John Curl's Blowtorch preamplifier part II

[fas42]

Originally Posted by Rick Miller

After the demo, and everyone told hm how good his speakers sounded, he pulled back the screen to show that the source was an Apple MP3 player. He said that this was to show that the speakers were the most important part of a system. Do you think that this is because he sells speakers? :^)

What it did show of course, was that extremely straightforward electronics will do an excellent job of reproducing sound if there is nothing silly around handicapping that process. That "speakers were the most important part" is a nonsense, naturally -- the most "important part" was eliminating all the usual flaws in the setup, that is, efforts were made to optimise the demo environment ...

Frank

[Rick Miller]

Originally Posted by gpapag

If I was taught something from my endevours here
PSU RC multistage filtering

is that it’s not the load that makes “so much noise”. But I’ll wait for your proof.

George

George, what do you think of using resistors in the - lead, along with the ones in the + lead to form a "ladder" type RC network?

[simon7000]

Yes George I got your joke. But the noobs did get attention paid to how simple a circuit can be and still produce decent sound quality.

As to the RC filtering, there are several issues here. One is delivering clean power to the circuit. Another is to keep the noise from going back into the AC line. This can be done with filtering or something that is similar to filtering but prevents the noise from starting in the first place!

I normally limit myself to tutorials and just try to illustrate the examples and be complete. In this case there are methods based on very old circuits that should prove to be useful.

[john curl]

I just watched on TV how they make Aston Martins and Rolls Royces. Now there is effort, much like we do in hi end. '-)

[PMA]

Originally Posted by Rick Miller

I have read that Dave Wilson of Wilson Audio gave a demo at the CES one year and only had his speakers in view, all the electronics were behind a screen. He told everyone that the source was a tube based CD player. After the demo, and everyone told hm how good his speakers sounded, he pulled back the screen to show that the source was an Apple MP3 player. He said that this was to show that the speakers were the most important part of a system. Do you think that this is because he sells speakers? :^)

And of course no direct comparison with cd done at the moment. Just marketing and fooling stupid crowds.

[gpapag]

Do you experience delays on page loading especially today?
I do and I reported it here
Malicious URL on diyaudio website? [RESOLVED]

George

[PMA]

I have seen the same several times with Opera browser on this site.

[gpapag]

From 08:45 (Greenwich time), access and page opening runs much faster.

George

[john curl]

I have visited Dave Wilson demonstrations that were 'painful' to listen to. I have also heard 'wonderful' Dave Wilson demonstrations at CES. I don't go out of my way, anymore, to listen to them, unless someone tells me that they are doing an exceptional demo, rather than a typical one. Dave has become 'jaded' in his later years, and while I love my WATT's and several generations following them, I am disappointed in some of the latest offerings. Too much money, too little everything else. I don't know why.

[Esperado]

Originally Posted by john curl

I have visited Dave Wilson demonstrations that were 'painful' to listen to.

Did he forgot to "voice" them, or did he lose his rare talent to make believe fairy tales ?

His encolusres cannot be top for several reasons IMHO.
The d'Apolito's medium configuration is a nice try to solve vertical phase problems at Xover, but does not work optimal in real world.
First, I never reached 2 paralleled speakers to sound as good as a single one, specially in mediums. Both on an electrical point of view, if they are plugged on the same power amp, and acoustical. The vertical accidents due to phases mismatches on all their range are worse than the group delay they try to cure at crossover.
The radiated diameter between the mediums and the tweter are too different. No directivity coherence in possible.
Because the tweeter is very small diameter, i presume the Xover is done at high frequency ?
I never heard a good homogeneity with tweeters crossed upper from 2 Khz, because acoustic phase problems. Listening will be tiring.
The inverted dome (did-he buy them at Focal ?) for tweeters are just awful and a offense to acoustic intelligence. Focal's tweeters ( they made-it just to be original) are the worse tweeters i had tried, they just play some kind of distorted high frequency noise, very nasal.

On the positive side, i believe the enclosure to be rigid and heavy, and let the customer to chose the vent's position between front and back of the enclosure is clever.

As far as i'm concerned, i would not buy them, even at 1/10 of their (outrageous) price.