Fedex Delivers early birthday present

[redcalimp5 10+ year member]

ive never done it but i understand the concept and really dont think i would have any problems with it... but do you really think it would be worth going active with almost half the power?

Yeah, I do think it'd be worth it. Passive crossovers tend to drench out 'actual' power going to your mids and tweets....so even if you're giving them 250w a side passive, I don't think they're getting the full power load. Someone who knows

 

[Etac 10+ year member]

yea i heard that too - someone told me approx 15% but then i was told that was wrong and more like 5% /shrug

 

[redcalimp5 10+ year member]

Yeah, it'd be nice if someone on the boards that know more about that specifically could chime in on this thread about it.

 

[DejaWiz 5,000+ posts]

Yeah, I do think it'd be worth it. Passive crossovers tend to drench out 'actual' power going to your mids and tweets....so even if you're giving them 250w a side passive, I don't think they're getting the full power load. Someone who knows

QFT.

The crossover will turn electrical energy into heat since they themselves are electrical components, thus the amount of power the speakers are really getting will be less than what is supplied from the amp. The crossovers can furthermore lower the power even more if there are protection circuits in place.

 

[redcalimp5 10+ year member]

QFT.
The crossover will turn electrical energy into heat since they themselves are electrical components, thus the amount of power the speakers are really getting will be less than what is supplied from the amp. The crossovers can furthermore lower the power even more if there are protection circuits in place.

That clarifies a little better. Thanks meng!

 

[Etac 10+ year member]

makes sense but assume there is no protection circuit.. how much do you think is actually lost to heat on a quality crossover?

 

[redcalimp5 10+ year member]

Found this that relates to what we're talking about.....

"One common myth pertaining to passive crossovers is that they "soak up" the power that is not used for each particular driver. While there is some insertion loss, the filtering action actually takes place due to the impedance mismatch created by the network. For example, if we place a capacitor in series with a 4 ohm tweeter, we have created a first order (6 dB/octave) high pass filter. As frequency goes down, the capacitive reactance of the capacitor goes up. At the crossover point, the impedance presented by the capacitor will be equal to the impedance of the tweeter. Since the capacitor is in series with the tweeter, the effective load impedance "seen" by the amplifier is 4 + 4 or 8 ohms. This rise in load impedance causes a 3 dB reduction in output power at the amplifier. As the frequency continues to go down, the effective impedance of the network continues to rise and the output of the amplifier continues to be reduced at a rate determined by the slope of the crossover. In our example, the rolloff rate would occur at 6 dB/octave because it is a first order network."

http://www.termpro.com/articles/xover.html

 

[DejaWiz 5,000+ posts]

makes sense but assume there is no protection circuit.. how much do you think is actually lost to heat on a quality crossover?

Another thing: A passive crossover will always add impedance that will effect the amp. Running active takes that away.

Here's a good read. And here's another one.

 

[jmanpc 5,000+ posts]

Rainbow FTL.

 

[redcalimp5 10+ year member]

Rainbow FTL.


Thanks for the valuable input on the topic at hand. //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[Etac 10+ year member]

Rainbow FTL.


lol this comes from someone running lightning audio.. and mb... with over 10k post

obviously you have no taste =)