Michael
I read somewhere that you use no low pass components on the mid's in some of your Raidho designs. True?
Remlab.. no that is not true... I use coils, but I aim to take the as much inductance out of my mid drivers as possible, to get the desired roll of I add inductance in series.
Inductance in drivers is a major driver of dynamic unlinearity and back EMF.
Driver-inductance is not desired, but kind of hard to avoid, with iron and coil near each other.
Tinitus.... why do you think we designed them ourselves..???
Inductance in drivers is a major driver of dynamic unlinearity and back EMF.
Driver-inductance is not desired, but kind of hard to avoid, with iron and coil near each other.
Tinitus.... why do you think we designed them ourselves..???
I don't know, to make money I guess, or at least I hope you do
I don't know your driver
maybe it's a small planar design, right ?
isnt a planar a planar, and ribbons are ribbons
and works by their 'nature' ?
can they be that different at all ?
how different can they be ?
anyway, in the end, no driver is better than the last man who handles it
haha.. If I wanted to make money I surely would have stayed in other business areas...
We make two types of drivers, one is a light planar tweeter and the others are ceramic coned mid/woofers. /lets not make this a story about drivers, but stay on the course of what passive can do that active Can't do...
We make two types of drivers, one is a light planar tweeter and the others are ceramic coned mid/woofers. /lets not make this a story about drivers, but stay on the course of what passive can do that active Can't do...
I don't know, to make money I guess, or at least I hope you do
I don't know your driver
maybe it's a small planar design, right ?
isnt a planar a planar, and ribbons are ribbons
and works by their 'nature' ?
can they be that different at all ?
how different can they be ?
anyway, in the end, no driver is better than the last man who handles it
http://hifi-unlimited.blogspot.com/2010/04/raidho-comes-to-center-circle-audio.html
Blink High End
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Whole point of crossover is to split current seen by two drivers.
Show me frequency response with a driver's leads reversed to generate null at crossover point for one of your speakers.
Here is how one of my two way speaker's measurements look:
This is display of independent woofer and tweeter raw response measurements, mounted:
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Based on responses, filters for EQ and crossover are made, and woofer and tweeter now measure as:
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This is how speaker measures with both drivers running:
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And this is how the speaker response looks when one of the drivers has leads reversed:
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This is what vector sums are about.
Here is picture of response recording of speaker playing 1kHz square wave:
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And here is picture of response recording of speaker playing 66Hz square wave:
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Here is percussion of drum being struck. It is about 94ms of recording from CD. Top track is recording on CD, lower track is recording of speaker playing CD:
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This is 10ms zoom from above:
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You can't do this with passive crossovers, and you can't do this with analog active crossovers, but once the understanding and methodology is in place, it takes less than an hour to measure, create filters, and test.
Regards,
Andrew
You still haven't successfully managed to explain what passive can do that active cannot. You've managed to point out one feature of a series crossover, but have yet to really explain why this so called 'current sharing' is something that is actually beneficial. Or rather from your explanations it appears that this current sharing is the bit that makes the magic happen and is why series is better then anything else, active or otherwise.
Can you explain your point please to us dumbies? Before that I assume that you confuse means with targets.
There is NOTHING "natural" about audio reproduction!
It is absolutely synthetic in every aspect!
That's the whole point!
James.
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This one is absolutely passive and "natural". I would say, Organic.
An externally hosted image should be here but it was not working when we last tested it.
Audio reproduction is a well designed illusion!
It is capable of creating audio phenomena that could not exist any other way.
Multi-track recordings by a solo artist is only one very simple example.
BTW I have a Victrola as well. Pretty amazing stuff.
Mine came from my great aunt. It was built in 1923 and came with a nice collection of records from about 1905 and on...
It is capable of creating audio phenomena that could not exist any other way.
Multi-track recordings by a solo artist is only one very simple example.
BTW I have a Victrola as well. Pretty amazing stuff.
Mine came from my great aunt. It was built in 1923 and came with a nice collection of records from about 1905 and on...
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I have yet to get my speaker loud enough for long enough that they change sound character audibly.
I've got them loud enough that things fall of of my shelves and verbal communication is all but impossible though.
hello wavebourn
first of all i did not imply anything of the sort you so liberally characterize. i simply meant that you were off topic and probably biased. to the point now. my point was that manufacturers of tube amps, almost invariably, provide their output transformers with taps for different speaker loads. maximum power transfer is the reason. also, zobel networks were devised to counteract for the varying impedance of the speaker and make it appear as a constant resistive load as much as possible. there is a reason for that too, whether the zobel is in the crossover or at the output of the amp. speaker impedances vary greatly and amp design is affected.
first of all i did not imply anything of the sort you so liberally characterize. i simply meant that you were off topic and probably biased. to the point now. my point was that manufacturers of tube amps, almost invariably, provide their output transformers with taps for different speaker loads. maximum power transfer is the reason. also, zobel networks were devised to counteract for the varying impedance of the speaker and make it appear as a constant resistive load as much as possible. there is a reason for that too, whether the zobel is in the crossover or at the output of the amp. speaker impedances vary greatly and amp design is affected.
Maximum power transfer between output stage and Zobel network. No more questions, thank you Sir! You enlightened me finally!
Andrew,
Impressive system you have there, do you use Acourate for XO and EQ or a similar software?
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Assuming that we have locked phase between woofer and tweeter at XO the nulling test (one driver inverted) should be an indicator of the drifting parameters Michael brought into the game. Measuring the notch must show it jumping around vs test level when either mag or phase of any driver has changed. With periodic noise I think this should be doable, allowing the drivers to settle a bit at higher input powers. With two-channel test setup and if the SW can do it, even music could be used when it is broadband and has dense spectra around XO freq.
That'll be an interesting thing to do especially when comparing Michaels (or any) series XO with an standard (2 voltage amps) active emulation of the same transfer functions (with LSPcad this is done very easily).
Andrew
I think you are doing precisely the stuff I am aiming to do: measuring impulse response of each individual driver and thence deconvolving the incoming signal with that response (simply pre-overlaid onto each crossover filter)..?
Are you making the measurements in an anechoic chamber, or is it a whole room correction?
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