Pl8er
Yup. Just think, for example, of an amplifier that has a high pass filter on it. When you hook that up to your components and turn on the filter, it will block out certain lower frequencies from even reaching the component's own crossover. In fact this is how I set up my own system.
You can...but you're going to get some strange results soundwise if you double highpass or double lowpass something...
helotaxi
5,000+ posts
Kilroy was Here
What exactly do you mean? You can't just add an electronic crossover to your stereo amp and expect it to do anything to the passively crossed over comps other than using it to block out the lower frequencies from the midrange. If you don't like the job that the passive crossover is doing of dividing the freqs between the mid and tweet, you will have to get rid of the passive crossover and add another two channels of amplification for an active crossover to have any effect.
Well you could block out higher frequencies to the tweets with a bandpass filter.
What you can't do is increase woofer max frequency, or lower tweeter min frequency (besides cut it off completely) because those are already defined by the component's crossover.
Great - as long as you can't tell, it works great for you. Just keep in mind if you put 2 12db lowpass or highpass crossovers on top of eachother slightly offset, your rolloff is totally changed
Well I admit my components aren't the greatest. But I can't really tell any difference when switching on and off my amps high pass filter, except for the fact it cuts out the lower frequencies. The tweet is effectively double high passed but nothing strange that I've noticed. What should I actually be listening for?
That's all it would do...the problem is that unless you use the same centerpoint and slope, you'll end up with overlaps... you won't get a nice, constant roll-off to the sound like you would with a single crossover. It's not like one crossover overrides the other; they are additive in nature. Wherever they overlap you'll get combined effects from both. If you like how the end result sounds, then that's all that matters. Personally, i would just unhook the passive and go active if that's what i thought was needed. I ran my components with double x-overs for a few days when i first got them and was very happy with the results when i stopped.
helotaxi
5,000+ posts
Kilroy was Here
He's not biamping. The two of you are talking about two totally different things.
I'm confused; i hadn't seen any mention of biamping at all. I'm talking about crossing over a signal at the deck or amp level and then having a passive x-over after that that does the same thing (or close) as the active does, over again... which is what the original poster described i think. For example, he might have a passive installed w/ a 12db slope highpass @ 2.5khz. I think he wanted to add an active x-over before the passive with...say a 6db slope lowpass 2khz..then, you have a very weird roll-off curve as a result. It'd be like trying to EQ your system with crossovers. The only crossover that i'd want to add on top of a passive is a high-pass, around 80hz - 100hz, to keep the woofer from playing too low.... 80hz-100hz, where it doesn't overlap the passive's x-overs @ 2.5khz at all.
helotaxi
5,000+ posts
Kilroy was Here
It sounds to me like you have no idea what a passive crossover in a comp set does. A two-way crossover set for a comp set takes an effectively full range signal and sends the high freqs to the tweet and the low freqs to the mid. Since the same basic signal is feeding both speakers, anything you do to the signal before the amp affects both speakers. If you were to put a 2kHz low pass active crossover inline with amp running the comp set, you have now effectively removed the tweeter fomr the equation because it is being rolled off above 2kHz as well. You can't do anything with the active crossover that don't want to affect both drivers. You can high pass the set to keep the low bass out of the mids or you COULD low pass the set at a high freq to limit the range of the tweets on the top end (though it don't know why you'd want to). But if you try to do anything in the middle of the frequency range of the set it won't so much mess up the slope of the passive as it will totally thrash the whole setup. The slope of the passive crossover would be the least of your concern.
I know it would effect the entire setup, sorry if i wasn't clear in that. He could put a low-pass and low slope (6db) active crossover @ something above 3khz and might think it sounded 'better', which was what i envisioned him doing. As you said, it'd be a totally ****ed response curve, which is what i've been saying.
for some clarity:
OP is pl8er. he has only the first post and has not yet replied to the other posts.
after that, people have started a kinda side topic on combining filters.
while this is a good topic (and has been discussed in other threads), it isn't the original topic, which was a question to the simplicity of using an active filter in conjunction with a passive filter.
the answer to that question is no, it is not a simple matter. the passive filters should provide sufficient blending of the mid+tweeter. if not, the filters need to be redesigned, or bi-amplification (which requires more amplifers) must be used.
for simple, maybe the speakers could be moved to more favorable positions. further, you may find an advantage in wiring the tweeters backwards.
that said, it is a different matter to speak of using the active filters on amplifiers to blend the component set and subwoofer. this is very common and is a good idea, assuming you want to blend the mid and sub.
if the mid and tweeter don't blend together or have tonal issues, you might try an equalizer to help out a bit.
OP is pl8er. he has only the first post and has not yet replied to the other posts.
after that, people have started a kinda side topic on combining filters.
while this is a good topic (and has been discussed in other threads), it isn't the original topic, which was a question to the simplicity of using an active filter in conjunction with a passive filter.
the answer to that question is no, it is not a simple matter. the passive filters should provide sufficient blending of the mid+tweeter. if not, the filters need to be redesigned, or bi-amplification (which requires more amplifers) must be used.
for simple, maybe the speakers could be moved to more favorable positions. further, you may find an advantage in wiring the tweeters backwards.
that said, it is a different matter to speak of using the active filters on amplifiers to blend the component set and subwoofer. this is very common and is a good idea, assuming you want to blend the mid and sub.
if the mid and tweeter don't blend together or have tonal issues, you might try an equalizer to help out a bit.
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