. There are losses in the passive xover, each driver may be of slightly different impedance, and of course a 150w amplifier does not supply 150 watts all the time, but the main reason that all speakers in a component set get about the same amount of power is because they all proivide aproximately the same load to the amplifier(~4 ohms in this case). In other words the amplifier sees about the same impedance at most frequencies those components were intended to play.

I know. Hard to understand and even harder to explain.

Maybe someone else could give it a shot.

-Fishy

by William from NOLA » Fri May 13, 2005 6:36 pm

The only time power will not divide evenly is when the resistors are not all equal.

i.e. You have a 4 ohm and a 2 ohm driver both SVC; the 2 ohm will receive more power than the 4.

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