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Of course! Never missed it, I confess to have managed to accumulate most of the known episodes (73/91 IIRC).
But do you remember the audiophile episode? The fearless captain braved a typhoon to bring some reclusive fellow a new generator so he could listen to his LP's. There was the usual story involving a wife to spice it up.
Well I hadn’t looked at Joe’s site. I am impressed.
Joe, you have put a lot of work in there. Congratulations!
So, you know very well how to measure impedances and such.
I am sorry that I gave you those suggestions. I just had the wrong impression that you are seeking some answers.
Now all these that you are asking here can be found on your site.
So, my understanding is that you are not asking for to get an answer.
And I see you do have a lot of space in this site for to educate members with the theory and implementation that you think is optimum.
The "Elsinore Project" Thread
Joe Rasmussen Usher S520 "Current Compatible" Crossover
Joe Rasmussen "Trans-Amp" - 40 Watt Transconductance "Current Amplifier"
So back to basics for us the rest.
George
Thanks George, it's easy to forget we have all been here before. The ghost of SY lives. Did the crossover "noise" issue ever get resolved?
That is exactly my point of view.
Well, the first benefits I can see of the use of horns and compression drivers are their high efficiency, and the ability they give-us to work in "piston" (Ie not fractionate) in the most sensitive and critical frequency range (around 300Hz, where our ears show a peak of sensitivity, according to the studies of Fletcher and Munson). A 23 driver can run easily from 700 to, let say, 15000.
The second one is their directivity remains (with well designed horns or wave guides)) more or less constant all over this frequency range. Means the acoustic power will remain constant, and less modified by the room's reflections.
The last (but not least) interesting thing is that the diameter of the source (at 700 Hz) can be fixed more or less equal to the one of the bass driver. This means the same kind of directivity curve for the both transducers at the crossover frequency. Everybody can understand the benefit.
What about the upper range (between 15000 and 25000) ? I don't know if it is due to my age, but I did not miss nothing, and each attempt I made in my life to add a "super tweeter" was just like adding distortion and unnatural treeble). Just like this, in my system, everything (mainly drums) sound so near to real.
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I suggest to everyone that rather than carry on here go to George's second link and read it from the beginning or start at the end and go backwards. Heraclitus could not have been more right. No need to close another thread.
By current standards automatically opening doors at the grocery store are AI... the term gets thrown around like it's worth gold itself.
I've chatted with Joe before, and when he isn't being as defensive the convo is good. But in this case I'm really not sure, just like you, what exactly Joe has for goals now. That's why I suggested that if we don't want current drive amps, then what else are we going to do besides use big *** series resistors in speakers to get some kind of medium between voltage/current from the amp?
I have been, and I'm still not sure what you're saying except current is important, but you don't support current drive. And the thing is I know you know a bunch about all of this stuff... I'm probably not the only one wanting to pay enough attention to learn something more than how far you're willing discuss whether or not you support current drive.
It would be interesting to hear their explanation how the op-amp based (4558/5532 variety) Accuphase F-25 crossover fits their 4 way DHT concept.
And that computer without the lid and its PSU a feet or so away from the audio gear surely isn't emitting anything.
[party pooper mode OFF]
😀
The last thread closed quickly after it was clear that the concept of Norton/Thevenin equivalents was not understood (at all).
@Carlos & Scott
Ok thanks. I'm going to assume there is nothing to see here (at the moment) and move along.
Ok thanks. I'm going to assume there is nothing to see here (at the moment) and move along.
When the old Star Trek TV show was made, the doors on the Enterprise had to be worked by stagehands. Mishaps hap'ed.
My article to lower speaker's THD was in TAA 3, 1985.
The results from a VFA power amp with a moderate amount of NFB was modified as I described and the THD near resonance was much lower from the speaker.
View attachment TAA2.pdf
View attachment TAA 5.pdf
PS.... I did not try to see how low the THD could be made to attain.... and a high NFB amp might be better for this app. It was just to test the concept.
So, is it current or voltage that matters? 🙂
THx-RNMarsh
Limited file size here doesnt allow for the whole article to be shown.
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George, are we not all similar participants? And for free too! I would listen to anybody that can broaden my view, why limit that? Jørn Utzon drew inspiration from a person in his office peeling an orange. Know the story?
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