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Old 23rd October 2012, 12:55 AM   #411
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Quote:
Originally Posted by MiiB View Post
Dave, you can just add the lower impedance parallel to the input impedance of your power amps.(not change the amp itself)
I have have even built at three-way like this, where I took the signal over a 20 ohm resistor (serial filter) posing as the basedriver in a system with powered woofer.
You'd need a jolly beefy buffer though to drive 20R at normal line levels. Better to put in an amp (30dB or so) and run well below normal line levels (say 100mV peak). That way the core losses of the inductors don't become so significant at HF. But the optimum level depends rather on the core materials chosen.
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Old 23rd October 2012, 01:03 AM   #412
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Originally Posted by Wavebourn View Post
Then they are active speakers.
No they are passive powered speakers.

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Honestly, I don't like this terminology, even if it is domestic. It is confusing, artificial. Call me anti-patriot, but I prefer international terminology accepted by the outside of the forum world.
The biggest discussion i've seen on this subject was on an australian forum... that is pretty international. I even dug up somesolid references.

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Old 23rd October 2012, 01:05 AM   #413
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Originally Posted by MiiB View Post
Dave, you can just add the lower impedance parallel to the input impedance of your power amps.(not change the amp itself)
My pre-amp wouldn't be too happy with that.

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Old 23rd October 2012, 01:10 AM   #414
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Originally Posted by flavio81 View Post
I guess you have a remarkable amplifier, and a remarkable crossover as well.
The amps are many and not all that special. Tube, Solid State, Classes A, AB and D. I do like my speakers (Altec VOTT A5) and I think I did a nice job on the crossover.

What helped me get over my fascination with active crossovers was to stop listening to the system and start listening to the music. The music comes thru a passive crossover just fine. The illusion remains intact.

Yes, I like a L/R difference with delay in the rear channels, too. It does change the front image, usually for the better. I have an old Yamaha DSP-1 that can generate all sorts of sounds fields in 4 channels from the front 2 channels. What sounds best? The difference channel in the rears speakers, simply enough. Go figure.
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Old 23rd October 2012, 01:51 AM   #415
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Originally Posted by planet10 View Post
No they are passive powered speakers.
I disagree. I would call "passive powered speaker" a speaker with magnetic field coil only. Period. It is powered, but it is passive, since all input energy goes directly to the moving coil, with no amplification.

Speaking of crossovers, the difference between "active" and "passive" may be taken from definition of active and passive filters. And even here difference is very diffused, because a filter that uses passive RLC components between amplification stages that match input and output impedances also may be called active.
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Last edited by Wavebourn; 23rd October 2012 at 01:56 AM.
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Old 23rd October 2012, 05:22 AM   #416
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Dave... my 20 ohms was driven by the amp that drives the mid and the tweeter, then the signal over the resistor was padded down and digitally DSP shaped so it via an 1KW amplifier could drive a subwoofer 4X12" drivers in a carbon cabinet down to 15 Hz.

The result was a rather big semi active speaker with an incredible power and dynamic range, but I must say not as good as my current purely passive big speaker...
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Old 23rd October 2012, 05:33 AM   #417
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Quote:
Originally Posted by planet10 View Post
No they are passive powered speakers.



The biggest discussion i've seen on this subject was on an australian forum... that is pretty international. I even dug up somesolid references.

dave
I must ask Jason
I thought that THIS was an originally australian forum
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Old 23rd October 2012, 06:10 AM   #418
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Jason is from Australia, now living in the Phillipines, server is in USA, mods from US, Canada, UK, Australia, Greece, Phillipines. Retired mods from France, Germany, Belgium, Netherlands, Sweden (and more i'm sure), membership is international.

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Old 23rd October 2012, 06:53 AM   #419
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Quote:
Originally Posted by Wavebourn View Post
I disagree. I would call "passive powered speaker" a speaker with magnetic field coil only.
guys, you are making clear water muddy

active speaker means multiway with active crossover, and simple as that
doesn't mean its got anything built in at all
but if its sold commercially, ofcourse its built in
selling a speaker with drivers only wouldn't make much sense

whether you call it powered or active...doesn't change anything
it will come with amps ofcourse, and I doubt it will have anything other than active filter
powered will ofcourse means built in amps
active speakers for studio or high end could ofcourse be bigger setups where its all seperate units

please don't make it such a mess
it might sound like great fun, but really only looks very foolish
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Old 23rd October 2012, 08:09 AM   #420
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Originally Posted by tinitus View Post
selling a speaker with drivers only wouldn't make much sense
I don't agree, but it's an entirely untapped market. Speakers could be sold with a few extra 4mm sockets and link pieces on the back, allowing the user to select the drivers-only option. Then it would be all systems go for the industry to sell us two or three times as many amplifiers and cables as they do now, plus a field day for the magazines mixing and matching amps, active crossover boxes, line level crossovers, passive crossovers, software - the speakers could come with ready-made cal files for digital crossovers. A new industry in Class A tweeter amps would be born. Mixing solid state and valves between drivers would be possible. The 'high end' would encourage the use of six or eight monoblock amps.

Anyone with passive speakers would begin to feel somewhat inadequate, or at least curious, and would be tempted to buy a system just to see what all the fuss was about.

It would be completely different from standard 'active speakers': a tweaker's paradise.
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