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In Reply to: RE: SET active versus passive biamplification posted by iodemus on July 05, 2011 at 01:46:58
You will find many opinions on this question. My best advice is to seek the specific experience behind the opinion and ignore the conclusions drawn from that experience - draw your own conclusions if you must. In too many cases you can't get back to the experience by itself, which is unfortunate but completely human. Theory is close to useless, except to provide a comfortable reason to believe you own prejudices. I say that even though I am a theoretician myself ... :^)
My experience has been that high order line level crossovers sound better than passive speaker level crossovers, and that low-order speaker level crossovers sound better than high order ones. I have little direct experience with low order line level crossovers.
For what it's worth, active crossovers are usually feedback circuits, not simple gain stages following a passive network. Since one of the virtues of SETs is their lack of feedback, I am suspicious of active circuits - but as I said, that's theory and therefor nearly useless.
Incidentally, danlaudionut says "Caps are bad but inductors are lethal." There are others who say "Caps are bad, inductors are good." I'm not choosing, since I don't have a large enough base of direct personal experience - I'm just reporting the range of opinions I've seen.
Follow Ups:
Paul
I love inductors as plate loads.
I have 10 pieces of iron in my amp.
I have 8 pieces of iron in my DAC/Preamp.
I have 10 pieces of iron in my Phono Stage.
I hate inductors between amps and drivers.
The amps ability to control the driver is
seriously impeded by the inductor.
Tube amps especially are handicapped
because of their low DF.
DanL
Not if mid bass is 24ohm and 106db 1 watt then inductor is the best way. This all comes down to end design some loudspeakers and systems would do best active some passive. I use simple passive on my designs unless for subbass use then active steep slope. I also gave up biamping from 70hz-25khz on my horn systems if design is proper biamping in this range negatively effects sound quality. But below 70hz or so it doesn't matter to end result and is preferable to running tubes on low bass. So I biamp with active SS on bass horn and run rest simple passive best of both worlds plus I need no level matching.
Steyr
I took a look at your website
to see what you design with...
The Seas W8 X2-08 (above graph)
looks like it could use some
decoupling to tame or dampen
the erratic frequency response.
The Seas X1-04 is not much better.
But a whizzer cone for HF ???
How retro of you 8^D Never heard
a whizzer that satisfied me.
But a Raal Ribbon for HF ...
that's more like it - AWESOME!
And not to mention the Fostex
FW800HS 31.5" woofer - impressive.
Definitely needs to stay away
from 500Hz like most sub drivers.
Your choice in drivers is expensive,
at ~$800 a piece for the Seas
and $3.5K for the sub driver.
And I thought $250 a piece was
alot for a Dynaudio tweeter !!!
I am sure they MUST have something
going for them at that price.
But the "normal" priced drivers that
most of us use would benefit from
bi-amping to get the best out of them.
DanL
These dipoles turned out well. Maybe more your cup of tea. Has another 8in back firing loaded in ported cabinet.
DanL
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