What I try to contribute here is the lessons that we have learned in hi end audio design that often can be applied to DIY audio. For example, you can spend just as much time and trouble to make a 'poor' design as you might spend with a better one.
I am continuously attacked for giving these ideas here, (for free), as if I was saying something wrong. I can't help it IF not everyone can have highest audio quality for $39.
If I could make a quality loudspeaker cabinet with packing material, or an orange crate, I would gladly do so. Ever try it?
If we consider your post http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-1689.html#post2753775 here,
, you and you associates are targered for deep pockets. And this agenda has nothing to do with DIYI also build products to this standard, and they too, are very, very expensive. Only for millionaires, because they are the only ones who can afford them. Constellation, one company that Demain and I work for as consultants, makes some of the most expensive and exotic amps, preamps, turntables, digital playback, and soon, phono preamps in the world today. It is one area that we have chosen to work in, sort of like the manufacturers of Bentley, or similar vehicles. It is a 'labor of love' as much as an engineering challenge.
Packing material is indeed very good acoustically for building quality loudspeakers, albeit cheap.
Regards
George
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Well, I have tried cheap and available materials to make loudspeaker cabinets, myself. I was not successful. Perhaps our 'standards' are different?
I'm sure some 'here' use components on par with anything
but it really doesn't matter that much
its just what dreams are made of, as you may well know
yeah, its no problem to build stuff here that will compete with anything in the 'hiend' world
or even beat a lot of it
theres only one area where we may not have the skills, or only very few will
and thats the digital domain
John, you really sound like you think we are all just a bunch stupid morons
which is where you are really wrong
but 'our' most genius members live 'quietly', and happy
no fancy titles or anything
just modest people
and you may never notice them at all
but it really doesn't matter that much
its just what dreams are made of, as you may well know
yeah, its no problem to build stuff here that will compete with anything in the 'hiend' world
or even beat a lot of it
theres only one area where we may not have the skills, or only very few will
and thats the digital domain
John, you really sound like you think we are all just a bunch stupid morons
which is where you are really wrong
but 'our' most genius members live 'quietly', and happy
no fancy titles or anything
just modest people
and you may never notice them at all
Perhaps our 'standards' are different?
no doubt 🙂
btw, I believe I have better stereo
do you doubt it ?
but what does it matter
I don't care
and no, I never listen to electronics
I listen to music only
many hours every day
thats my best 'drug', music
and it takes good electronics, yes ofcourse
thats why we are here
Well, I will tell you. It is not 'intelligence' that is noted, but lack of experience with audio quality. When someone tells me that building loudspeaker cabinets of 'world class' can be easily done with scrap materials, then I suspect they don't have any experience with cabinet resonance and its relatively high Q.
I agree on the scrap, but we're just teasing you, John. 😉
However, don't underestimate the DIY crowd. I've seen DIY builds that were as good or better than any commercial high end product. It's easier when you don't have to make a profit or meet deadlines.
However, don't underestimate the DIY crowd. I've seen DIY builds that were as good or better than any commercial high end product. It's easier when you don't have to make a profit or meet deadlines.
Or use stuff that can only be gotten in onesy-twosys. That's a big leg up that a diyer has over the pros.
yeah yeah, money means nothing
just something we have plenty of
hi end, bentleys, whatever
what's that got to do with diy people
Money is in short supply as compared to our ambitions for the most of us. So you have these people out there like John, Charles, Nelson, who are clever enough to have found a way to produce gear for the 1%; no holds barred gear. That is the Petri dish where evolution is taking place.
And they are kind enough to share much of their insights with the DIY community. So, it has everything to go with DIY people, and those who are willing to learn are counting their blessings, right now, at this very moment.
All of the above with the mandatory caveat to question authority and think for yourself.
vac
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Actually you brought up an interesting subject, Pano. Perhaps this 'scrap wood' has some advantages over other scrap lumber. Much like boat 'hatches' make good restaurant tables. However, we get all kinds of inputs here, some in fun, some from ignorance, and I sometimes can't tell the difference.
With Nelson, Charles, and me, it is our '10,000 hours+' of dedication to making the best audio that we can, over decades, that is what makes us 'successful'.
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I worked on a Scully R2R for a time. Really loved that beast. It was the mechanics I liked best as it was the editing machine. A real work of art, that transport.
Agreed a beautiful transport and wonderful for editing. Last I looked most of the now 45 year old machines still in working condition!
What is your choice now, tube or transistor amplifiers.
Agree that sometimes the sound of transistor wasn't that good - in the days of Germanium types. But for designers of FM tuners the transistor was a revelation. And another thing is true, transistor amps - regardless of single ended or push-pull - have the better bass reproduction.
The low frequency response is limited by the output transformers. I prefer the rebuilt vacuum tube version. All the passive parts brought up to modern quality parts and a slightly modified power supply. It is not really possible to do that with the solid state version more changes would be needed as the circuit topography is not as far advanced as the tube version. Transistors were new and not yet exploited to full advantage!
Just got back from the NY AES show. I never get this show thing right. I gave copies of Linear Audio Vol. 1 to several manufacturers! It seems at least one of the reputable test equipment manufacturers likes my method of testing resistors as that is an issue they have been looking into. Then there was a resistor manufacturer at the show who also is interested in looking at the application to QC and R&D. Remains to see if it was polite smoke or better parts will emerge.
But more importantly other than the quick lunch at the show, the dinners were great, but I actually had to pay myself! Non of the major manufacturers go to the show anymore except JBL was there and didn't buy! I'll have to cancel my pending order!
John, Mark Gander says Hi!
Oh and just to get the complaints rolling Bose now has a real series of professional loudspeakers for mid size to large rooms. I think I may try them out in a church or two!
The low frequency response is limited by the output transformers. I prefer the rebuilt vacuum tube version. All the passive parts brought up to modern quality parts and a slightly modified power supply. It is not really possible to do that with the solid state version more changes would be needed as the circuit topography is not as far advanced as the tube version. Transistors were new and not yet exploited to full advantage!
Just got back from the NY AES show. I never get this show thing right. I gave copies of Linear Audio Vol. 1 to several manufacturers! It seems at least one of the reputable test equipment manufacturers likes my method of testing resistors as that is an issue they have been looking into. Then there was a resistor manufacturer at the show who also is interested in looking at the application to QC and R&D. Remains to see if it was polite smoke or better parts will emerge.
But more importantly other than the quick lunch at the show, the dinners were great, but I actually had to pay myself! Non of the major manufacturers go to the show anymore except JBL was there and didn't buy! I'll have to cancel my pending order!
John, Mark Gander says Hi!
Oh and just to get the complaints rolling Bose now has a real series of professional loudspeakers for mid size to large rooms. I think I may try them out in a church or two!
Even in transformer design we are not at the end ... regarding that we will see ...
Mr. Curl.
No doubt that our standards are different.
I am not questioning your “10,000 hours+' of dedication” or your success in the audio business. You’ve earned them both.
It is just that Mr.Nelson Pass whom you are quoting, does not pursue here the mantra of high priced components. He could, he may know that on occasion this might be true, but he keeps a sense of reality (diy site) and insists on communicating with people for the fun of the achievement. He too designs, builds and sells expensive top notch products for a living .
“world class” product, is a marketing term.
(That’s what I am objecting. The marketing attitude used in a diy site ).
Regards
George
No doubt that our standards are different.
I am not questioning your “10,000 hours+' of dedication” or your success in the audio business. You’ve earned them both.
It is just that Mr.Nelson Pass whom you are quoting, does not pursue here the mantra of high priced components. He could, he may know that on occasion this might be true, but he keeps a sense of reality (diy site) and insists on communicating with people for the fun of the achievement. He too designs, builds and sells expensive top notch products for a living .
“world class” product, is a marketing term.
(That’s what I am objecting. The marketing attitude used in a diy site ).
Regards
George
IMO there is a lot of great High End Audio products in the market. They are certainly not restricted only to Hansen, Pass and Curl designs. This thread of course contains enough marketing claims, but it is possible to filter it and get useful information.
I, for one, sincerely appreciate your comments here, John.
Shortly after I started reading diyAudio, I found myself using copy+paste to save away some of the more useful tidbits of information to a text file where I could find them them more easily and quickly. Looking at the file today, 99% of the gems are attributed to John Curl. You should write a few articles like Nelson Pass, or a book like Bob Cordell, or several books like Douglas Self (my apologies if you're already writing papers and books and I just was not aware).
Shortly after I started reading diyAudio, I found myself using copy+paste to save away some of the more useful tidbits of information to a text file where I could find them them more easily and quickly. Looking at the file today, 99% of the gems are attributed to John Curl. You should write a few articles like Nelson Pass, or a book like Bob Cordell, or several books like Douglas Self (my apologies if you're already writing papers and books and I just was not aware).
Rust free?
Well I just tried looking for a buzzer. You know one of those old fashioned coils that when energizer pulled open the circuit feeding them to make a nice buzzing noise. The only ones I found were expensive (>$20!) and in sealed metal cans. Virtually everything sold as a buzzer is a piezo type of noise maker.
So I had to cheat and wire a relay to buzz for me.
Now who cares to guess why I would want a buzzer other than to make a sound?
So I had to cheat and wire a relay to buzz for me.
Now who cares to guess why I would want a buzzer other than to make a sound?
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Nice source of EMI/RFI.
You win the prize! Please send me your credit card number so we can ship it to you.
So I have three hobby projects on deck. One testing my macrame power cord, the second an article on linear power supply design tips, and a third on hidden common base/grounded grid amplifiers.
So do you want to keep playing the game and tell me why a noise source would be enlightening for an article on hidden amplifiers?
Clever!So I had to cheat and wire a relay to buzz for me.

Ignition coils and spark plugs also make excellent noise sources, as we all know. Be careful if driving one with a solid state switch, I've seen the big coils kick back as much as 200V on the primary.
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