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In Reply to: RE: Matching amps to speaker efficiency posted by M3 lover on October 07, 2020 at 09:43:57
"1st order crossover was very complex"
I guess I don't know much about crossovers. My 1st order crossovers consist of one coil for the woofer and one cap for the tweeter with a series resistor to match the tweeter's efficiency to that of the woofer. Anything but complex.
I totally agree with bare. "Complex Crossovers can and do Suck the power."
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Hey Tre',
The Duntech Princess has been unavailable in the US for years now and didn't sell in big numbers when it was. So not likely many Inmates are familiar with them.
It was a 5-driver, 3-way design in a very large sealed cabinet. It followed the D'Apolito array design. John Dunlavy favored time/phase coherent designs.
The Princess crossover PC board was mounted on sliders and could be accessed from a panel on the back of the cabinet. An audio buddy with pretty deep electronics experience brought over a 30 or 40 watt stereo tube amp he'd built to audition on my speakers. He suspected that should be adequate for a 90-91 dB speaker. His amp fell flat, it was lifeless in driving the speakers. So he ask about the crossover design. I didn't know enough to explain it so I opened the back to show him the board. When he saw the crossover he joked that if it had a transformer added it should be able to power the speakers. Sorry I don't have a photo to share.
"The only cats worth anything are the cats who take chances. Sometimes I play things I never heard myself." Thelonious Monk
Almost no drivers are really flat. More complex crossovers are never pure 2nd or 4th order but also include equalization to flatten the response. This can be done if there are enough parts to do both equalization and crossover.
On a pure 1st order crossover there are only enough parts to do both jobs, only the crossover portion. So many designers first equalize the drivers to flat and then apply the simple first order crossover. And you end up with zillions of parts for what began as a simple problem.
If you do a simple 1st order electrical crossover, due to driver problems and interaction you probably don't end up with a 1st order acoustical crossover which is what you want. And you probably end up with crazy stuff at the extremes of the crossover/speaker becaus it doesn't roll off fast enough to go low enough inlevel where a driver really goes crazy. But you do get a simpler load on your amp which probably makes it work more easily.
1st order crossover was very complex"
I had the same though. Nothing simpler than a First Order unless the Woofer is allowed to roll off without a coil.
Many parts smells like a L-R 4th Order.
Emoji's: a visual aid for those who need to be drawn a picture
My only other thought was maybe the drivers have server FR problems and there is an attempt in the crossover to fix that? That would make even a 1st order crossover complex.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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