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In Reply to: RE: Choose a Low Pass posted by Mr_Steady on July 05, 2015 at 06:35:20
Assuming both drivers have acceptable response over the region in question, I'd first want to figure out whether the midbass driver will be overstressed in this application with the lower crossover points.
Assuming that's not an issue, I'd next want to look at the response curves of both drivers (including off-axis if they are directional at these frequencies) and see if their response curves are "telling us" where they want to be crossed over.
If there is no clear indication from the curves, then I'd look at what is the most practical to implement. The phrase "most practical to implement" covers a lot of territory, and I'd want to take as much into account as possible before choosing the crossover point.
If this were my project, I'd want to start out by asking the question, "what's the best way to meet goals xyz?", and from there let the logical design choices dictate where my crossover(s) should be as the design process unfolds. And I would want to take everything into account; overlooking one little thing (like the phase angle of the impedance curve) can screw up an otherwise promising design. It might turn out that a second-order lowpass at 120 Hz on the woofer combined with an underdamped third-order highpass at 180 Hz on the midbass is what works best, but we won't know that far enough in advance to choose the crossover points beforehand.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Follow Ups:
I agree with everything you just said.
> "It might turn out that a second-order lowpass at 120 Hz on the woofer combined with an underdamped third-order highpass at 180 Hz on the midbass is what works best, but we won't know that far enough in advance to choose the crossover points beforehand."
That's finesse. There is an art and a science in what you suggest. I certainly respect the people who have that kind of knowledge base.
However choosing basic crossover points doesn't seem that difficult. Using all the considerations you listed below to be sure. I just ham-fist it with a 24db Butterworth slope at the point I want. That's the good thing about active crossovers. A fourth order BW sounds as good as most anything else. Maybe you could do better. Even though this is all just conjecture, I bet Tom's simulations will be pretty close to the actual result. It's just will it sound good?
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Big speakers and little amps blew my mind!
I never approach a design with a crossover point in mind, but I always approach a design with the off-axis response and system dynamic capabilities and overall synergy very much in mind. The specific high-pass and low-pass transfer functions (what the filters do to the signal) are simply means to an end, in my opinion.You asked: "I bet Tom's simulations will be pretty close to the actual result. It's just will it sound good?"
No, it will not sound good, it will sound SUPERB, because Tom is a superb designer.
Designing crossovers is pretty easy. Designing really good ones is what's hard.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Edits: 07/05/15
Since we are on the subject of simulations.
I would be very surprised if even Tom Danley has a mathematical model that could simulate the internal reflections generated within a given acoustic horn.
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Big speakers and little amps blew my mind!
> You asked: "I bet Tom's simulations will be pretty close to the actual result. It's just will it sound good?"
No, it will not sound good, it will sound SUPERB, because Tom is a superb designer." <
I really meant to say, very close to the actual results. Possibly even spot-on.
To my knowledge no one has ever made a wide range acoustic horn sound good. Audiophile good. PA good is different. It would be quite a trick. I think if anybody could do it Tom Danley could. We'll see.
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Big speakers and little amps blew my mind!
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