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Multi-Way Conventional loudspeakers with crossovers

filterless two-way?
filterless two-way?
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Old 17th May 2012, 06:19 PM   #1
von Ah is offline von Ah  United States
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Default filterless two-way?

This new line of Eminence woofers looks pretty good for very simple two-way applications:
Eminence IMPERO 15A 15" High Power Driver Speaker 8 Ohm 1200 290-692

With the right tweeter (maybe an AMT?), could a filterless two way be actually possible? It would be interesting to see...

Not cheap, of course, but not as pricey as some woofers.
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Old 17th May 2012, 06:27 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Yes, it is possible, but I said in another thread, please, use filters. It not only stops overheating of the moving coil because of loss in the PWM frequencies in the iron parts, they also radiates lots of RF signals and harmonics interfering radio communications. Although I am very far from you, I ask it to you in the name of hams radio. 3.5 and 7 MHz (80 and 40mts band) are currently unusable because of tons of devices generating RF noise.

Thanks.
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Old 17th May 2012, 06:36 PM   #3
von Ah is offline von Ah  United States
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Osvaldo, heh, this is about crossover filters of transducers in the audible band of frequencies. No PWM, no ultrasound, no RF, no infrasound.

Last edited by von Ah; 17th May 2012 at 06:41 PM.
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Old 17th May 2012, 06:40 PM   #4
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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I understand for "filterless" a Class D amplifier without smoothing filter at its output.. Sorry for my mistake.
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Old 17th May 2012, 07:46 PM   #5
AllenB is offline AllenB  Australia
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filterless two-way?
For a filterless tweeter, you might use a piezo. i can't see the benefit though.
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Old 17th May 2012, 07:57 PM   #6
von Ah is offline von Ah  United States
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For pure internet theoretical grand-standing, of course! I think I've read a few threads go on about using a woofer and a tweeter wide-open with symbiotic rolling-off characteristics.
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Old 17th May 2012, 09:28 PM   #7
LafeEric is offline LafeEric  United States
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Also be advised Eminence tests their speakers in what is essentially half space in a semi-anechoic chamber, so the efficiency will have to be adjusted when comparing with other speakers.
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Old 17th May 2012, 10:08 PM   #8
tvrgeek is offline tvrgeek  United States
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Quote:
Originally Posted by von.ah View Post
For pure internet theoretical grand-standing, of course! I think I've read a few threads go on about using a woofer and a tweeter wide-open with symbiotic rolling-off characteristics.
You should read more informed threads. 1: you will blow the tweeters, 2: you will drive the woofer into breakup regions. Either way, it will sound horrid. Even PROPERLY designed single driver systems have passive networks.
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Old 18th May 2012, 03:29 AM   #9
River757 is offline River757  United States
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Not totally filterless, but several companies over the years have sold respected speaker systems with filterless woofers, like EPI and Genesis Physics (click on the "more info" column; includes xover diagrams). These companies had the advantage of designing/building their woofers in-house so their roll-off characteristics could be tailored to a particular system's needs.
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Old 18th May 2012, 04:20 AM   #10
Inductor is online now Inductor  Portugal
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Quote:
Originally Posted by von.ah View Post
For pure internet theoretical grand-standing, of course! I think I've read a few threads go on about using a woofer and a tweeter wide-open with symbiotic rolling-off characteristics.
Maybe referring to Dynaco also. Tweeter has a cap though.
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